EPS-HEP2021 conference

Europe/Berlin
Zoom

Zoom

Johannes Haller (Institut für Experimentalphysik, Universität Hamburg) , Ties Behnke (FLC (Forschung an Lepton Collidern))
Description
The European Physical Society Conference on High Energy Physics (EPS-HEP) is one of the major international conferences that reviews the field every second year since 1971 and is organized by the High Energy and Particle Physics Divison of the European Physical Society. The latest conferences in this series were held in Ghent, Venice, Vienna, Stockholm, Grenoble, Krakow, Manchester, Lisbon, Aachen.
 
The 2021 European Physical Society conference for high energy physics will follow a purely online format. The organisation of the conference is hosted jointly by Universität Hamburg and by the research center DESY. The conference will feature plenary, review and parallel sessions covering all major areas and developments in high energy and particle physics, astroparticle physics, neutrino physics and related areas.
 
Please visit the main conference page for more information. 

Registration

We ask everyone to register for the EPS-HEP2021 conference, if you want to attend any of the sessions. Access to sessions will be possible using a key given to registered participants only. There will be no registration fee.

Abstract Submission

Participants to the conference are invited to submit abstracts for parallel session talks and for posters. Please follow the instructions at Call for Abstracts to submit and manage your abstracts. 

Important Deadlines

Registration  
Opening February 1, 2021
Closing July 12, 2021
Modification deadline July 19, 2021
   
Abstract submission  
Opening February 10, 2021
Closing May 7, 2021
Acceptance notification June 4, 2021
 
 
 
 
 
 
 
 
 
 
 
 

Participants
  • Aashaq Shah
  • Aayush Gautam
  • Aayushi Rajgor
  • Abantika Ghosh
  • Abdel Nasser Tawfik
  • Abdeslam Hoummada
  • Abdullah Nayaz
  • Abhi Modak
  • Abhignya B
  • ABHIJIT PITAMBAR SARODE
  • Abhik Jash
  • Abhisek Saha
  • Abhishek Sharma
  • Adam Coogan
  • Adam Martin
  • Adam Takacs
  • Adil Jueid
  • Aditi Kharat
  • Aditya Parikh
  • Aditya Tamar
  • Adnan Ahmad
  • Adrian Bevan
  • Adrian Irles
  • Adrian, Ka Wai Chung
  • Adriana Bariego Quintana
  • Adriana Simancas
  • Adriano Lai
  • Adrita Chakraborty
  • Afroditi Papadopoulou
  • Agni Bethani
  • Ahmed Abdelmotteleb
  • AHSAN MEHMOOD KHAN
  • Ajit Kumar
  • Akash Srivastav
  • Akitaka Ariga
  • Alain Bellerive
  • Alain Blondel
  • Alba Romero-Rodríguez
  • Albert Zhou
  • Alberto Caliva
  • Alberto Lusiani
  • Alberto Roper Pol
  • Alberto Ruiz Jimeno
  • Aldo Gamboa
  • Alejandro Bris
  • Alejandro De Yta Hernandez
  • Alejandro Segarra
  • Alejandro Soto Rodríguez
  • Alejo Rossia
  • Aleksander Filip Zarnecki
  • Aleksander Gajos
  • Aleksandr Svetlichnyi
  • Aleksas Mazeliauskas
  • Aleksei Zinchenko
  • Alessandro Balbino
  • Alessandro Bartoloni
  • Alessandro Cardini
  • Alessandro D.A.M. Spallicci
  • Alessandro Guida
  • Alessandro Montella
  • Alessia Renardi
  • Alessio Berti
  • Alessio Notari
  • Alessio Tiberio
  • Alex Jenkins
  • Alex Keshavarzi
  • Alex Kääpä
  • Alex Wang
  • Alexander Burgman
  • Alexander Froehlich
  • Alexander Glazov
  • Alexander Grohsjean
  • Alexander Ivashkin
  • Alexander Kalweit
  • Alexander Kartavtsev
  • Alexander Kartavtsev
  • Alexander Leopold
  • Alexander Mann
  • Alexander Maximilian Paasch
  • Alexander Parkhomenko
  • Alexander Studenikin
  • Alexander Tsvirov
  • Alexander Tulupov
  • Alexander Ward
  • Alexander Zakharov
  • Alexander Zaytsev
  • Alexandra Dobrynina
  • Alexandre Arbey
  • Alexandre Göttel
  • Alexandre Salas-Bernárdez
  • Alexandros Attikis
  • Alexandros Karas
  • Alexey Lichkunov
  • Alfiia Mukhaeva
  • Ali Alavi
  • Ali DASTGHEIBI FARD
  • Ali Yoonesyaan
  • Alicia Wongel
  • Alina-Tania Neagu
  • Alisa Shukhtina
  • Aliwen Delgado
  • Aliya Nigamova
  • Amalia Pop
  • Aman Desai
  • AMAN Gupta
  • Amandip De
  • Amarjit Soni
  • Ambar Nafees
  • Amber Roepe
  • Amelia Lindner
  • Amen Allah Andolsi
  • Amina Khatun
  • Amit Adhikary
  • Ana Luisa Carvalho
  • Ana M. Teixeira
  • Anant Shri
  • Anatael Cabrera
  • Anders Eller Thomsen
  • Anders Knospe
  • Anders Knospe
  • Andre de Gouvea
  • Andre Zimermmane-Santos
  • Andrea Addazi
  • Andrea Banfi
  • Andrea Cardini
  • Andrea Dainese
  • Andrea Dubla
  • Andrea Lampis
  • Andrea Malara
  • andrea messina
  • Andrea Miani
  • Andrea Quadri
  • Andrea Rizzi
  • Andrea Trapote Fernández
  • Andreas Albert
  • Andreas Bischof
  • Andreas Haungs
  • Andreas Hinzmann
  • Andreas Hoecker
  • Andreas Jansen
  • Andreas Mantziris
  • Andrei Gritsan
  • Andrei Kovtun
  • Andrew Loeliger
  • Andrew Mastbaum
  • Andrew Miller
  • Andrii Tykhonov
  • Andrii Usachov
  • Andrzej Bożek
  • Andrzej Hryczuk
  • Andrzej Kupsc
  • Andrzej Smykiewicz
  • Andrés Rentería-Olivo
  • Andy Wharton
  • ANEEK JANA
  • Angela Romano
  • Angeles Faus-Golfe
  • Angie Parra
  • Anil Kumar
  • Anirban Das
  • Anish Ghoshal
  • Anita Lavania
  • Anja Beck
  • Anja Brenner
  • ANJALI S
  • Anju Bhasin
  • Anjuli Kumari Anand
  • Anna Albrecht
  • Anna Benecke
  • Anna Chrysostomou
  • Anna Franckowiak
  • Anna Ivina
  • Anna John
  • Anna Kaczmarska
  • Anna Lipniacka
  • Anna Lupato
  • Anna Macchiolo
  • Anna Tokareva
  • Annapaola de Cosa
  • Annarita Margiotta
  • Anne-Catherine Le Bihan
  • Anson Hook
  • Anthony Correia
  • Anthony Ezeribe
  • Antoine Lesauvage
  • Anton Sokolov
  • Antonio Boveia
  • Antonio Costantini
  • Antonio Dobado González
  • Antonio Giannini
  • Antonio Gioiosa
  • Antonio Jacques Costa
  • Antonio Jesus Gomez Delegido
  • Antonios Agapitos
  • António Morais
  • Anwesha Sahu
  • Anıl Karatay
  • Ao Xu
  • Aoumeur DADDI HAMMOU
  • aparna sankar
  • Aparup Ghosh
  • Apurba Tiwari
  • Apurba Tiwari
  • Arantxa Ruiz Martinez
  • Aravind Sugunan
  • Arely Cortes Gonzalez
  • Ariane Frey
  • Arie Bodek
  • Ariel Edery
  • Ariel Goobar
  • Arif Akhundov
  • Arindam Das
  • Arindam Sen
  • Arjen van Vliet
  • Armando Bermudez Martinez
  • Arnaud Ferrari
  • Arnd Meyer
  • Arnd Specka
  • Arnold Hannah
  • Arpan Ghosal
  • Arsenii Gavrikov
  • Artem Basalaev
  • Artem Kotliarov
  • Artem Popov
  • Arthur Bolz
  • Arthur HIRSCH
  • Arthur Linss
  • Arthur Schaffer
  • Artur Lobanov
  • Arturo Sanchez
  • Arvind Bhaskar
  • Arvind Kumar
  • Ashish Sehrawat
  • Ashraf Mohamed
  • Atacan KILIÇGEDİK
  • Aurelio Juste Rozas
  • Aurore Savoy Navarro
  • Avi Friedlander
  • Avnish .
  • Axel Maas
  • Ayan Paul
  • Ayman Hallal
  • Aytadzh Allakhverdieva
  • Aytul Adiguzel
  • Azam Zabibi
  • Babar Ali
  • Babette Döbrich
  • Badder Marzocchi
  • badr-eddine ngair
  • BaoSheng Gao
  • Barbara Dalena
  • Barbara Erazmus
  • Barbara Mele
  • Barbara Trzeciak
  • Barbara Warmbein
  • Barbora Bruant Gulejova
  • Barenya Dev
  • Barilang Mawlong
  • Barry Ginat
  • Bartosz Dziewit
  • Beate Heinemann
  • Bedřich Roskovec
  • Belina von Krosigk
  • Ben Brueers
  • Ben Hodkinson
  • Benedict Tobias Winter
  • Benedikt Wach
  • Benjamin Berczi
  • Benjamin Bolling
  • Benjamin Dönigus
  • Benjamin Hounsell
  • Benjamin Nachman
  • Benjamin Tannenwald
  • Benno List
  • Benoit Blossier
  • Benoit Clément
  • Beojan Stanislaus
  • Bernardo Gonçalves
  • Bernhard Mistlberger
  • Bethany Suter
  • Bhanu Pranav Challa
  • Bhanu Pranav Challa
  • Bhawani Singh
  • Bhawna Gomber
  • Bhupesh Dixit
  • Bhuvaneshwari Kashi
  • Bianca Bottino
  • Bianca Scavino
  • Bibhabasu De
  • Bijan Saghai
  • Biljana Mitreska
  • Bing Li
  • Biplab Dey
  • Bjoern Penning
  • Bjoern Soenke Wonsak
  • Bjoern Spruck
  • Björn Herrmann
  • Björn Wendland
  • Bodo Lampe
  • Bogumila Swiezewska
  • Boris Hippolyte
  • Boris Tomasik
  • Bostjan Golob
  • Bowen Fu
  • Bradley Garland
  • Brahim Aitbenchikh
  • Brian Cole
  • Brun Rene
  • Brunella D'Anzi
  • Bryan Cardwell
  • Bugra Bilin
  • Burak Bilki
  • Camila Ramos
  • Camille Bonvin
  • Cao Bo
  • Carl A. Lindstrøm
  • Carl Mikael Berggren
  • Carlos Erice Cid
  • Carlos Escobar Ibáñez
  • Carlos Lacasta
  • Carlos Marinas
  • Carlos Moreno Martinez
  • Carlos Quezada
  • Carlos Solans
  • Carlos Vico Villalba
  • Carmelita Carbone
  • Carmen Richter
  • Carmen Victoria Villalba Petro
  • Carolina Bolognani
  • Caroline Collard
  • Carsten Niebuhr
  • Caspar Schmitt
  • Catalina Morales-Gutiérrez
  • Caterina Checchia
  • Celestine Segbefia
  • Cem Eröncel
  • Cesar Augusto Bernardes
  • Charanjit Kaur Khosa
  • Chayanit Asawatangtrakuldee
  • Chen Zhou
  • Cheng Chen
  • Chengchao Yuan
  • Chenglu Xiong
  • Chenxi Gu
  • Chetan Gohil
  • Chiara Aimè
  • Chiara Oppedisano
  • Chiara Perrina
  • Chiara Roda
  • Chinmay Shahi
  • Chris Damerell
  • Chris Malena Delitzsch
  • Chris Potter
  • Chris Van Den Broeck
  • Christian Appelt
  • Christian Broennum-Hansen
  • Christian Grefe
  • Christian Karl
  • Christian Kiesling
  • Christian Scharf
  • Christian Schmitt
  • Christian Schwanenberger
  • Christian Weinheimer
  • Christian Wiel
  • Christine Kourkoumelis
  • Christoph Borschensky
  • Christoph Krieger
  • Christoph Langenbruch
  • Christophe Royon
  • Christopher Anelli
  • Christopher Eckner
  • Christopher Hayes
  • Christopher McGinn
  • Christopher Parkinson
  • Christopher Thorpe
  • Christopher Young
  • Christos Anastopoulos
  • Christos Vergis
  • Chuangxin Lin
  • Chun-Khiang Chua
  • Chung Kao
  • Cigdem Issever
  • Claire Adam
  • Claire Gwenlan
  • Claire Lee
  • Clara Bartels
  • Clara Elisabeth Leitgeb
  • Clara Nellist
  • Clara Ramon Alvarez
  • Clara Troncon
  • Clara Álvarez Luna
  • Clarissa Siqueira
  • Claude Amsler
  • Claudia Brizzolari
  • Claudia Lazzaro
  • Claudio Andrea Manzari
  • Claudio Gatti
  • Clemens Lange
  • Clement Helsens
  • Connie Potter
  • Cornelius Vollbrecht
  • Costas Andreopoulos
  • Costas Bachas
  • Craig Sawyer
  • Cristina Botta
  • Cristina Lazzeroni
  • Cristina Ripoli
  • Cvetan Cheshkov
  • Cyril Renevey
  • Cyrin Neeraj
  • Daariimaa Battulga
  • Dafne Carolina Arias Perdomo
  • Dag Gillberg
  • Daiki Sekihata
  • Dana Abdallah
  • Danaisis Vargas Oliva
  • Dani Rose J Marattukalam
  • Daniel Baxter
  • Daniel Behrend-Uriarte
  • Daniel Britzger
  • Daniel Heuchel
  • Daniel Johnson
  • Daniel Lopez-Coto
  • Daniel Schulte
  • Daniela Bortoletto
  • Daniela Koeck
  • Daniele Zanzi
  • Danijela Bogavac
  • Danny Laghi
  • Dario Soldi
  • Dariusz Miskowiec
  • Dave Sutherland
  • David Charlton
  • David d'Enterria
  • David Droz
  • David Francisco Renteria
  • David Henaff
  • David Jackson
  • David Keitel
  • David Kirchmeier
  • David Muller
  • David Newbold
  • David Romero Abad
  • David Walter
  • Davide Basilico
  • Davide Fiorina
  • Davide Guerra
  • Davide Meloni
  • Davide Pietro Mungo
  • Davide Sgalaberna
  • Debangana Sarkar
  • Deion Fellers
  • Dengfeng Zhang
  • Deniz Bozkurt
  • Deniz Sunar Cerci
  • DENNIS AROGANCIA
  • Dennis Cazar Ramírez
  • Despina Hatzifotiadou
  • Di Wang
  • Diana Navas
  • Diana Patricia Mendez
  • Didier Contardo
  • Diego Blas
  • Diganta Das
  • Dillon Fitzgerald
  • Dirk Krücker
  • Dominik Elsässer
  • Donatella Lucchesi
  • Dong Liu
  • Dong Liu
  • Dongshuo Du
  • Doris Yangsoo Kim
  • Douglas Jacob
  • Duarte Azevedo
  • Duygu Halis
  • Débora Barreiros
  • Ed Scott
  • Eduardo Garnacho Velasco
  • Eduardo Rodrigues
  • Eduardo Simas
  • Eftychia Tzovara
  • Egor Antipov
  • Eiasha Waheed
  • Eileen Schwanold
  • Eimear Conroy
  • El Abassi Abderrazaq
  • Elena Dall'Occo
  • Elena Perez del Rio
  • Eleni Vryonidou
  • Eleonora Delfrate
  • Eleonora Diociaiuti
  • Eleonora Loiacono
  • Eleonora Rossi
  • Elia Bottalico
  • Eligio Lisi
  • Elina Merkel
  • Elisa Lohfink
  • Elisa Minucci
  • Elisabetta Baracchini
  • Elisabetta Gallo
  • Elise Le Boulicaut
  • Elizabeth Dobson
  • Elizabeth Locci
  • Elizaveta Shabalina
  • Elliot Reynolds
  • Elodie Resseguie
  • Elzbieta Richter-Was
  • Emanuel Pfeffer
  • Emanuela Musumeci
  • Emanuele Bagnaschi
  • Emanuele Gendy
  • Emil Gorm Nielsen
  • Emilio Ciuffoli
  • Emily Ann Smith
  • Emma Kun
  • Emma Marshall
  • Emmanuel Saridakis
  • Emmanuel Tsesmelis
  • Emrys Peets
  • Engin Eren
  • Eniko Regos
  • Enrico Guiraud
  • Enrico Morgante
  • Enrique Iñiguez
  • Eric Ballabene
  • Eric Baussan
  • Eric Madge
  • Erica Polycarpo
  • Erik Adli
  • Erik Buhmann
  • Eryk Czerwiński
  • Esteban Fullana
  • Ethan Simpson
  • Etienne Blanco
  • Eugene Jevgenijs Proskurins
  • Eugenia Koptyaeva
  • Eugenia Spedicato
  • Evelin Meoni
  • Evgeniy Kovalenko
  • Evgeny Soldatov
  • Fabian Lange
  • Fabian Vogel
  • Fabio Anulli
  • Fabio Catalano
  • Fabio Cerutti
  • Fabio Iemmi
  • Fabricio Jiménez Morales
  • Fagner Cintra Correia
  • Faig Ahmadov
  • Fanrong Xu
  • Fares Djama
  • Farida Fassi
  • Farinaldo Queiroz
  • Fatma Boran
  • Federica Cuna
  • Federica Fabbri
  • Federica Piazza
  • Federico Antinori
  • Federico Betti
  • Federico De Lillo
  • Federico Meloni
  • federico siviero
  • Fedor Lazarev
  • Fei Xu
  • Felipe J. Llanes-Estrada
  • Felipe Silva
  • Felix Erben
  • Ferdinand Willeke
  • Ferenc Siklér
  • Fergus Hayes
  • Filip Krizek
  • Filipe Joaquim
  • Filippo Varanini
  • Finn Jonathan Labe
  • Fionn Bishop
  • Flavia Cetorelli
  • Flavia de Almeida Dias
  • Florencia Canelli
  • Florian Bernlochner
  • Florian Fabry
  • Florian Fischer
  • Florian Goertz
  • Florian Loebbert
  • Florian Nortier
  • Florian Reiss
  • Foteini Trantou
  • Francesca Acanfora
  • Francesca Bellini
  • Francesca Calore
  • Francesca Dordei
  • Francesca Ercolessi
  • Francesca Mazzotta
  • Francesco Brizioli
  • Francesco Collamati
  • Francesco Dettori
  • Francesco Di Renzo
  • Francesco Fabozzi
  • Francesco Giovanni Celiberto
  • Francesco Giuli
  • Francesco Pandolfi
  • Francesco Pio De Cosmo
  • Francesco Romeo
  • Francesco Setti
  • Francesco Spanò
  • Francisco Arco Garcia
  • Francisco Garcia
  • Francisco Sequeira Murillo
  • Franco Cervelli
  • Francois Richard
  • Frank Filthaut
  • Frank Sauerburger
  • Frank Siegert
  • Frank Simon
  • Frank Zimmermann
  • Franz Glessgen
  • Franz Muheim
  • Franziska Reiner
  • Frederic Yermia
  • Freya Blekman
  • Friederike Januschek
  • Fulvia De Fazio
  • furkan dolek
  • Gadam Chiranjeevi
  • Ganapathy Ramanathan
  • Garvita Agarwal
  • Gavriil Chatzitheodoridis
  • Gayoung Chon
  • Geha Reddy
  • Geliang Liu
  • Georg Steinbrueck
  • Georg Weiglein
  • George Japaridze
  • George W.S. Hou
  • Georgy Donchenko
  • Georgy Kornakov
  • Gerald Eigen
  • German Sborlini
  • Germán Rodrigo
  • Gernot Scheerer
  • Giacomo Marocco
  • Gian Luca Pinna Angioni
  • Gian Michele Innocenti
  • Gian Michele Innocenti
  • Giancarlo D Ambrosio
  • gianluca bianco
  • Gianluca Cavoto
  • Gianluca Inguglia
  • Gianny Mestdach
  • Gianpaolo Bellini
  • Gilberto Colangelo
  • Gioacchino Piazza
  • Gioacchino Ranucci
  • GIORGIA MINIELLO
  • Giovanni Abbiendi
  • Giovanni De Lellis
  • Giovanni Francesco Tassielli
  • Giovanni Marchiori
  • Giovanni Passaleva
  • Giovanni Zattera
  • Giulia Collura
  • giulia manca
  • Giuseppe Callea
  • Giuseppe Lucente
  • Gloria Cicconofri
  • Gokcen Karslioglu
  • Gonzalo Herrera
  • Gonzalo Merino
  • Goran Kacarevic
  • Gordana Lastovicka-Medin
  • Gordana Milutinovic-Dumbelovic
  • Goutam Das
  • Graziano Venanzoni
  • Gregor Kasieczka
  • Gregorio Bernardi
  • Gregorio Carullo
  • Gregory Patellis
  • Grégory Moreau
  • Gudrid Moortgat-Pick
  • Guglielmo Frattari
  • Guilherme Milhano
  • Guillaume Oliviéro
  • Guillelmo Gomez Ceballos Retuerto
  • Guillem Domenech
  • Guillermo Gómez Fonfría
  • Gustavo Valdiviesso
  • György Wolf
  • haitham Zaraket
  • Hakan Çetinkaya
  • Halil Saka
  • Hamed Abdolmaleki
  • Hamed Bakhshiansohi
  • Hamzeh Khanpour
  • Hanfei Ye
  • Hanieh Karimi
  • Hannes Jung
  • Hannes Rüter
  • Hannsjörg Weber
  • Hans-Günther Moser
  • Harish Chandra Das
  • HARITHA C P
  • Haruka Asada
  • Heberth Torres Dávila
  • Hector Gisbert
  • Heidi Rzehak
  • Heisig Jan
  • Helen Maguire
  • Helena Santos
  • Henning Kirschenmann
  • Henrik Jabusch
  • Henrique Brito Câmara
  • Henry Day-Hall
  • Henry Kißler
  • Henry Lubatti
  • Heribertus Bayu Hartanto
  • Hermann Degenhardt
  • Hesham El Faham
  • Hichem Bouchamaoui
  • Himadri Parashar
  • HIREN KAKKAD
  • Hisanori Suzuki
  • Hok-Chuen "Tom" Cheng
  • Holly Pacey
  • Honey Khindri
  • Hongjie Mu
  • Hongtao Yang
  • Howard Gordon
  • Hsin-Wei Hsia
  • Hua Pei
  • Hua-Sheng Shao
  • Huacheng Cai
  • Hugues Lattaud
  • Huilin Qu
  • Hwidong Yoo
  • Iacopo Vivarelli
  • Ian Kenyon
  • iara Tosta e Melo
  • Ichiro Adachi
  • Ida Storehaug
  • Iffat Ara Mazumder
  • Ignasi Rosell
  • Igor Ognev
  • Ihor Komarov
  • Ilaria Vai
  • Imma Riu
  • Ina Carli
  • Inar Timiryasov
  • Ines Ochoa
  • Ingrid-Maria Gregor
  • Ioannis Koutalios
  • Ioannis Ploumistakis
  • Ioannis Theiakoulis
  • Ioannis Tsinikos
  • Irene Tamborra
  • Irene Valenzuela
  • Irina Ene
  • Irina Parnova
  • Isabella Masina
  • Ishwar Singh
  • Itana Bubanja
  • Iulia-Stefania Trandafir
  • Ivan Esteban
  • Ivan Nišandžić
  • Ivan Polyakov
  • Ivana Hristova
  • Ivania Maturana Avila
  • Iwan Morton-Blake
  • Iwona Grabowska-Bold
  • Izabela Kochanek
  • Işıl Başaran Öz
  • J Tobias Tsang
  • Jacinto Neto
  • Jack MacDonald
  • Jacky Kumar
  • Jacob Linacre
  • Jacopo Fumagalli
  • Jacqueline Keintzel
  • Jakob Beyer
  • Jakub Cimerman
  • James Frost
  • James Mulligan
  • James Wetzel
  • Jamie Nagle
  • Jan Eysermans
  • Jan Fiete Grosse-Oetringhaus
  • Jan Harms
  • Jan Kalinowski
  • Jan Klamka
  • Jan Plefka
  • Jan-Frederik Schulte
  • Janik Ditzel
  • Janusz Chwastowski
  • Janusz Gluza
  • Jaroslav Štorek
  • Jaroslaw Nowak
  • Jason Aebischer
  • Jason Veatch
  • Jasper Roosmale Nepveu
  • Javier Cuevas
  • Javier Fernandez
  • Javier Mazzitelli
  • javier Suarez-Sucunza
  • Jay Chan
  • Jaydeep Datta
  • Jaydip Singh
  • Jean-François Grivaz
  • Jean-Loup Tastet
  • Jeffrey Davis
  • Jeffrey Lazar
  • Jem Guhit
  • Jens Osterhoff
  • Jesse Liu
  • Jessica Ferreira
  • Jessica Metcalfe
  • Jesús Aguilera-Verdugo
  • Jesús Bonilla
  • Jesús Peña-Rodríguez
  • Jiabao Yang
  • Jian Liu
  • Jianming Qian
  • Jianrun Hu
  • Jiaoyang Li
  • Jiawei Cao
  • Jiayi Chen
  • Jiayin Gu
  • Jibo He
  • Jinfei Wu
  • Jing-yu Zhu
  • Jinjing Li
  • Jinlin Fu
  • Jiri Chudoba
  • Jiri Kvita
  • Jiwon Park
  • Joana Reis
  • Joanna Wanczyk
  • Joany Manjarres
  • Joany Manjarres Ramos
  • Joao Barata
  • Joao Martins
  • Joaquin Hoya
  • Jochen Jens Heinrich
  • Joe Davies
  • Joern Schwandt
  • Johann Usovitsch
  • Johannes Bloms
  • Johannes Braathen
  • Johannes Haller
  • Johannes Hessler
  • Johannes Michel
  • Johannes Scheller
  • Johny Jaramillo
  • Jona Motta
  • Jonas Kunath
  • Jonas Lindert
  • Jonas Tjemsland
  • Jonathan Butterworth
  • Jonathan Colburn
  • Jonathan David Bossio Sola
  • Jonathan Jamieson
  • Jonathan Kriewald
  • Jonathan Long
  • Jonathon Langford
  • Jorge Alda Gallo
  • Jorge Martin Camalich
  • Jorge Terol Calvo
  • Jorge Vallejo
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  • Todd Huffman
  • Tom Neep
  • Tom Sokolinski
  • Tom Steudtner
  • Tomas Dado
  • Tomas Truhlar
  • Tomasz Krajewski
  • Tommaso Fulghesu
  • Tomoko Ariga
  • Tong Xu
  • Toni Mäkelä
  • Torben Ferber
  • Torbjörn Sjöstrand
  • Tord Ekelof
  • Toru Iijima
  • Tracey Berry
  • Tracy Slatyer
  • Traudl Kozanecki
  • Tristan du Pree
  • Tyler Corbett
  • Udai Singh
  • Ulascan Sarica
  • Ulrich Einhaus
  • Umsalimat Abdullaeva
  • Upala Mukhopadhyay
  • Urs Heller
  • Uta Bilow
  • Uta Klein
  • Uwe Schneekloth
  • Vadim Shakhov
  • Vaisakh Plakkot
  • Valentin Ustinov
  • Valentin Volkl
  • Valentina Biancacci
  • Valentina Cairo
  • Valentina Santoro
  • Valeri Khoze
  • Valerie Gibson
  • Valeriia Lukashenko
  • Valerio D'Amico
  • Valerio Faraoni
  • Valeriya Kachmar
  • Valery Schegelsky
  • Vana Pezelj
  • Varsha Senthilkumar
  • Varun Sharma
  • Vasiliki Mitsou
  • Vasily Kornoukhov
  • Verena Martinez Outschoorn
  • Veronica Sanz
  • Veronique Boisvert
  • Verónica Villa Ortega
  • Veta Ghenescu
  • Veysi Erkcan Özcan
  • Victor Lohezic
  • Victor Miralles
  • Victoria Martin
  • Vikranth Pulamathi
  • Viktor Kutzner
  • Viktor Thorén
  • Vincent Boudry
  • Vincenzo Minissale
  • Vincenzo Vitagliano
  • Violaine Bellée
  • Vishnu Padmanabhan Kovilakam
  • Vishva Patel
  • VISMAYA V S
  • Vit Kucera
  • Vladimir Druzhinin
  • Vladimir Obraztsov
  • Vladimir Pastushenko
  • Vladimir Smolyar
  • Vladyslav Shtabovenko
  • Volodymyr Aushev
  • Vukasin Milosevic
  • Véronique Bernard
  • Víctor Serrano
  • Víctor Vila
  • Waleed Abdallah
  • Walter Del Pozzo
  • Walter Wuensch
  • Wasikul Islam
  • Wei Dou
  • Wei Shi
  • Weiming Yao
  • Weishuang Linda Xu
  • Wen Guan
  • Wentai Luo
  • Werner Hofmann
  • Werner Porod
  • William Barter
  • William J. Torres Bobadilla
  • William Korcari
  • William Leight
  • William Panduro Vazquez
  • Witold Kozanecki
  • Wojciech Kotlarski
  • Wolfgang Mader
  • Xiangkun Dong
  • Xiaodong Shi
  • Xiaohu Sun
  • xiaokang zhou
  • Xiaolin Wang
  • Ximo Poveda
  • Xingguo Li
  • Xinmeng Ye
  • Xiu-Fei Li
  • Xiu-Lei Ren
  • Xuan Chen
  • Xuefeng Ding
  • Yacine Haddad
  • Yair Mulian
  • Yalcin Guler
  • Yan Liu
  • Yan Qian
  • Yang Ma
  • Yann Gouttenoire
  • Yannick Müller
  • Yanping Huang
  • Yara Do Amaral Coutinho
  • Yariela Araya
  • Yasaman Farzan
  • Yasar Onel
  • Yasser Radkhorrami
  • Yassine El Ghazali
  • Yasuyuki Okumura
  • Yee Chinn Yap
  • Yesenia Hernández Jiménez
  • Yi Chung
  • Yichao Hu
  • Yifeng Sun
  • Ying Lin
  • Yiota Foka
  • Ynyr Harris
  • Yoav Afik
  • Yongcheng Wu
  • You Zhou
  • Younes Belmoussa
  • Yoxara Sánchez Villamizar
  • Yu Nakahama
  • Yubo Li
  • Yufeng Li
  • Yuki Mitsumori
  • Yukiyoshi Ohnishi
  • Yun-Ju Lu
  • Yun-Ju Lu
  • Yury Suvorov
  • Yusuf Saheed
  • Yuta Takahashi
  • Yuuki Hayashi
  • Yuval Nissan
  • Yuxiang Guo
  • Yuya Mino
  • Yuzi Yang
  • Yvonne Pachmayer
  • Zacharias Painesis
  • Zachary picker
  • Zafar Yasin
  • Zelimir Djurcic
  • Zhe Wang
  • Zhe Yang
  • Zhengwen Liu
  • Zhi Zheng
  • Zhidong Zhang
  • Zhiyuan Chen
  • Zhoudunming Tu
  • Zhuoni Qian
  • Zhuoran Huang
  • Zihang Wang
  • Zijun Xu
  • Zoltan Nagy
  • Zoltan Trocsanyi
  • Zulit Paola Arrubarrena Tame
  • Zurab Tavartkiladze
  • Zuzana Moravcova
  • Zuzanna Żak
  • Óscar Boente García
  • Şeyma Esen
Surveys
EPS 2021 survey
EPS-HEP2021 conference secretariat
    • 10:00 12:00
      T01: Astroparticle and Gravitational Waves: Part 1
      Convener: Prof. Oliver Gerberding (UNI/EXP (Uni Hamburg, Institut fur Experimentalphysik))
      • 10:00
        Cold aberrations and locking of Central Interferometer of Advanced Virgo+ 20m

        The target sensitivity of Advanced Virgo for O4 is about 90-120 Mpc for the BNS range. To achieve this, several hardware upgrades are under process. One of the most relevant concerns installation of the Signal Recycling Mirror, which forms an additional marginally stable cavity along with the power recycling cavity already present in Advanced Virgo. Therefore, to compensate for these (cold) optical aberrations, new Central Heating benches were installed by the TCS subsystem.
        I will describe the installation and pre-commissioning of CO_2 central heating, which assists the lock of DRMI by compensating for the (cold) optical aberrations, and the procedure followed for locking the Dual Recycled Michelson Interferometer along with the tuning of CO_2 central heating.”

        Speaker: Priyanka Giri (INFN Pisa)
      • 10:20
        The performance of the Virgo gravitational-wave detector during the O3 run (04/2019-03/2020) and the impact of the external environment 20m

        The Observation Run 3 (O3) is the longest data-taking period to-date for the LIGO-Virgo global network of ground-based interferometric gravitational-wave (GW) detectors. The GWTC catalog of transient GW events has already been updated for the first six months of the run (O3a: 2019/04/01 -> 2019/19/01) while the analysis of the last five months (O3b: 2019/11/01 -> 2020/03/27, after a one-month commissioning break) is ongoing. This talk will review the performance of the Virgo detector during the O3 run: sensitivity, duty cycle, noise stability and variations. It will in particular focus on the impact of the external environment on this performance: earthquakes, anthropogenic seismic noise, local weather at the EGO site, etc. The experience gained should allow the Virgo Collaboration to improve the robustness of its instrument against external disturbances and to develop improved strategies to mitigate their consequences. This work is ongoing during the current shutdown, besides major detector upgrades, prior to the start of the upcoming O4 run during summer 2022.

        Speaker: Dr Nicolas Arnaud (IJCLab (UPSaclay and CNRS/IN2P3) and EGO)
      • 10:40
        Instrument science challenges of the Einstein Telescope 20m

        The Einstein Telescope (ET) is a planned third-generation gravitational wave observatory in Europe. The ET observatory is composed of three detectors that together form an equilateral triangle. Each detector consists of two interferometers, one optimised for low frequencies from 3 Hz to 30 Hz and another optimised for high frequencies from 30 Hz to 10 kHz. In order to reach its ambitious sensitive target ET will require significant technology advances compared to current facilities, from cryogenic suspensions to Newtonian noise subtraction. We have recently started the effort towards the technical design of the detectors and the infrastructure. In this talk I will provide a short overview of the unique challenges and plans of ET instrument science activities.

        Speaker: Andreas Freise (VU Amsterdam and Nikhef)
      • 11:00
        Lunar Gravitational-Wave Antenna 20m

        Gravitational waves excite quadrupolar vibrations of elastic bodies. Monitoring these vibrations was one of the first concepts proposed for the detection of gravitational waves by Joseph Weber. At laboratory scale, these experiments became known as resonant-bar detectors, which form an important part of the history of GW detection. Due to the dimensions of these bars, the targeted signal frequencies were in the kHz range. It was also Weber who suggested to monitor vibrations of Earth and Moon to search for gravitational waves in the mHz band. His Lunar Surface Gravimeter was deployed on the Moon in 1972 by the Apollo 17 crew. A design error made it impossible to carry out the intended search for GWs, but the idea remains intriguing. We have proposed a new concept, the Lunar Gravitational-Wave Antenna (LGWA), based on Weber’s idea. LGWA would have a rich GW and multi-messenger science case with galactic binaries and massive black-hole binaries potentially closing the frequency gap between LISA and terrestrial GW detectors. It would also serve as a high-precision geophysical station shedding light on the interior structure of the Moon, the mechanisms of moonquakes, and the Moon's formation history. LGWA's key component is a next-generation, high-sensitivity seismometer to be deployed on the Moon. For its most sensitive realization, LGWA would have to be deployed in a permanent shadow near the north or south pole of the Moon to benefit from the natural cryogenic environment. This would improve the sensitivity of the seismometer and also provide a lower-noise environment due to the absence of thermally induced seismic events that were observed in large numbers by the Apollo seismometers. Powering of the seismic stations and data transfer pose additional challenges for such a deployment.

        Speaker: Jan Harms (Gran Sasso Science Institute)
      • 11:20
        Upper limits on the amplitude of ultra-high-frequency gravitational waves from graviton to photon conversion 20m

        First experimental upper limits for stochastic ultra-high-frequency gravitational waves are obtained using data from existing facilities that have been constructed and operated to detect WISPs (Weakly Interacting Slim Particles). Using the graviton to photon conversion in the presence of their magnetic field, we exclude gravitational waves in the frequency bands from $\left(2.7 - 14\right)\times10^{14}$~Hz and $\left(5 - 12\right)\times10^{18}$~Hz down to a characteristic amplitude of $h_c^{\rm min}\approx6\times 10^{-26}$ and $h_c^{\rm min}\approx 5\times 10^{-28}$ at 95\% confidence level, respectively. This principle applies to all experiments of this kind, with prospects of constraining (or detecting), for example, stochastic gravitational waves background from light primordial black hole evaporation in the early universe.

        Speaker: Aldo Ejlli (Cardiff University)
      • 11:40
        Searching for dark photon dark matter in the third observing run of LIGO/Virgo 20m

        We report results from a search for ultralight dark photon dark matter using data from the third observing run of Advanced LIGO and Virgo. This type of dark matter could directly couple to the interferometers and cause a time-dependent quasi-sinusoidal force on the mirrors proportional to the total proton plus neutron number, or just neutron number. We describe two methods to search for this interaction, one that cross correlates data from different detectors, and another that varies the analysis coherence time to account for the expected signal frequency spread and looks for excess power in each detector. We also compare our sensitivity to those from existing direct dark matter experiments for a wide range of dark photon masses.

        Speaker: Andrew Miller (UCLouvain)
    • 10:00 12:00
      T03: Dark Matter: Part 1
      Convener: Laura Lopez-Honorez (Universite Libre de Bruxelles)
      • 10:00
        Dark matter from evaporating Black Holes 20m

        Primordial black holes might have existed in the early Universe and, via their evaporation mechanism (completed before Big Bang Nucleosynthesis), they might have released stable particles beyond the Standard Model. We discuss the possibility that such particles might constitute all or a fraction of the dark matter observed today, also considering the bounds on warm dark matter. If sufficiently light, stable particles from primordial black holes evaporation might provide a significant contribution to dark radiation.

        Speaker: Isabella Masina
      • 10:20
        Dark matter and dark radiation from primordial black holes 20m

        Primordial black holes (PBHs) lighter than $10^9\,$g are at present mostly unconstrained, because they evaporate before Big Bang Nucleosynthesis (BBN). Hence, they can not represent a fraction of dark matter (DM). However, their evaporation products can leave an imprint on the early universe observables. In this talk, we will decribe how the public code BlackHawk has been adapted to compute the Hawking radiation of light PBHs with the addition of a dark sector particle. Depending on this particle mass, it can result in a contribution to warm DM or dark radiation. The first one is further constrained using structure formation thanks to CLASS and the second one contributes to $\Delta N_\text{eff}$, constrained by BBN and CMB (future) experiments. We conclude by giving the Hawking radiation constraints on light PBHs.

        Speaker: Jérémy Auffinger (Institut de Physique des 2 Infinis - Lyon - FRANCE)
      • 10:40
        Shining Light on Dark Matter with Black Holes 20m

        What is dark matter, the mysterious predominant constituent of all matter in the Universe? As I will show, primordial black holes from the early Universe make an attractive non-particle dark matter candidate, with intimate connections to astronomical puzzles like the origin of heavy elements (gold) as well as ongoing boom in gravity wave and multi-messenger astronomy. In fact, primordial black holes from the general formation scenario of bubble multiverse might have already been seen by Subaru Hyper Suprime-Cam.

        Speaker: Volodymyr Takhistov
      • 11:00
        Searches for dark matter with the ATLAS detector 20m

        The presence of a non-baryonic Dark Matter (DM) component in the Universe is inferred from the observation of its gravitational interaction. If Dark Matter interacts weakly with the Standard Model (SM) it could be produced at the LHC. The ATLAS experiment has developed a broad search program for DM candidates, including resonance searches for the mediator which would couple DM to the SM, searches with large missing transverse momentum produced in association with other particles (light and heavy quarks, photons, Z and H bosons) called mono-X searches and searches where the Higgs boson provides a portal to Dark Matter, leading to invisible Higgs decays. The results of recent searches on 13 TeV pp data, their interplay and interpretation will be presented. Prospects for HL-LHC will also be discussed.

        Speaker: Jonathan Bossio (CERN)
      • 11:20
        Dark Matter searches in CMS 20m

        Searches for dark matter at colliders are a powerful complementary probe to elucidate the nature of this hitherto unobserved form of matter. We present CMS searches for dark matter candidate particles and new mediators interacting with them. Various final states, topologies, and kinematic variables are explored utilizing the full Run-II data-set collected at the LHC. Furthermore, we interpret the results of the searches for direct dark matter production as well as visible decays of new mediators in the broader dark matter search landscape.

        Speaker: Raman Khurana (Florida State University)
      • 11:40
        New sensitivity of LHC measurements to Composite Dark Matter 20m

        We present sensitivity of LHC Standard Model (SM) differential cross-section measurements for so-called “stealth dark matter” scenarios occurring in an SU(ND) dark gauge group, where constituents are charged under the SM and ND =2 or 4. The low-energy theory contains mesons which can be produced at the LHC and a scalar baryon dark matter (DM) candidate which cannot. We evaluate the impact of LHC measurements on the dark meson masses. Using existing lattice results, we then connect the LHC explorations to DM phenomenology, in particular considering direct-detection experiments. We show that current LHC measurements constrain DM masses in the 10s of TeV regime. We discuss potential pathways to explore these models further using LHC measurements.

        Speaker: Louie Corpe (CERN)
    • 10:00 12:00
      T04: Neutrino Physics: Neutrino mass & properties
      Convener: Bjoern Soenke Wonsak (UNI/EXP (Uni Hamburg, Institut fur Experimentalphysik))
      • 10:00
        The Singly-Charged Scalar Singlet as the Origin of Neutrino Masses 20m

        We consider the generation of neutrino masses via a singly-charged scalar singlet. Under general assumptions we identify two distinct structures for the neutrino mass matrix. This yields a constraint for the antisymmetric Yukawa coupling of the singly-charged scalar singlet to two left-handed lepton doublets, irrespective of how the breaking of lepton-number conservation is achieved. The constraint disfavours large hierarchies among the Yukawa couplings. We study the implications for the phenomenology of lepton-flavour universality, measurements of the $W$-boson mass, flavour violation in the charged-lepton sector and decays of the singly-charged scalar singlet. We also discuss the parameter space that can address the Cabibbo Angle Anomaly.

        Speaker: Tobias Felkl (University of New South Wales)
      • 10:20
        Modullar Invariance Approch to the Flavour Problem: Fermion Mass Hierarchies and Residual Modular Symmetries 20m

        We will discuss the approach to the flavour problem
        based on modular invariance.
        In modular-invariant models of flavour,
        hierarchical fermion mass matrices may arise
        solely due to the proximity of the modulus $\tau$
        to a point of residual symmetry.
        This mechanism does not require flavon fields, and modular
        weights are not analogous to Froggatt-Nielsen charges.
        We show that hierarchies depend on the decomposition
        of field representations under the residual symmetry group.
        We systematically go through the
        possible fermion field representation choices which may yield
        hierarchical structures in the vicinity of symmetric points,
        for the four smallest finite modular groups, isomorphic
        to $S_3$, $A_4$, $S_4$, and $A_5$, as well as for their double covers.
        We find a restricted set of pairs of representations for which the
        discussed mechanism may produce viable fermion (charged-lepton and quark)
        mass hierarchies. After formulating the conditions for obtaining a viable lepton
        mixing matrix in the symmetric limit, we construct a model in which both
        the charged-lepton and neutrino sectors are free from fine-tuning.

        Speaker: Serguey Petcov (SISSA/INFN, Trieste, Italy)
      • 10:40
        A systematic approach to neutrino masses and their phenomenology 20m

        We propose a model-independent framework to classify and study neutrino mass models and their phenomenology. The idea is to introduce one particle beyond the Standard Model which couples to leptons and carries lepton number together with an operator which violates lepton number by two units and contains this particle. This allows to study processes which do not violate lepton number, while still working with an effective field theory. The contribution to neutrino masses translates to a robust upper bound on the mass of the new particle. We compare it to the stronger but less robust upper bound from Higgs naturalness and discuss several lower bounds. Our framework allows to classify neutrino mass models in just 20 categories, further reduced to 14 once nucleon decay limits are taken into account, and possibly to 9 if also Higgs naturalness considerations and direct searches are considered.

        Speaker: Michael Schmidt (UNSW Sydney)
      • 11:00
        First Sub-eV Neutrino Mass Limit from the KATRIN Experiment 20m

        The KATRIN experiment is designed to measure the effective electron anti-neutrino mass $m_\nu$ with a sensitivity close to 0.2 eV by investigating the energy spectrum of tritium $\beta$-decay. After a brief introduction of the experiment, we will focus on the results from our second data taking phase which took place in autumn 2019. For this period, the source activity was increased by a factor of four with respect to the first campaign and around 4.2 million electrons were collected in the region of interest. A fit to this data including all dominant uncertainties yields $m^2_\nu = 0.26 \pm 0.34$ eV$^2$. This corresponds to an upper limit of $m_\nu < 0.9$ eV (sensitivity $m_\nu < 0.7$ eV) using the method of Lokhov and Tkachov. Finally, we will give a brief outlook on the upcoming measurement phases.

        Speaker: Christian Karl (Max Planck Institute for Physics)
      • 11:20
        Electromagnetic neutrino: The theory, laboratory experiments and astrophysical probes 20m

        We continue our discussions [1-4] on neutrino electromagnetic properties. In the present talk we start with a short introduction to the derivation of the general structure of the electromagnetic form factors of Dirac and Majorana neutrinos.

        Then we consider experimental constraints on neutrino magnetic and electric dipole moments, electric millicharge, charge radii and anapole moments from the terrestrial laboratory experiments (the bounds obtained by the reactor MUNU, TEXONO and GEMMA experiments and the solar Super-Kamiokande and the recent Borexino experiments). A special credit is done to the most severe constraints on neutrino magnetic moments, millicharge and charge radii [5-9]. The world best reactor [5] and solar [6] neutrino and astrophysical [10,11] bounds on neutrino magnetic moments, as well as bounds on millicharge from the reactor neutrinos [7] are included in the recent issues of the Review of Particle Physics (see the latest Review: P.A. Zyla et al. (Particle Data Group), Prog. Theor. Exp. Phys. 2020, 083C01). The best astrophysical bound on neutrino millicharge was obtained in [12].

        In the recent studies [13] it is shown that the puzzling results of the XENON1T collaboration [14] at few keV electronic recoils could be due to the scattering of solar neutrinos endowed with finite Majorana transition magnetic moments of the strengths lie within the limits set by the Borexino experiment with solar neutrinos [6]. The comprehensive analysis of the existing and new extended mechanisms for enhancing neutrino transition magnetic moments to the level appropriate for the interpretation of the XENON1T data and leaving neutrino masses within acceptable values is provided in [15].

        Considering neutrinos from all known sources, as well as including all available data from XENON1T and Borexino, the strongest up-to-date exclusion limits on the active-to-sterile neutrino transition magnetic moment are derived in [16] .

        A comprehensive analisys of constraints on neutrino electric millicharge from experiments of elastic neutrino-electron interaction and future prospects involving coherent elastic neutrino-nucleus scattering is presented in [17].

        We also present results of the recent detailed study [18] of the electromagnetic interactions of massive neutrinos in the theoretical formulation of low-energy elastic neutrino-electron scattering. The formalism of neutrino charge, magnetic, electric, and anapole form factors defined as matrices in the mass basis with account for three-neutrino mixing is presented. Using the derived new expression for a neutrino electromagnetic scattering cross section [18], we further developed studies of neutrino electromagnetic properties using the COHERENT data [8] and obtained [9] new bounds on the neutrino charge radii from the COHERENT experiment. Worthy of note, our paper [9] has been included by the Editors Suggestion to the Phys. Rev. D “Highlights of 2018”, and the obtained constraints on the nondiagonal neutrino charge radii since 2019 has been included by the Particle Data Group to the Review of Particle Physics.

        The main manifestation of neutrino electromagnetic interactions, such as: 1) the radiative decay in vacuum, in matter and in a magnetic field, 2) the neutrino Cherenkov radiation, 3) the plasmon decay to neutrino-antineutrino pair, 4) the neutrino spin light in matter, and 5) the neutrino spin and spin-flavour precession are discussed. Phenomenological consequences of neutrino electromagnetic interactions (including the spin light of neutrino [19]) in astrophysical environments are also reviewed.

        The second part of the proposed talk is dedicated to results of our mostly recently performed detailed studies of new effects in neutrino spin, spin-flavour and flavor oscillations under the influence of the transversal matter currents [20] and a constant magnetic field [21,22], as well as to our newly developed approach to the problem of the neutrino quantum decoherence [23] and also to our recent proposal [24] for an experimental setup to observe coherent elastic neutrino-atom scattering (CEνAS) using electron antineutrinos from tritium decay and a liquid helium target that as we have estimated opens a new frontier in constraining the neutrino magnetic moment.

        The discussed in the second part of the talk new results include two new effects that can be summarized as follows:

        1) it is shown [20] that neutrino spin and spin-flavor oscillations can be engendered by weak interactions of neutrinos with the medium in the case when there are the transversal matter currents; different possibilities for the resonance amplification of oscillations are discussed, the neutrino Standard Model and non-standard interactions are accounted for;

        2) within a new treatment [21] of the neutrino flavor, spin and spin-flavour oscillations in the presence of a constant magnetic field, that is based on the use of the exact neutrino stationary states in the magnetic field, it is shown that there is an interplay of neutrino oscillations on different frequencies. iIn particular: a) the amplitude of the flavour oscillations νLe↔ νLμ at the vacuum frequency is modulated by the magnetic field frequency μB , and b) the neutrino spin oscillation probability (without change of the neutrino flavour) exhibits the dependence on the neutrino energy and mass square difference Δm2 .

        The discovered new phenomena in neutrino oscillations should be accounted for reinterpretation of results of already performed experiments on detection of astrophysical neutrino fluxes produced in astrophysical environments with strong magnetic fields and dense matter. These new neutrino oscillation phenomena are also of interest in view of future experiments on observations of supernova neutrino fluxes with large volume detectors like DUNE, JUNO and Hyper-Kamiokande.

        Two other new results discussed in the concluding part of the talk are as follows:

        3) a new theoretical framework, based on the quantum field theory of open systems applied to neutrinos, has been developed [23] to describe the neutrino evolution in external environments accounting for the effect of the neutrino quantum decoherence; we have used this approach to consider a new mechanism of the neutrino quantum decoherence engendered by the neutrino radiative decay to photons and dark photons in an astrophysical environment, the corresponding new constraints on the decoherence parameter have been obtained;

        4) in [24] we have proposed an experimental setup to observe coherent elastic neutrino-atom scattering (CEνAS) using electron antineutrinos from tritium decay and a liquid helium target and shown that the sensitivity of this apparatus (when using 60 g of tritium) to a possible electron neutrino magnetic moment can be of order about 7×10−13μB at 90% C.L., that is more than one order of magnitude smaller than the current experimental limit.

        The best world experimental bounds on neutrino electromagnetic properties are confronted with the predictions of theories beyond the Standard Model. It is shown that studies of neutrino electromagnetic properties provide a powerful tool to probe physics beyond the Standard Model.

        References:

        [1] C. Guinti and A. Studenikin, Neutrino electromagnetic interactions: A window to new physics, Rev. Mod. Phys. 87 (2015) 531-591.

        [2] C. Giunti, K. Kouzakov, Y. F. Li, A. Lokhov, A. Studenikin, S. Zhou, Electromagnetic neutrinos in laboratory experiments and astrophysics, Annalen Phys. 528 (2016) 198.

        [3] A. Studenikin, Neutrino electromagnetic interactions: A window to new physics - II,
        PoS EPS-HEP2017 (2017) 137.

        [4] A. Studenikin, Electromagnetic neutrino properties: new constraints and new effects,
        PoS ICHEP2020 (2021)180.

        [5] A. Beda, V. Brudanin, V. Egorov et al., The results of search for the neutrino magnetic
        moment in GEMMA experiment , Adv. High Energy Phys. 2012 (2012) 350150.

        [6] M. Agostini et al (Borexino coll.), Limiting neutrino magnetic moments with Borexino Phase-II solar neutrino data, Phys. Rev. D 96 (2017) 091103.

        [7] A. Studenikin, New bounds on neutrino electric millicharge from limits on neutrino magnetic moment, Europhys. Lett. 107 (2014) 21001.

        [8] D. Papoulias, T. Kosmas, COHERENT constraints to conventional and exotic neutrino physics, Phys. Rev. D 97 (2018) 033003.

        [9] M. Cadeddu, C. Giunti, K. Kouzakov, Y.F. Li, A. Studenikin, Y.Y. Zhang, “Neutrino charge radii from COHERENT elastic neutrino-nucleus scattering”, Phys. Rev. D 98 (2018) 113010.

        [10] N. Viaux, M. Catelan, P. B. Stetson, G. G. Raffelt et al., Particle-physics constraints from the globular cluster M5: neutrino dipole moments, Astron. & Astrophys. 558 (2013) A12.

        [11] S. Arceo-Díaz, K.-P. Schröder, K. Zuber and D. Jack, Constraint on the magnetic dipole moment of neutrinos by the tip-RGB luminosity in ω-Centauri, Astropart. Phys. 70 (2015) 1.

        [12] A. Studenikin, I. Tokarev, Millicharged neutrino with anomalous magnetic moment in rotating magnetized matter, Nucl. Phys. B 884 (2014) 396-407.

        [13] O. G. Miranda, D. K. Papoulias, M. Tórtola, J. W. F. Valle, XENON1T signal from transition neutrino magnetic moments , Phys.Lett. B 808 (2020) 135685.

        [14] E. Aprile et al. [XENON], Observation of excess electronic recoil Events in XENON1T, Phys. Rev. D 102 (2020) 072004.

        [15] K. Babu, S. Jana, M. Lindner, Large neutrino magnetic moments in the light of recent experiments, JHEP 2010 (2020) 040.

        [16] V. Brdar, A. Greljo, J. Kopp, T. Opferkuch, The neutrino magnetic moment portal: Cosmology, astrophysics, and direct detection, JCAP01 (2021) 039.

        [17] A. Parada, Constraints on neutrino electric millicharge from experiments of elastic neutrino-electron interaction and future experimental proposals involving coherent elastic neutrino-nucleus scattering, Adv.High Energy Phys. 2020 (2020) 5908904.

        [18] K. Kouzakov, A. Studenikin, Electromagnetic properties of massive neutrinos in low-energy
        elastic neutrino-electron scattering, Phys. Rev. D 95 (2017) 055013.

        [19] A. Grigoriev, A. Lokhov, A. Studenikin, A. Ternov, Spin light of neutrino in astrophysical environments, JCAP 1711 (2017) 024 (23 p.).

        [20] P. Pustoshny, A. Studenikin, Neutrino spin and spin-flavour oscillations in transversal
        matter currents with standard and non-standard interactions, Phys. Rev. D 98 (2018) 113009.

        [21] A. Popov, A. Studenikin, Neutrino eigenstates and flavour, spin and spin-flavour oscillations in a constant magnetic field, Eur. Phys. J. C 79 (2019) 144.

        [22] P. Kurashvili, K. Kouzakov, L. Chotorlishvili, A. Studenikin, Spin-flavor oscillations of ultrahigh-energy cosmic neutrinos in interstellar space: The role of neutrino magnetic moments”, Phys. Rev. D 96 (2017) 103017.

        [23] K. Stankevich, A. Studenikin, Neutrino quantum decoherence engendered by neutrino radiative decay, Phys. Rev. D 101 (2020) 056004.

        [24] M. Cadeddu, F. Dordei, C. Giunti, K. Kouzakov, E. Picciau, A. Studenikin, Potentialities of a low-energy detector based on 4He evaporation to observe atomic effects in coherent neutrino scattering and physics perspectives, Phys. Rev. D 100 (2019) 073014.

        Speaker: Alexander Studenikin (Moscow State University and JINR)
      • 11:40
        Distinguishing Dirac vs Majorana Neutrinos at CE$\nu$NS experiments 20m

        Coherent Elastic Neutrino Nucleus Scattering (CE$\nu$NS) provide a novel window to probe new physics connected with the well established non-vanishing neutrino masses. In this talk we will discuss how in the presence of a transition magnetic moment of neutrinos the CE$\nu$NS experiments have the potential to shed light on the nature of neutrinos: Dirac vs Majorana. In particular, we will take the NUCLEUS experiment as an example to demonstrate that through a study of differential energy distribution of the final states the CEνNS experiments can potentially achieve such a feat.

        Speaker: Chandan Hati (Technische Universität München, James-Franck-Straße 1, D-85748 Garching, Germany)
    • 10:00 12:00
      T05: Heavy Ion Physics: Part 1

      Note: All contributions are given 12 minutes + 3 min for questions

      • 10:00
        Recent heavy-flavor measurements with the ATLAS detector 15m

        Measurements of open heavy-flavor hadron production in heavy-ion collisions provide a powerful tool to study both initial-state effects on heavy-quark production and final-state interactions between heavy-quarks and the quark-gluon plasma (QGP). These measurements are performed with the ATLAS detector at the LHC and capitalize on the large statistics of the Run 2 Pb+Pb dataset. This talk presents published results on the azimuthal anisotropy ($v_2$ and $v_3$) of muons from heavy-flavor decays in Pb+Pb collisions, as well as new results on the nuclear modification factor ($R_\mathrm{AA}$) for heavy-flavor muons, both in the region $p_\mathrm{T} > 4$ GeV. In both measurements, muons from charm and bottom hadrons are statistically separated using the transverse impact parameter with respect to the primary collision vertex. Muons from both charm and bottom hadrons are found to have significant azimuthal anisotropies in Pb+Pb collisions, with larger anisotropies for muons from charm hadrons than for muons from bottom hadrons. Muons from both sources are also observed to be strongly suppressed with respect to the $pp$ baseline, in a way that depends on the mass of the parent hadron at low to moderate muon $p_\mathrm{T}$. The simultaneous measurement of multiple observables ($v_2$, $v_3$, and $R_\mathrm{AA}$) for both charm and bottom with the same detector and technique is particularly crucial in providing constraints on state of the art theoretical predictions.

        Speaker: Jamie Nagle
      • 10:15
        Recent results of D0 mesons azimuthal anisotropy using the CMS detector 15m

        In a relativistic heavy ion collision, heavy flavor (charm and bottom) quarks are mostly created via hard processes at the early stage of collisions. We present the latest results of the azimuthal anisotropy coefficients v_n for prompt and non-prompt D0 mesons in PbPb, pPb, and pp collisions from the CMS experiment. The studies are about collectivity phenomena in smaller systems (pp and pPb), searches for the effects of very strong electromagnetic fields created in the initial stages of ultrarelativistic PbPb collisions, and charm quark energy loss in the quark-gluon plasma.

        Speaker: Cesar Bernardes (Universidade Federal do Rio Grande do Sul)
      • 10:30
        Open charm and beauty production and anisotropy from small to large systems with ALICE 15m

        In this talk, the nuclear modification factor ($R_{\rm AA}$) and the elliptic flow ($v_{2}$) of open heavy-flavour hadrons via their hadronic and semileptonic decays to electrons at midrapidity and to muons at forward rapidity in heavy-ion collisions will be discussed. In particular, the latest results on the centrality dependence of $R_{\rm AA}$ of charmed hadrons, beauty-decay electrons, non-prompt $\mathrm{D}^0$ and the new measurement of non-prompt $\mathrm{D}^{+}_{s}$ in Pb--Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV will be shown. They provide important constraints to the energy loss mechanisms in the medium and their mass dependence, and provide information about the fragmentation of heavy quarks to strange heavy-flavour hadrons. Final and high precision measurements of elliptic flow of heavy-flavour particles provide stringent information about the thermal degrees of freedom of heavy quarks in the QGP, path-length dependence of heavy-quark in-medium energy loss and recombination effects. The elliptic flow of charmed hadrons and of the beauty-decay electrons will help test whether heavy quarks thermalise in the medium. Comparisons with model calculations including the interaction of heavy quarks with the hot, dense, and deconfined medium will be discussed. In this contribution, the final measurements of beauty production using beauty-decay electrons and non-prompt D in pp collisions at $\sqrt{s}$ = 5.02 TeV are also reported. They provide important tests of perturbative QCD calculations.

        Speaker: Stefano Trogolo (CERN)
      • 10:45
        Recent LHCb results on charm in the QCD medium 15m

        With full particle ID, precision tracking, and calorimetry, the LHCb detector is able to measure prompt and non-prompt charm production through a variety of decay channels at forward rapidity. These unique abilities allow LHCb to study a wide range of exotic and conventional open and hidden charm states and their interactions in the QCD medium. Here we will discuss recent LHCb results on charm production in pp and pPb collisions, including the first results on chi_c production in nuclear collisions at the LHC, and compare the results with various theoretical models.

        Speaker: Chenxi Gu (cern)
      • 11:00
        Measurements of jet suppression and modification in heavy-ion collisions with ATLAS 15m

        Measurements of jet suppression and modification in heavy-ion collisions provide powerful and broad information on the dynamics of the hot, dense plasma formed in relativistic nucleus-nucleus collisions. In this talk we present measurements of jet energy loss and modification which are performed using the high-statistics Pb+Pb collision data at 5.02 TeV recorded during 2018 with the ATLAS detector at the LHC. These data can provide insight into the path length or system size dependence of energy loss, fluctuations in the energy loss process, the modification of parton fragmentation, and the re-distribution of lost energy.

        This talk will first present a broad measurement of the single jet yields as a function of the azimuthal angle with respect to the 2nd, 3rd, and 4th event planes in Pb+Pb collisions. The azimuthal anisotropies for jets are reported as a function of jet $p_{\rm T}$ and centrality. This talk will also present a measurement of the fully unfolded dijet momentum balance in high-statistics Pb+Pb and pp data. The balance distributions are presented as a function of centrality and leading jet $p_{\rm T}$, exploring a significantly higher kinematic range than Run 1 results. Finally, the talk presents a measurement of Z-tagged charged hadron yields, which feature an opportunity to understand the energy loss, and its redistribution by the medium, for low-$p_{\rm T}$ partons in a calibrated way.

        Speaker: Christopher McGinn (ATLAS, sPHENIX, University of Colorado Boulder)
      • 11:15
        Influence of scattering versus coherent parton branching on the $k_T$ broadening of QCD cascades in a medium 15m

        Heavy ion collisions at high energies can be used as an interesting way to recreate and study the medium of the quark-gluon plasma (QGP).
        We particularly investigate how jets produced in hard binary collisions evolve within a tentative medium and in particular how the jet-particle momentum components $k_T$ orthogonal to the jet
        axis are affected.
        We evolved the jets within a medium that contains both, transverse kicks
        as well as medium induced coherent radiation within the MINCAS-algorithm [1] following the works of [2,3].
        In this framework parton branching occurs simultaneously to scatterings within the medium, leading to the interference effects that reproduce the well known BDMPS-Z emission rates and sizeable $k_T$ broadening.
        It is, thus, interesting to study the relative importances of $k_T$ broadening from the coherent splittings and different types of in-medium scatterings.
        We find a clear hierarchy of the influences from different scattering effects and deflections during branchings:
        While scattering still yields the largest contributions to broadening, the branching effects are comparable in size.
        We also observed that the $k_T$ distributions in our results differ considerably from a Gaussian distribution in transverse momentum.

        References:
        [1] K. Kutak, W. Płaczek, R. Straka, Eur.Phys.J. C79 (2019) no.4, 317
        [2] J.-P. Blaizot, F. Dominguez, E. Iancu, Y. Mehtar-Tani, JHEP 1301 (2013) 143
        [3] J.-P. Blaizot, F. Dominguez, E. Iancu, Y. Mehtar-Tani, JHEP 1406 (2014) 075

        Speaker: Martin Rohrmoser (Institute of Nuclear Physics, Polish Academy of Sciences)
      • 11:30
        Measurements of jet quenching via hadron+jet correlations in Pb-Pb and high-particle multiplicity pp collisions with ALICE 15m

        Interactions of high-$p_{T}$ partons with quark-gluon plasma (QGP) result in jet quenching, which is manifest by the suppression of high-$p_{T}$ jet yields and the modification of jet substructure and di-jet acoplanarity distributions.
        Several jet quenching phenomena can be measured precisely over a wide range of jet $p_{T}$ using semi-inclusive distributions of charged-particle jets recoiling from a high-$p_{T}$ trigger hadron, which incorporate data-driven suppression of the large uncorrelated background produced in heavy-ion collisions.

        In this talk we report semi-inclusive measurements of hadron-jet acoplanarity in Pb-Pb collisions at $\sqrt{s_{\rm{NN}}} = 5.02$ TeV and high-particle multiplicity pp collisions at $\sqrt{s} = 13$ TeV. In the Pb-Pb system, where QGP formation is established, narrowing of the acoplanarity is observed relative to a reference distribution from pp collisions. In contrast, pp events with high-particle multiplicity exhibit a broadening of the acoplanarity relative to minimum bias events. In this case, however, qualitatively similar features are also seen in pp collisions generated by PYTHIA, which does not include jet quenching or other QGP effects. We will discuss the current status of these analyses, and prospects to understand the origin of these striking phenomena.

        Speaker: Artem Kotliarov
      • 11:45
        First steps towards the quantum simulation of jet quenching 15m

        The leading order $\alpha_s$ effect in jet quenching corresponds to the broadening of the jet's transverse momentum, due to the multiple interactions with the underlying medium. A complete understanding of momentum broadening is critical for the success of jet quenching phenomenology.

        In this talk, we introduce a strategy to quantum simulate single particle momentum broadening in a QCD background medium. We argue that it is, in principle, possible to extract the jet quenching parameter $\hat{q}$ from such an algorithm. More importantly, this corresponds to the first step towards simulating full medium induced parton showers, which is far beyond the capabilities of classical computers.

        Speaker: Joao Barata (IGFAE)
    • 10:00 12:00
      T06: QCD and Hadronic Physics: Part 1: Exclusive physics and diffraction

      Note: All contributions are given 12 minutes + 3 min for questions

      Conveners: Ferenc Siklér (Wigner RCP, Budapest) , Mateusz Dyndal (AGH UST Krakow)
      • 10:00
        Measurement of Exclusive pi+pi- and rho0 Meson Photoproduction at HERA 15m

        Exclusive photoproduction of $\rho^0(770)$ mesons is studied using the H1 detector at the $ep$ collider HERA. A sample of about 900000 events is used to measure single- and double-differential cross sections for the reaction $\gamma{}p\to \pi^{+}\pi^{-}Y$. Reactions where the proton stays intact ($m_Y=m_p$) are statistically separated from those where the proton dissociates to a low-mass hadronic system ($m_p<{}m_Y<{}10$ GeV). The double-differential cross sections are measured as a function of the invariant mass $m_{\pi\pi}$ of the decay pions and the squared $4$-momentum transfer $t$ at the proton vertex. The measurements are presented in various bins of the photon-proton collision energy $W_{\gamma{}p}$. The phase space restrictions are $0.5<{}m_{\pi\pi}<{}2.2$ GeV, $\vert{}t\vert<{}1.5$ GeV$^2$, and $20<{}W_{\gamma{}p}<{}80$ GeV. Cross section measurements are presented for both elastic and proton-dissociative scattering. The observed cross section dependencies are described by analytic functions. Parametrising the $m_{\pi\pi}$ dependence with resonant and non-resonant contributions added at the amplitude level leads to a measurement of the $\rho^0(770)$ meson mass and width at $m_\rho=770.8^{+2.6}_{-2.7}$ (tot) MeV and $\Gamma_\rho=151.3^{+2.7}_{-3.6}$v (tot) MeV, respectively. The model is used to extract the $\rho^0(770)$ contribution to the $\pi^{+}\pi^{-}$ cross sections and measure it as a function of $t$ and $W_{\gamma{}p}$. In a Regge asymptotic limit in which one Regge trajectory $\alpha(t)$ dominates, the intercept $\alpha(t{=}0)=1.0654^{+0.0098}_{-0.0067}$ (tot) and the slope $\alpha^\prime(t{=}0)=0.233^{+0.067}_{-0.074}$ (tot) GeV$^{-2}$ of the $t$ dependence are extracted for the case $m_Y{=}m_p$.

        Eur.Phys.J.C80 (2020), 1189

        Speaker: Arthur Bolz (BELLE (BELLE Gruppe))
      • 10:15
        Central exclusive production of pipi, KK and pp pairs with forward proton measured in Roman Pot detectors in proton proton collisions at sqrt(s)=200 GeV with the STAR detector. 15m

        Abstract attached as pdf file.

        Speaker: Leszek Adamczyk (AGH University of Science and Technology (PL))
      • 10:30
        Production of dileptons via photon-photon fusion in proton-proton collisions with one forward proton measurement 15m

        We discuss mechanisms of dilepton production in proton-proton collisions with rapidity gap in the main detector and one forward proton in the forward proton detectors. This is relevant for LHC measurements by ATLAS+AFP and CMS+PPS. Transverse momenta of the intermediate photons are included and photon fluxes are expressed in terms of proton electromagnetic form factors and structure functions. Differential distributions in $\xi_{1/2}$, $M_{ll}$, $Y_{ll}$, $p_{t,ll}$ are shown and the competition of different mechanisms is discussed. Both double-elastic and single-dissociative processes are included in the calculation. We discuss also mechanism with one forward $\Delta^+$ isobar, or other proton resonances in the final state not discussed so far in the literature. The role of several cuts is studied. The rapidity gap survival factor is calculated for each contribution separately. The soft rapidity gap survival factor for the case of single proton measurement is significantly smaller than that for the inclusive case (no proton measurement). The gap survival with and without proton measurement in forward proton detector are compared and the underlying dynamics is discussed. The dependence on the parametrization of the proton structure functions is shown in addition. The gap survival factor for the single-dissociative mechanism due to minijet emission into the main detector are calculated in addition. The corresponding gap survival factor depends on the invariant mass of the dilepton system as well as the mass of the proton remnant and rapidity of the lepton pair.

        A. Szczurek, B. Linek and M. {\L}uszczak, a paper in preparation.

        Speaker: Marta Luszczak (University of Rzeszow)
      • 10:45
        Measurements of diffractive physics and soft QCD at ATLAS 15m

        In this talk we present various measurements of diffractive physics and soft QCD processes performed using data collected by the ATLAS experiment at the LHC. Single diffractive processes (pp->pX) are studied reconstructing the particles from the dissociative system (X) with the ATLAS detector, while the intact proton is reconstructed and measured in a forward detector. If available, this talk will also present the underlying event measurements using strange particles as probes. Also in this talk, we present, If available, studies of correlation phenomena in order to study the dynamics of hadronization formation.

        Speaker: Dr Lydia Beresford (CERN)
      • 11:15
        Single-diffractive production of heavy mesons in pp and pA collisions 15m

        In this talk we present our theoretical results for the single-diffractive production of open heavy flavor mesons and non-prompt charmonia in pp and pA collisions. Using the color dipole framework, we found that this mechanism constitutes 0.5-2 per cent of the inclusive production of the same mesons. In Tevatron kinematics our theoretical results are in reasonable agreement with the available experimental data. In LHC kinematics we found that the cross-section is sufficiently large and could be accessed experimentally. We also analyzed the dependence on multiplicity of co-produced hadrons and found that it should be significantly slower than that of inclusive production of the same heavy mesons. If this expectation will be confirmed experimentally, this could constitute important contribution to our understanding of multiplicity enhancement mechanisms in the production of different quarkonia states. We also analyzed this process in pA collisions and found that the cross-section per nucleon decerases by up to a factor of two compared to pp production due to nuclear saturation effects.

        This presentation is partially based on our recent publication Phys.Rev.D 102 (2020) 7, 076020 [arXiv:2008.12446 [hep-ph]]

        Speaker: Dr Marat Siddikov (Federico Santa Maria Technical University (UTFSM))
      • 11:30
        Searching for the odderon in exclusive $pp \to pp \phi$ and $pp \to pp \phi \phi$ reactions at the LHC 15m

        We discuss the possibility to use the exclusive $pp \to pp \phi$ and $pp \to pp \phi \phi$ reactions in identifying the odderon exchange, the charge conjugation C = -1 counterpart of the C = +1 pomeron. The odderon was introduced on theoretical grounds in [1]. Results of the TOTEM collaboration suggest that the odderon exchange can be responsible for a disagreement of theoretical calculations and the TOTEM data [2,3]. It is premature to draw definite conclusion. Here we present some recent studies for two related processes where the odderon exchange may show up. We apply recently proposed the tensor-pomeron and vector-odderon model [4]. The first reaction is central exclusive production (CEP) of pairs of $\phi$ mesons [5]. Here odderon exchange is not excluded by the WA102 experimental data [7] for high $\phi \phi$ invariant masses. The process is advantageous as here odderon does not couple to protons. Comparison with data from the WA102 experiment and predictions for the LHC experiments will be presented. The observation of large $M_{\phi \phi}$ and $Y_{\phi \phi}$ (rapidity distance between the $\phi$) seems well suited to identify odderon exchange. We discuss also the $p p \to p p \phi$ reaction [6]. At high energies probably the photon-pomeron fusion is the dominant process. The odderon-pomeron fusion is an interesting alternative. Adding odderon exchange with parameters adjusted for the $\phi \phi$ production improves considerably description of the proton-proton angular correlations measured by the WA102 collaboration [8]. At the low energy we consider also some other subleading processes that turned out to be rather small. A combined analysis of both the $K^+ K^-$ and $\mu^+ \mu^-$ channels should be the ultimate goal in searches for odderon in single $\phi$ CEP at the LHC. Predictions for the LHC experiments will be presented.

        [1] L. Łukaszuk, B. Nicolescu, Lett. Nuovo Cim. 8 (1973) 405;
        [2] E. Martynov, B. Nicolescu, Phys. Lett. B786 (2018) 207;
        [3] TOTEM Collaboration, Eur. Phys. J. C79 (2019) 785, Eur. Phys. J. C80 (2020) 91;
        [4] C. Ewerz, M. Maniatis, O. Nachtmann, Annals Phys. 342 (2014) 31;
        [5] P. Lebiedowicz, O. Nachtmann, A. Szczurek, Phys. Rev. D99 (2019) 094034;
        [6] P. Lebiedowicz, O. Nachtmann, A. Szczurek, Phys. Rev. D101 (2020) 094012;
        [7] WA102 Collaboration, Phys. Lett. B432 (1998) 436;
        [8] A. Kirk, Phys. Lett. B489 (2000) 29.

        Speaker: Piotr Lebiedowicz (IFJ PAN, Cracow)
      • 11:45
        Comparison of $pp$ and $p \bar{p}$ differential elastic cross sections and observation of the exchange of a colorless $C$-odd gluonic compound 15m

        We describe an analysis comparing the $p\bar{p}$ elastic cross section as measured by the D0 Collaboration at a center-of-mass energy of 1.96~TeV to that in $pp$ collisions as measured by the TOTEM Collaboration at 2.76, 7, 8, and 13 TeV using a model-independent approach. The TOTEM cross sections, extrapolated to a center-of-mass energy of $\sqrt{s} =$ 1.96 TeV, are compared with the D0 measurement in the region of the diffractive minimum and the second maximum of the $pp$ cross section.
        The two data sets disagree at the 3.4$\sigma$ level and thus provide evidence for the $t$-channel exchange of a colorless, $C$-odd gluonic compound, also known as the odderon.
        We combine these results with a TOTEM analysis of the same $C$-odd exchange based on the total cross section and the ratio of the real to imaginary parts of the forward elastic strong interaction scattering amplitude in $pp$ scattering.
        The combined significance is larger than 5$\sigma$ and is interpreted as the first observation of the exchange of a colorless, $C$-odd gluonic compound.

        Speaker: Christophe Royon (The University of Kansas (US))
    • 10:00 12:00
      T07: Top and Electroweak Physics: Part 1

      20 Minutes talks are meant as 15'+5'
      15 Minutes talks are meant as 12'+3'

      Conveners: Elisabetta Gallo-Voss (CMS (CMS-Experiment)) , William Barter (Imperial College London)
      • 10:00
        Measurements of W and Z boson production at ATLAS 15m

        Precision measurements of the production cross-sections of W/Z boson at LHC provide important tests of perturbative QCD and information about the parton distribution functions for quarks within the proton. We present measurements of the transverse momentum distribution of the vector boson at 13 TeV. If available differential measurements in the side band of the Z-mass peak are also presented. The measurements are corrected for detector inefficiency and resolution and compared with state-of-the-art theoretical calculations.

        Speaker: Matthias Schott (Uni Mainz)
      • 10:15
        CMS Inclusive vector bosons results including Drell-Yan measurements in a wide mass range 15m

        Recent inclusive W,Z measurements and differential results on DY dilepton productions in a wide range of invariant masses are presented, making use of CMS proton collision data at 13 TeV.

        Speaker: Louis Moureaux (Université Libre de Bruxelles)
      • 10:30
        Measurement of the W boson mass at LHCb 15m

        The LHCb experiment covers the forward region of proton-proton collisions, and it can improve the current electroweak landscape by studying the production of W and Z boson in this phase space complementary to ATLAS and CMS. Several preliminary studies have shown the potential of the LHCb experiment to measure the W boson mass with a muon pT based technique, which could yield a statistical precision of 10 MeV if using the full Run 2 dataset. A proof-of-concept measurement of the W boson mass, using only the 2016 dataset, will be presented.

        Speaker: Ross Hunter (The University of Warwick, U.K.)
      • 10:45
        Measuring the polarization of boosted, hadronic $W$ bosons with jet substructure observables 15m

        In this work, we present a new technique to measure the longitudinal and transverse polarization fractions of hadronic decays of boosted $W$ bosons. We introduce a new jet substructure observable denoted as $p_\theta$, which is a proxy for the parton level decay polar angle of the $W$ boson in its rest frame. We show that the distribution of this observable is sensitive to the polarization of $W$ bosons and can therefore be used to reconstruct the $W$ polarization in a model-independent way. As a test case, we study the efficacy of our technique on vector boson scattering processes at the high luminosity Large Hadron Collider and we find that our technique can determine the longitudinal polarization fraction to within $\pm 0.15$.

        Speaker: Songshaptak De (IIT Bombay)
      • 11:00
        Experimental challenges towards a full exploitation of the FCC-ee potential 15m

        The European Strategy for Particle Physics ESPP has recommended a financial and technical feasibility of the FCC colliders and their infrastructure to be carried out for its next upgrade around 2025/6. The integral FCC program combines in the same 100km infrastructure a high luminosity Higgs and Electroweak factory e+e- collider, FCC-ee, followed by a 100 TeV hadron collider. With its high luminosity, its clean experimental conditions, and a range of energies that cover the four heaviest particles known today, FCC-ee offers a wealth of physics possibilities, with high potential for discoveries. It is an essential and complementary step towards the 100 TeV hadron collider, and the whole combined program is uniquely rich and powerful. This vision is the backbone of the 2020 ESPP.
        The main challenges of the study are now to design the detector systems that can, demonstrably, fully exploit its potential, while being technically feasible and affordable on the project time scale (start of operations around 2040). With 5.1012 Z produced, the TeraZ run offers b,c,  and QCD physics opportunities, as well as ppm precision challenges on electroweak precision observables and unique searches for extremely rare processes. This breath of opportunities requires very varied and quite specific detector requirements, compared with the higher energy program on Higgs and top physics which is more comparable to the linear collider detector optimization. This variety is clearly in favour of a collider design which foresees four experimental interaction regions. The high precision and varied program is also a considerable challenge for precision calculations.
        The opportunities will be reviewed and the most striking detector challenges will be highlighted.

        Speaker: Alain Blondel (Universite de Geneve (CH) and CNRS (France))
      • 11:15
        Electroweak Precision Physics at FCC-ee 15m

        The Future Circular Collider with electron-positron beams (FCC-ee) should provide improvements of the electroweak precision measurement concerning Z, W, H, and their masses by a large factor over the present status. The unparalleled experimental precision would open, via Electroweak loop corrections, a broad discovery potential for new, at least weakly interacting particles up to high energy scales. The Z boson mass and width, as well as the Z to bb partial width, and the forward-backward asymmetries for leptons and quarks can be measured with high precision with the run at the Z pole, where the instantaneous luminosity is expected to be five to six orders of magnitude larger than LEP. As a result, a precise determination of the effective weak mixing angle, as well as of the running electromagnetic coupling can be extracted directly from the data. Considerable improvements of the strong coupling constant determination will be possible with the measurements of the hadronic widths of the Z and W bosons.

        Speaker: Jan Eysermans (MIT)
      • 11:30
        Vector boson associated with heavy-flavor jets in CMS 15m

        The associated production of vector bosons and jets originating from heavy-flavour (c or b) quarks is a large background source in measurements of other standard model processes, Higgs boson studies, and many searches for physics beyond the standard model. The study of events with a vector boson accompanied by heavy-flavour jets is crucial to refine the theoretical calculations in perturbative QCD, as well as to validate associated Monte Carlo predictions. Differential cross sections are measured as a function of several kinematic observables with the CMS detector.

        Speaker: Sergio Sanchez Navas
      • 11:45
        Two-loop QCD corrections to Wbb production at hadron colliders 15m

        I will present an analytic computation of the two-loop QCD corrections to ud->Wbb process for an on-shell W-boson using the leading colour and massless bottom quark approximations. The computation involves integration-by-parts reduction of the unpolarised squared matrix element using finite field reconstruction techniques and identifying an independent basis of special functions that allows an analytic subtraction of the infrared and ultraviolet poles.

        Speaker: Heribertus Bayu Hartanto (University of Cambridge)
    • 10:00 12:00
      T08: Flavour Physics and CP Violation: Part 1
      Conveners: Jorge Martin Camalich (Instituto de Astrofisica de Canarias) , Shikma Bressler (Weizmann Institute of Science)
      • 10:00
        QCD factorization tests with $\bar{B^0} \to D^{(*)+}\pi^-$ and $\bar{B^0} \to D^{(*)+}K^-$ decays at Belle 15m

        We report new results of the branching fractions $\mathcal{B}(\bar{B}^0\to D^{*+}\pi^{-})$ and $\mathcal{B}(\bar{B}^0\to D^{*+}K^{-})$ measured using $772\times 10^{6}$ $B$-meson pairs recorded by the Belle experiment. The ratio of the branching fractions is measured in a way that allows for the cancellation of systematic uncertainties arising from the $D$-meson reconstruction. Furthermore, we report a new high-precision test of QCD factorisation by measuring ratios of $\bar{B}^0\to D^{*+}h^{-}$ $(h=\pi,K)$ and $\bar{B}^0\to D^{*+}\ell^{-}\bar{\nu}_{\ell}$ decays at fixed momentum transfers for different particle species. The talk also covers related measurements of $B \to D h$ decays performed with the full Belle data.

        Speaker: Eiasha Waheed (High Energy Accelerator Research Organization (KEK))
      • 10:15
        Measurement of the mixing parameter $\chi_d$ in semi-leptonic B meson decays at Belle II 15m

        Inclusive semi-leptonic decays of $B$ mesons are an excellent avenue for the study of B\bar{B} mixing, given their large branching fraction. In this talk, we present the measurement of the time integrated mixing parameter, $\chi_d$, using data collected by the Belle II detector. The Belle II experiment is located at the SuperKEKB laboratory in Tsukuba, Japan where electron-positron collisions at the $\Upsilon(4S)$ energy yield a large number of B\bar{B} events. The mixing parameter $\chi_d$ is determined by examining the charge of reconstructed lepton pairs in $B \rightarrow X \ell \nu$ events. The result is based on 74 $fb^{-1}$ of Belle II reprocessed data.

        Speaker: Stephan Duell (BELLE (BELLE II Experiment))
      • 10:30
        CP-Violating Invariants in the SMEFT 15m

        In the Standard Model, CP violation in the Electroweak sector is parametrized by the Jarlskog Invariant. This is the flavor invariant sensitive to CP violation with the least number of Yukawa matrices that can be built. When higher dimensional operators are allowed, and the Standard Model Effective Field Theory is constructed, numerous new sources for CP violation can appear. However, the description of CP violation as a collective effect, present in the SM, is inherited by its Effective extension. Here, I will discuss how such a behaviour can be consistently captured, at dimension 6, by flavor invariant, CP violating objects, linear in the Wilson coefficients. Such a description ensures that CP violation in the SMEFT is treated in a basis independent manner. In particular, I claim these are the objects that have to vanish, together with the SM Jarlskog Invariant, for CP to be conserved, and viceversa. The scaling properties of these invariants demonstrates that, while CP is not an accidental symmetry of the Standard Model, its breaking is accidentally small at the renormalizable level. Implications for specific flavor models, such as MFV, will be addressed.

        Speaker: Emanuele Gendy (UNI/TH (Uni Hamburg, Institut fuer Theoretische Physik))
      • 10:45
        Unitarity Triangle global fits testing the Standard Model: UTfit 2021 SM update 20m

        Flavour physics represents a unique test bench for the Standard Model (SM). New analyses performed at the LHC experiments are now providing unprecedented insights into CKM metrology and new results for rare decays. The CKM picture can provide very precise SM predictions through global analyses.
        We present here the results of the latest global SM analysis performed by the UTfit collaboration including all the most updated inputs from experiments, lattice QCD and phenomenological calculations.
        We update our analysis of D meson mixing including the latest experimental results. We also derive constraints on absorptive and dispersive CP violation by combining all available data, and discuss future projections. We also provide posterior distributions for observable parameters appearing in D physics.
        Finally we present the perspectives for future UT analyses on the basis of existing extrapolations of experimental results from the Belle-II and LHCb experiments, as well as of expected improvements from Lattice QCD computations.

        Speaker: Marcella Bona (Queen Mary University of London (UK))
      • 11:05
        CP-violating axions 15m

        While the axion was originally introduced to "wash out" CP violation from strong interactions, new sources of CP violation beyond QCD (needed e.g. for the matter-antimatter asymmetry) might manifest themselves via a tiny scalar axion-nucleon component. The latter can be experimentally probed in axion-mediated force experiments, as suggested long ago by J.E. Moody and F. Wilczek. In the present contribution, I will review CP-violating axion searches and report on a recent calculation of the scalar axion-nucleon coupling based on chiral Lagrangian techniques.

        Speaker: Luca Di Luzio (University of Padua and INFN)
      • 11:20
        Measurements of strong-phase parameters at BESIII 15m

        BESIII has collected 2.9 of e+e- collision data sample at 3.773 GeV. We report recent measurements of strong phase differences in D0 and D0-bar decays of KSpi+pi-, KSK+K-, K-pi+pi+pi- and K-pi+pi0. The obtained parameters are important to reduce the systematic uncertainty in the gamma/phi_3 measurement at LHCb and Belle II.

        Speaker: Anita Lavania (IIT Madras)
      • 11:35
        Measurements of the CKM angle gamma at LHCb 20m

        The tree-level determination of the CKM angle gamma is a standard candle measurement of CP violation in the Standard Model. The latest LHCb results from time-integrated measurements of CP violation using beauty to open charm decays are presented. A new combination of all LHCb measurements is also performed. A precision of four degrees is obtained, which dominates the world average.

        Speaker: Dr Mark Whitehead (University of Bristol)
    • 10:00 12:00
      T09: Higgs Physics: Precision - part 1
      Conveners: meng xiao (zhejiang university) , Sarah Heim (DESY) , Michael Trott (NBI) , Giovanni Marchiori (APC Paris - CNRS/IN2P3 and Université de Paris)
      • 10:00
        Measurements and interpretations of Simplified Template Cross Sections, differential and fiducial cross sections in Higgs boson decays to two photons with the ATLAS detector 11m

        Higgs boson decays to two photons can be selected with high efficiency, and the very good invariant mass resolution allows a robust subtraction of the backgrounds. This talk will present measurements of Simplified Template Cross Sections, differential and fiducial cross sections, as measured in the diphoton decay channel by the ATLAS detector using the full Run 2 dataset of pp collision data collected at 13 TeV at the LHC, and their respective interpretations in the context of an Effective Field Theory.

        Speaker: Eleonora Rossi (LAPP)
      • 10:11
        Measurements and interpretations of Simplified Template Cross Sections and differential and fiducial cross sections in Higgs boson decays to two W bosons with the ATLAS detector 11m

        The Higgs boson decay to two W bosons has the largest bosonic branching fraction and can be used to perform some of the most precise measurements of the Higgs boson production cross sections. This talk will present cross section measurements using pp collision data collected at 13 TeV, including those for the different Higgs boson production processes in the Simplified Template Cross Section framework.

        Speaker: Yun-Ju Lu (National Tsing Hua University (TW))
      • 10:22
        Measurements and interpretations of Simplified Template Cross Sections, differential and fiducial cross sections in Higgs boson decays to four leptons with the ATLAS detector 11m

        Higgs boson decays to four leptons can be selected with a very high purity and are very well suited for measurements of Higgs boson properties, despite the small H→ZZ→4l branching ratio. This talk will present measurements of differential cross sections, as well as cross section measurements for the different Higgs boson production processes in the Simplified Template Cross Section framework using pp collision data collected at 13 TeV.

        Speaker: Christos Anastopoulos
      • 10:33
        Measurements of Higgs boson cross sections and differential distributions in bosonic final states (CMS) 17m

        The latest results obtained with CMS data collected at a centre-of-mass energy of 13 TeV targeting Higgs boson decays into gammagamma, WW, ZZ final states at CMS will be discussed.

        Speaker: Jonathon Langford (Imperial College (GB))
      • 10:50
        Parton-Shower Effects in Higgs Production via Vector-Boson Fusion 17m

        We present a systematic investigation of parton-shower and matching uncertainties of perturbative origin for Higgs-boson production via vector-boson fusion. To this end we employ different generators at next-to-leading order QCD accuracy matched with shower Monte Carlo programs, $\texttt{PYTHIA8}$, and $\texttt{HERWIG7}$, and a next-to-next-to-leading order QCD calculation.
        We thoroughly analyse the intrinsic sources of uncertainty within each generator, and then compare predictions among the different tools using the respective recommended setups. Within typical vector-boson fusion cuts, the resulting uncertainties on observables that are accurate to next-to-leading order are at the $10\%$ level for rates and even smaller for shapes. For observables sensitive to extra radiation effects, uncertainties of about $20\%$ are found.
        We furthermore show how a specific recoil scheme is needed when $\texttt{PYTHIA8}$ is employed, in order not to encounter unphysical enhancements for these observables.
        We conclude that for vector-boson fusion processes an assessment of the uncertainties associated with an NLO+PS simulation at next-to-leading order matched to parton showers based only on the variation of renormalisation, factorisation and shower scales systematically underestimates their true size.

        Speaker: Johannes Scheller (Eberhard Karls Universität Tübingen)
      • 11:07
        Combined measurements of Higgs boson production and decays with the ATLAS detector 11m

        The most precise measurements of Higgs boson cross sections, using the framework of simplified template cross sections, are obtained from a combination of measurements performed in the different Higgs boson decay channels using pp collision data with a center-of-mass energy of 13 TeV. This talk presents the combined measurements, as well as their interpretations in terms of Higgs coupling modifiers and their ratios, also taking into account results of searches for H->invisible decays as well as off-shell Higgs boson production. It also presents interpretations in generic 2HDM models and in the hMSSM, and in the framework of an Effective Field Theory.

        Speaker: Yanping Huang
      • 11:18
        Studies of the CP properties of the Higgs boson at the ATLAS experiment 17m

        Studies of the CP properties of the Higgs boson in various production modes and decay channels are presented. Limits on the mixing of CP-even and CP-odd Higgs states are set by exploiting the properties of diverse final states.

        Speaker: William Leight (ATLAS (ATLAS Dark Matter with Higgs))
      • 11:35
        The JHU generator framework: EFT applications in Higgs physics 17m

        The JHUGenerator framework includes an event generator of all anomalous Higgs boson interactions in both production and decay and the MELA library for matrix element analyses. The framework also allows using dimension-six operators of an EFT in on-shell and off-shell production together with triple and quartic gauge boson interactions. One new feature is the JHUGenLexicon interface for relating the anomalous coupling formulation with popular EFT bases. Some of the new features are illustrated along with projections for experimental measurements with the full LHC and HL-LHC datasets.

        Speaker: Jeffrey Davis (Johns Hopkins University )
      • 11:52
        GeoSMEFT and applications [until 12:09, just shortened for agenda purposes] 8m

        I will discuss the geometric formulation of the SMEFT and its applications.

        Speaker: Tyler Corbett (NBI)
    • 10:00 12:00
      T10: Searches for New Physics: Part 1

      All talks in this session will be 12 mins + 3 mins for the discussion.

      Convener: Cristina Botta (University of Zurich)
      • 10:00
        Searches for strong production of supersymmetric particles with the ATLAS detector 15m

        Supersymmetry (SUSY) provides elegant solutions to several problems in the Standard Model, and searches for SUSY particles are an important component of the LHC physics program. Naturalness arguments for weak-scale supersymmetry favour supersymmetric partners of the gluons and third generation quarks with masses light enough to be produced at the LHC. This talk will present the latest results of searches conducted by the ATLAS experiment which target gluino and squark production, including stop and sbottom, in a variety of decay modes, focusing on decay modes in which R-parity is conserved and therefore the lightest SUSY particle is a stable dark matter candidate.

        Speaker: Jonathan Long (Urbana UI)
      • 10:15
        Searches for third generation SUSY particles with the CMS experiment 15m

        Several searches for supersymmetric partners of the top quark and tau lepton have been performed by the CMS Collaboration using the full dataset of proton-proton collisions collected during the Run 2 of the LHC at a center-of-mass energy of 13 TeV. The main features and results of these analyses will be presented.

        Speaker: Giulia Collura (UCSB)
      • 10:30
        Searches for electroweak production of supersymmetric particles with the ATLAS detector 15m

        The direct production of electroweak SUSY particles, including sleptons, charginos, and neutralinos, is a particularly interesting area of search at the LHC, as considerations on dark matter and the naturalness of the Higgs mass motivate the existence of light electroweakinos. The small production cross sections lead to difficult searches, despite relatively clean final states. This talk will highlight the most recent results of searches performed by the ATLAS experiment for supersymmetric particles produced via electroweak processes, including analyses targeting small mass splittings between SUSY particles, with a focus on searches that target models on which R-parity is conserved. Sophisticated analysis techniques, including machine learning, are employed to increase the sensitivity for these processes.

        Speaker: Stefano Zambito (CERN)
      • 10:45
        Search for electroweak SUSY production in leptonic and hadronic final states with the CMS experiment 15m

        Several searches for supersymmetry produced through electroweak processes have been performed by the CMS Collaboration using the full dataset of proton-proton collisions collected during the Run 2 of the LHC at a center-of-mass energy of 13 TeV. The main features and results of analyses that select events with leptonic and hadronic final states will be presented.

        Speaker: Liam Wezenbeek (UGent/ULB)
      • 11:00
        Constraining challenging regions of the SUSY parameter space with the CMS experiment 15m

        Supersymmetric models are characterized by a strong diversity of experimental signatures. Since general-purpose searches have not yet given any clear indication of new physics, dedicated methodologies and tools have been developed to target the regions of the parameter space where the analysis is most challenging and SUSY might still lie undetected. This presentation will describe relevant examples among searches performed by the CMS Collaboration using the full dataset of proton-proton collisions collected during the Run 2 of the LHC at a center-of-mass energy of 13 TeV.

        Speaker: Peter Eduard Meiring (Universitaet Zuerich (CH))
      • 11:15
        Exploring the frontier of R-parity-violating supersymmetry with the ATLAS detector 15m

        Supersymmetry models in which R-parity violation occurs predict a wide range of experimental signatures at the LHC, including many high-multiplicity final states without large missing transverse momentum. These models are motivated by the hierarchy problem and for some parameters naturally explain the lightness of the standard model neutrinos. Searches for RPV SUSY signatures require dedicated signal regions and innovative techniques to estimate the challenging backgrounds. This talk will highlight the latest results of searches conducted by the ATLAS experiment which target supersymmetric particles produced via both strong and electroweak processes in R-parity violating scenarios.

        Speaker: Michael Holzbock (Munich MPI)
      • 11:30
        New constraints on flavour violating supersymmetry 15m

        We present an update on the constraints on general MSSM scenarios with non-minimal sources of flavour violation (NMFV), including all theoretical constraints and the most recent experimental bounds.
        Using an MCMC algorithm and the public code SuperIso, we compute various flavour observables and the muon $(g-2)$ and impose the LHC direct search limits.
        We present an up-to-date calculation of the relevant observables, in particular those related to $b\to s ll$ transitions which manifest tensions with the SM predictions, and show the latest allowed NMFV parameter ranges, in light of the most recent experimental bounds.
        We finally discuss and propose a few benchmark scenarios for future BSM searches.

        Speaker: Mohamed Amine Boussejra (Lyon University)
      • 11:45
        New constraints on supersymmetry using neutrino telescopes 15m

        We introduce a new approach to set limits on long-lived charged particles using neutrino telescopes and apply it to data. Towards the horizon, we expect a suppression of low-energy muons and electrons, due to the amount of material they must traverse, to reach the detector. Should the new long-lived charged particle possess a larger mass than the muon, then its energy loss will be suppressed compared to the latter. This results in them being able to reach underground neutrino detectors from the horizon, while appearing as minimally ionizing tracks. The only expected background are low-energy muons produced by neutrinos near the detector.
        Using one year of public IceCube data this approach can set a lower mass bound of 320 GeV on the stau, which is predicted in some supersymmetric scenarios. Extending this methodology to ten years of data, we predict that IceCube can set a lower mass bound of 450 GeV, similar to current limits set by collider-based experiments. This opens the possibility of complimentary and competitive studies on new long-lived, charged particles using already existing and upcoming neutrino telescopes.

        Speaker: Stephan Meighen-Berger (Technical University Munich)
    • 10:00 12:00
      T12: Detector R&D and Data Handling: LHC Run 3
      Conveners: Magnus Mager (CERN) , Vincent Boudry (LLR – École polytechnique)
      • 10:00
        Triggering in ATLAS in Run 2 and Run 3 12m

        The ATLAS experiment at the LHC can record about 1 kHz of physics collisions, out of an LHC design bunch crossing rate of 40 MHz. To achieve a high selection efficiency for rare physics events while reducing the significant background rate, a two-level trigger system is used.

        The event selection is based on physics signatures, such as the presence of energetic leptons, photons, jets or missing energy. In addition, the trigger system can exploit algorithms using topological information and multivariate methods to carry out the filtering for the many physics analyses pursued by the ATLAS collaboration. In Run 2, around 1500 individual selection paths, the trigger chains, were used for data taking, each with specified rate and bandwidth assignments.

        We will give an overview of the Run-2 trigger menu and its performance, allowing the audience to get a taste of the broad physics program that the trigger is supporting. We present the tools that allow us to predict and optimize the trigger rates and CPU consumption for the anticipated LHC luminosities and outline the system to monitor deviations from the individual trigger target rates, and to quickly react to the changing LHC conditions and data taking scenarios.
        As an outlook to the upcoming ATLAS data-taking period in Run 3 from 2022 onwards, we present the design principles and ongoing implementation of the new trigger software within the multithreaded framework AthenaMT together with some outlook to the expected performance improvements.

        Speaker: Yasuyuki Okumura (University of Tokyo (JP))
      • 10:15
        CMS Tracker Alignment: Legacy results from LHC Run-II and Run-III prospects 12m

        The inner tracking system of the CMS experiment, which comprise of Silicon Pixel and Silicon Strip detectors, is designed to provide a precise measurement of the momentum of charged particles and to reconstruct the primary and secondary vertices. The movements of the different substructures of the tracker detectors driven by the operating conditions during data taking, require to regularly update the detector geometry in order to accurately describe position, orientation, and curvature of the tracker modules.

        The procedure in which new parameters of the tracker geometry are determined is known as alignment of the tracker. The alignment procedure is performed several times during data taking using reconstructed tracks from collisions and cosmic rays data, and later on, further refined after the data taking period is finished. The tracker alignment performance corresponding to the ultimate accuracy of the alignment calibration for the legacy reprocessing of the CMS Run-II data will be presented. The data-driven methods used to derive the alignment parameters and the set of validations that monitor the performance of physics observables after the alignment will be reviewed. Finally, the prospects for the alignment calibration during the upcoming run of the LHC, where more challenging operation conditions are expected, will be addressed.

        Speaker: Sandra Consuegra Rodriguez (CMS (CMS Fachgruppe HIGGS))
      • 10:30
        First results of the newly installed, MAPS based, ALICE Inner Tracking System 12m

        The ALICE Inner Tracking System (ITS) has recently been replaced with a full silicon-pixel detector constructed entirely with CMOS monolithic active pixel sensors. It consists of three inner layers (50 $\mu$m thick sensors) and four outer layers (100 $\mu$m thick sensors) covering 10 m$^2$ and containing 12.5 billion pixels with a pixel size of 27 $\mu$m x 29 $\mu$m. Its increased granularity, the very low material budget (0.35% X$_0$/layer in the inner barrel) as well as a small radius of the innermost layer combined with a thin beam pipe, will result in a significant improvement of impact-parameter resolution and tracking efficiency at low $p_{\rm T}$ with respect to the previous tracker. The assembly of the full detector and services finished in December 2019. A comprehensive commissioning phase (on surface) was completed in December 2020, including detector calibration, fake-hit rate determination, data transmission tests and preliminary evaluation of the detector efficiency and the sensors alignment, based on reconstruction of cosmic rays tracks. The commissioning of the ITS within the ALICE apparatus has recently started. After a first phase of standalone tests and detector performance optimization, the ITS will be included in the global commissioning activities in summer 2021. In this talk, the first results of the performance of the new ALICE ITS detector, studied during commissioning, will be presented.

        Speaker: Jian Liu
      • 10:45
        ATLAS LAr Calorimeter Commissioning for LHC Run-3 12m

        Liquid argon (LAr) sampling calorimeters are employed by ATLAS for all electromagnetic calorimetry in the pseudo-rapidity region |η| < 3.2, and for hadronic and forward calorimetry in the region from |η| = 1.5 to |η| = 4.9. After detector consolidation during a long shutdown, Run-2 started in 2015 and about 150 fb$^{-1}$ of data at a center-of-mass energy of 13 TeV was recorded. Phase-I detector upgrades began after the end of Run-2. New trigger readout electronics of the ATLAS Liquid-Argon Calorimeter have been developed. Installation began at the start of the LHC shut down in 2019 and is expected to be completed in 2021. A commissioning campaign is underway in order to realise the capabilities of the new, higher granularity and higher precision level-1 trigger hardware in Run-3 data taking. This contribution will give an overview of the new trigger readout commissioning, as well as the preparations for Run-3 detector operation.

        Speaker: Davide Pietro Mungo (Milano)
      • 11:00
        Run-3 offline data processing and analysis at LHCb 12m

        The LHCb detector is undergoing a comprehensive upgrade for data taking in the LHC's Run 3, which is scheduled to begin in 2022. The increased data rate in Run 3 poses significant data-processing and handling challenges for the LHCb experiment. The offline computing and dataflow model is consequently also being upgraded to cope with the factor 30 increase in data volume and associated demands of user-data samples of ever-increasing size. Coordinating these efforts is the charge of the newly created Data Processing and Analysis (DPA) project. The DPA project is responsible for ensuring the LHCb experiment can efficiently exploit the Run 3 data, dealing with the data from the online system with central skimming/slimming (a process known as "Sprucing") and subsequently producing analyst-level ntuples with a centrally managed production system (known as "Analysis Productions") utilising improved analysis tools and infrastructure for continuous integration and validation.It is a multi-disciplinary project involving collaboration between computing experts, trigger experts and physics analysis experts. This talk will present the evolution of the data processing model, followed by a review of the various activities of the DPA project. The associated computing, storage and network requirements are also discussed.

        Speaker: Nicola Skidmore
      • 11:15
        Track and Vertex reconstruction in ATLAS for LHC Run 3 and High-Luminosity phases 12m

        The determination of charged-particle trajectories (tracking) and the identification of primary collision vertices (vertexing) are complex parts of the event reconstruction chain in collider experiments and constitute the building blocks of most high level analysis objects. During the Run 2 data-taking in ATLAS, tracking was by far the most resource intensive step, for an average number of p-p collisions per bunch crossing (pile-up) ranging from 20 up to 60. The complexity of the combinatorial problem increases dramatically with pile-up and the physics performance degrades as more low-quality tracks with mis-assigned, missing or randomly combined hits are reconstructed.
        Averages of around 50 interactions per bunch-crossing are expected during the LHC Run 3, rising to about 200 during the High-Luminosity (HL) phase of the LHC, scheduled to start in about 5 years.
        In order to cope with these challenging conditions and to maintain the physics performance reached up to LHC Run 2, a major rewrite of the Run 3 reconstruction software was performed while ATLAS prepares for a replacement of the current ATLAS Inner Detector with a new all-silicon Inner Tracker (ITk) for HL-LHC.
        The Run 3 software improvements allowed to dramatically increase the reconstruction speed and pileup robustness. This included replacing the existing ATLAS vertexing with the pioneering use of elements of the ACTS software framework, which will become the backbone of ITk track reconstruction, in production.
        In this talk, the improvements achieved for the track and vertex reconstruction to be used in the upcoming LHC Run 3 as well as the latest results on the expected performance of the ITk tracking and of other high-level object identification will be presented.

        Speaker: Noemi Calace (CERN)
      • 11:30
        Status and commissioning of the new GE1/1 station for the CMS experiment 12m

        The upgrade of the Large Hadron Collider (LHC), with an increase of its luminosity up to 5-7 × 10^34cm^−2s^−1, will cause a huge growth of the background rates expected by the experiments. For this reason, the Compact Muon Solenoid (CMS) experiment is going through an upgrade project, which includes the installation of a new station, called GE1/1, consisting of 144 Triple-Gas Electron Multiplier detectors (GEM). The combined operation of the new GE1/1 station together with the existing Cathode Strip Chamber (CSC) station ME1/1 is expected to improve muon tracking and triggering performance. The installation of the GE1/1 station is complete and the commissioning phase is ongoing. We will present the status of this commissioning and the first results on the performance of the detectors and electronics. Plans for LHC Run 3 will also be discussed.

        Speaker: Davide Fiorina (University & INFN Pavia)
      • 11:45
        Status of the Fast Interaction Trigger detector for the ALICE upgrade 12m

        During the second Long Shutdown (LS2) of the LHC, ALICE is installing three new detectors and implementing continuous data readout with online reconstruction and data compression. The changes are needed to benefit from the increased luminosity of the LHC during Run 3 and 4. The ALICE interaction rate will increase by two orders of magnitude, reaching 50 kHz for Pb-Pb and up to 1 MHz for pp collisions.

        One of the new ALICE detectors is the Fast Interaction Trigger (FIT). Its main functionality includes generating minimum latency interaction triggers (<425 ns), luminosity monitoring with online feedback to the LHC, precision collision time with a resolution better than 40 ps, determination of the centrality and event plane for heavy-ion collisions, and tagging of diffractive and ultra-peripheral events. The FIT detector consists of three subsystems: two fast Cherenkov arrays with 2 cm thick quartz radiators coupled to modified MCP-PMT photosensors (FT0), a large-area scintillator disc (FV0) implementing a novel light collection system, and a Forward Diffractive Detector (FDD). FDD comprises two plastic scintillator arrays with fast wavelength shifting bars, optical fibre bundles, and PMTs. The FDD arrays are located ~20 m at the opposite sides of the interaction point. A brief description of the detector and its functionalities will be given together with the installation and commissioning status.

        Speaker: Solangel Rojas Torres (Czech Technical University in Prague (CZ))
    • 12:00 12:30
      Lunch Break 30m
    • 12:30 14:05
      Plenary: Welcome and Prize Session
      Convener: Thomas Gehrmann (University of Zurich)
    • 14:05 14:15
      Break 10m
    • 14:15 16:15
      T01: Astroparticle and Gravitational Waves: Part 2 (GW Theory)
      Convener: Diego Blas (KCL)
      • 14:15
        A hybrid simulation of gravitational wave production in first-order phase transitions 20m

        The LISA telescope will provide the first opportunity to probe the scenario of a first-order phase transition happening close to the electroweak scale. In thermal transitions, the main contribution to the GW spectrum comes from the sound waves propagating through the plasma. Current estimates of the GW spectrum are based on numerical simulations of a scalar field interacting with the plasma or on analytical approximations -- the so-called sound shell model. In this work we present a novel setup to calculate the GW spectra from sound waves. We use a hybrid method that uses a 1d simulation (with spherical symmetry) to evolve the velocity and enthalpy profiles of a single bubble after collision and embed it in a 3d realization of multiple bubble collisions, assuming linear superposition of the velocity and enthalpy. The main advantage of our method compared to 3d hydrodynamic simulations is that it does not require to resolve the scale of bubble wall thickness. This makes our simulations more economical and the only two relevant physical length scales that enter are the bubble size and the fluid shell thickness (that are in turn enclosed by the box size and the grid spacing). The reduced costs allow for extensive parameter studies and we provide a parametrization of the final GW spectrum as a function of the wall velocity and the fluid kinetic energy.

        Speaker: Henrique Rubira (T (Cosmology))
      • 14:35
        Modeling black hole binaries in scalar-tensor theories of gravity 20m

        I will discuss a new formulation of the Einstein equations and scalar tensor theories of gravity--the modified generalized harmonic (MGH) formulation--that allows for the stable, well-posed evolution of black holes in a wide variety of scalar-tensor theories. I will discuss recent progress in numerically modeling binary black hole evolution, and scalar+gravitational wave emission, in the scalar-tensor theory Einstein scalar Gauss-Bonnet gravity.

        Speaker: Justin Ripley (DAMPT, University of Cambridge)
      • 14:55
        Binary systems as dynamical detectors of gravitational waves 20m

        The passage of gravitational waves (GWs) through a binary perturbs the trajectories of the two bodies, potentially causing observable changes to their orbital parameters. In the presence of a stochastic GW background (SGWB) these changes accumulate over time, causing the binary orbit to execute a random walk through parameter space. In this talk I will present a powerful new formalism for calculating the full statistical evolution of a generic binary system in the presence of a SGWB, capturing all six of the binary's orbital parameters. I will show how this formalism can be applied to timing of binary pulsars and lunar laser ranging, thereby setting novel upper limits on the SGWB spectrum in a frequency band that is inaccessible to all other GW experiments.

        Speaker: Alex Jenkins (King's College London)
      • 15:15
        Measuring the dark matter environments of black hole binaries with gravitational waves 20m

        Black holes of astrophysical and primordial origin can compress their dark matter environments to extreme densities as they form and grow. This "dark dress" inevitably affects the dynamical evolution of binaries, and imprints a characteristic dephasing onto their gravitational waveforms that could be probed with upcoming interferometers. In this work, we study the prospects for detecting and characterizing the dark matter content of these systems with the Laser Interferometer Space Antenna (LISA). We introduce an analytical model for the dephasing of dark dresses motivated by the interplay between the gravitational wave emission and disruption of the dark matter halo that governs their evolution. We demonstrate that LISA could distinguishing dark dresses from standard black hole binaries and quantify how precisely their parameters could be measured. Through such measurements, future gravitational wave detectors could be a powerful tool for probing the particle nature of dark matter.

        Speaker: Adam Coogan (GRAPPA, University of Amsterdam)
      • 15:35
        Gravitational Waves as a Big Bang Thermometer 20m

        There is a guaranteed background of stochastic gravitational waves produced in the thermal plasma in the early universe. Its energy density per logarithmic frequency interval scales with the maximum temperature Tmax which the primordial plasma attained at the beginning of the standard hot big bang era. It peaks in the microwave range, at around 80 GHz [106.75/gs(Tmax)]^(1/3), where gs(Tmax) is the effective number of entropy degrees of freedom in the primordial plasma at Tmax. We present a state-of-the-art prediction of this Cosmic Gravitational Microwave Background (CGMB) for general models, and carry out calculations for the case of the Standard Model (SM) as well as for several of its extensions. On the side of minimal extensions we consider the Neutrino Minimal SM (νMSM) and the SM-Axion-Seesaw-Higgs portal inflation model (SMASH), which provide a complete and consistent cosmological history including inflation. As an example of a non-minimal extension of the SM we consider the Minimal Supersymmetric Standard Model (MSSM). Furthermore, we discuss the current upper limits and the prospects to detect the CGMB in laboratory experiments and thus measure the maximum temperature and the effective number of degrees of freedom at the beginning of the hot big bang.

        Speaker: Carlos Tamarit (Technische Universität München)
      • 15:55
        Probing the standard cosmological model with the population of binary black-holes 20m

        Gravitational-wave (GW) detections are rapidly increasing in number, enabling precise statistical analyses of the population of compact binaries. In this talk I will show how these population analyses cannot only serve to constrain the astrophysical formation channels, but also to learn about cosmology. The three key observables are the number of events as a function of luminosity distance, the stochastic GW background of unresolved binaries and the location of any feature in the source mass distribution, such as the expected pair instability supernova (PISN) gap. Given data from LIGO-Virgo observations, I will present constraints in cosmological modifications of gravity. I will also discuss future prospects on measuring $H_0$ given a possible population of black holes above the PISN gap. These novel tests of the standard cosmological model require GW data only and will become increasingly relevant as GW catalogs grow, specially if multi-messenger events remain elusive.

        Speaker: Jose María Ezquiaga (University of Chicago)
    • 14:15 16:15
      T03: Dark Matter: Part 2
      Convener: Elisabetta Baracchini (Gran Sasso Science Institute)
      • 14:15
        Results on Light Dark Matter investigation with CRESST-III 20m

        The CRESST (Cryogenic Rare Event Search with Superconducting Thermometers) experiment explores with high sensitivity the parameter space of low mass DM candidates, being the pathfinder in the sub-GeV/c^2 mass range. CRESST employs different high-purity crystals and operate them at mK temperature as cryogenic calorimeters The flexibility in employing detectors made of different materials together with the advanced performance of the thermal sensors allow CRESST-III to establish the most stringent limits on spin-dependent and spin-independent low mass DM interactions.

        In this contribution, the current stage of the CRESST-III experiment, together with the most recent dark matter results will be presented. The perspective for the next phase of the experiment will be also discussed.

        Speaker: Luca Pattavina (INFN - Laboratori Nazionali del Gran Sasso)
      • 14:55
        Dark Matter with DAMA/LIBRA 20m

        The recent results of DAMA/LIBRA–phase2 experiment deep underground at Gran Sasso are presented. The improved experimental configuration with respect to the phase1 allowed a lower software energy threshold. The DAMA/LIBRA–phase2 data confirm the evidence of a signal that meets all the requirements of the model independent Dark Matter annual modulation signature, at high C.L. The model independent DM annual modulation result is compatible with a wide set of DM candidates. In this talk we summarize some of them and perspectives for the future will be outlined.

        Speaker: Pierluigi Belli (INFN Roma Tor Vergata)
      • 15:15
        Annual modulation results from three-year exposure of ANAIS-112 20m

        DAMA/LIBRA observation of an annual modulation in the detection rate compatible with that expected for dark matter particles from the galactic halo has accumulated evidence for more than twenty years. It is the only hint about a positive identification of the dark matter, but it is in strong tension with the negative results of other very sensitive experiments. However, this comparison is model-dependent. By using the same target material than DAMA/LIBRA experiment, NaI(Tl), such a comparison is more direct and almost independent in dark matter particle and halo models. In this talk we will present the performance and prospects of ANAIS-112 experiment, which using 112.5 kg of NaI(Tl) as target, is taking data at the Canfranc Underground Laboratory in Spain since August 2017. Results corresponding to three-year exposure will be presented. These results are compatible with the absence of modulation and in tension with DAMA/LIBRA result. Moreover, they support our goal of reaching a 3σ sensitivity to the DAMA/LIBRA result with about 5 years of data.

        Speaker: María Luisa Sarsa (CAPA, University of Zaragoza)
      • 15:35
        COSINUS: a NaI-based experiment for Dark Matter search 20m

        The COSINUS (Cryogenic Observatory for SIgnals seen in Next-generation Underground Searches) project aims to provide a model-independent cross-check of the long-standing
        DAMA/LIBRA claim on the observation of dark matter.

        The use of sodium iodide (NaI) crystals, operated at cryogenic temperature as scintillating calorimeters, offers both a low energy threshold for nuclear recoils and the possibility to perform signal-to-background discrimination on an event-by-event basis thanks to the dual and independent read-out of both phonon and light signals.

        The construction of the COSINUS apparatus will begin in summer 2021 and the data taking will start in 2022.
        In this talk we will present the detection principle and the performance together with status and future prospects of the project.

        Speaker: Natalia Di Marco
      • 15:55
        Directional Dark Matter Search with NEWSdm 20m

        In spite of the extensive search for the detection of the dark matter (DM), experiments have so far yielded null results: they are probing lower and lower cross-section values and are touching the so-called neutrino floor. A way to possibly overcome the limitation of the neutrino floor is a directional sensitive approach: one of the most promising techniques for directional detection is nuclear emulsion technology with nanometric resolution. The NEWSdm experiment, located in the Gran Sasso underground laboratory in Italy, is based on novel nuclear emulsion acting both as the Weakly Interactive Massive Particle (WIMP) target and as the nanometric-accuracy tracking device. This would provide a powerful method of confirming the Galactic origin of the dark matter, thanks to the cutting-edge technology developed to readout sub-nanometric trajectories. In this talk we discuss the experiment design, its physics potential, the performance achieved in test beam measurements and the near-future plans. After the submission of a Letter of Intent, a new facility for emulsion handling was constructed in the Gran Sasso underground laboratory which is now under commissioning. A Conceptual Design Report is in preparation and will be submitted in Summer 2021.

        Speaker: Giovanni De Lellis
    • 14:15 16:15
      T04: Neutrino Physics: Low energy neutrinos
      Convener: Justyna Lagoda (NCBJ)
      • 14:15
        Joint measurement of the pure-U235 reactor antineutrino spectrum by STEREO and PROSPECT experiments 20m

        STEREO and PROSPECT are very short baseline experiments studying antineutrinos produced by highly-enriched nuclear fuel at the research facilities of Institut Laue-Langevin (Grenoble, France) and Oak Ridge National Laboratory (U.S.A.), respectively. Located at about 10 meters from the reactor cores, they investigate the data-to-prediction deficit called the « Reactor Antineutrino Anomaly » by looking for sterile neutrino oscillations and providing accurate measurements of the U235 antineutrino spectrum.

        In this talk I will present a joint analysis performed by the STEREO and PROSPECT collaborations. The two experimental energy spectra have been simultaneously unfolded to provide a reference spectrum in true antineutrino energy for the U235 isotope, achieving the highest precision for pure-U235 experiments. This new experimental reference will be compared to theoretical predictions in order to quantify the observed excess of events around 5 MeV. This measurement proves also to be complementary to the results from experiments using low-enriched nuclear fuel, such as Daya Bay, where several isotopes contribute to the antineutrino spectrum. In addition, I will present the status of the search for sterile neutrinos with the STEREO detector, including preliminary results with the full collected data set.

        Speaker: Matthieu Licciardi (LPSC-IN2P3, CNRS, Grenoble, France)
      • 14:35
        Latest Neutrino Oscillation Results from the Daya Bay Experiment 20m

        This talk will present the latest neutrino oscillation results from the Daya Bay experiment, which consists of eight functionally identical detectors in three experimental sites at different baselines from six 2.9 GW$_{\mathrm{th}}$ nuclear reactor cores. In 1958 days of operation, Daya Bay has collected the largest sample of inverse beta decay events to date, with close to 4 million candidate events. With improved systematics, Daya Bay has produced a world-leading measurement of the $\theta_{13}$ mixing angle and achieved comparable precision for $\Delta m^2_{32}$ to accelerator experiments. Along with the MINOS/MINOS+ and Bugey-3 experiments, Daya Bay has searched for oscillations to light sterile neutrinos, with no significant signal found. The most stringent limits to date have been placed on the $\theta_{\mu e}$ effective mixing angle over five orders of magnitude in the sterile mass-squared difference $\Delta m^2_{41}$, excluding the parameter space allowed by the LSND and MiniBooNE experiments at 90% CL$_\mathrm{S}$ for $\Delta m^2_{41} < 13~\mathrm{eV^2}$.

        Speaker: Roberto Mandujano (University of California, Irvine)
      • 14:55
        Neutrino oscillation physics in JUNO 20m

        Jiangmen Underground Neutrino Observatory, or JUNO, is a future multipurpose neutrino experiment currently being built in China. The data taking with a 20 kt detector, filled with liquid scintillator, will start soon. The main physics goals include estimation of the neutrino mass ordering (NMO) with significance of 3 standard deviations and measurement of neutrino oscillation parameters $\Delta m^2_{32}$, $\Delta m^2_{21}$, $\sin^2\theta_{12}$ with sub-percent precision. Both these measurements will be done based on the observation of electron antineutrino spectrum from multiple nuclear reactors at an average distance of 53 km.

        The talk covers the oscillation physics of the JUNO experiment, which is not limited to the reactor neutrino programme, owing to unprecedented energy resolution and large scale of the detector. The measurement of the solar neutrinos from $^8$B will enable JUNO to estimate $\Delta m^2_{21}$ with precision of 20\%, comparable to the current solar experiments. The atmospheric neutrino programme will provide a measurement of the mixing angle $\sin^2\theta_{23}$ and a complementary measurement of NMO. JUNO will be complemented with a satellite detector TAO located at a distance of 30 m from one of the nuclear power plants and will provide a reference measurement of reactor antineutrino spectrum with energy resolution of 2\% at 1 MeV. High energy resolution combined with a short baseline will enable TAO to provide leading constraints on sterile neutrino oscillations in a range of $10^{-2}$ eV$^2\leq\Delta m^2_{41}\leq$8 eV$^2$.

        Speaker: Maxim Gonchar (JINR)
      • 15:15
        JUNO potential in non-oscillation physics 20m

        The Jiangmen Underground Neutrino Observatory (JUNO) is a next-generation liquid scintillator experiment being built in Guangdong province in China. JUNO's target mass of 20 kton will be contained in a 35.4 m acrylic vessel, itself submerged in a water pool, under about 650 m of granite overburden. Surrounding the acrylic vessel are 17612 20'' PMTs and 25600 3'' PMTs. The main goal of JUNO, whose construction is scheduled for completion in 2022, is a 3-4$\sigma$ determination of the neutrino mass ordering (MO) using reactor neutrinos within six years, as well as a precise measurement of $\theta_{12}$, $\delta M_{21}^2$, and $\delta M_{31}^2$.
        JUNO's large target mass, low background, and dual calorimetry, leading to an excellent energy resolution and low threshold, allows for a rich physics program with many applications in neutrino physics. The large target mass will allow for high-statistics solar-, geo-, and atmospheric neutrino measurements. JUNO will also be able to measure neutrinos from galactic core-collapse supernovae, detecting about 10,000 events for a supernova at 10 kpc, and achieve a 3$\sigma$ discovery of the diffuse supernova neutrino background in ten years. It can also study non-standard interactions e.g. proton decay, indirect dark matter searches, and probe for lorentz invariance violations. This talk will cover this extensive range of non-oscillation topics on which JUNO will be able to shed light.

        Speaker: Alexandre Göttel (Forschungszentrum Jülich - Institute for Nuclear Physics, IKP-2 — RWTH Aachen University - Physics Institute III B)
      • 15:35
        Improved geoneutrinos observation with Borexino detector 20m

        Geoneutrinos, which are anti-neutrinos emitted from the decays of long-lived radioactive elements inside the Earth, are unique messengers of internal regions of our planet. The Borexino detector, located at Laboratori Nazionali del Gran Sasso in Italy, is able to detect the geoneutrinos through inverse beta decay reaction. This measurement is feasible thanks to the large scintillator target mass and unprecedented radiopurity, the long distance to nuclear reactors and the natural shielding provided by the Gran Sasso rock.

        In this talk, the most updated geoneutrino analysis will be presented, including data from December 2007 to April 2019. Thanks to an improved analysis with optimized data selection cuts, enlarged fiducial volume, and sophisticated cosmogenic veto, the dataset exposure is enhanced by a factor of two with respect to the previous Borexino measurement from 2015.

        The statistics increase, along with updated analysis techniques, allowed to measure the geoneutrinos flux with unprecedented precision level, also confirming the presence of a mantle signal. Fundamental geological information about our planet is inferred, as the Uranium and Thorium contents of the mantle, and the Earth radiogenic heat. Moreover, the existence of a possible georeactor located at the center of the Earth has been excluded at 95% C.L.

        Speaker: Davide Basilico (University of Milan / INFN Milano)
      • 15:55
        Experimental Evidence of neutrinos produced in the CNO fusion cycle in the Sun with Borexino 20m

        The proton-proton (pp) chain and the carbon-nitrogen-oxygen (CNO) fusion cycle process are two processes understood theoretically how stars converted hydrogen to helium. Neutrinos emitted in such processes are the only direct probe of the deep interior of the Sun. Borexino is a liquid scintillator detector targeted at measuring solar neutrinos. It is hosted by the underground INFN Laboratori Nazionali del Gran Sasso in L’Aquila, Italy and has achieved unprecedented radio purity of liquid scintillator. Since 2015, the Borexino has made a major effort in stabilizing the thermal condition of the detector aimed at measuring the CNO solar neutrinos, including installation of a passive thermal insulation system and an active temperature control system. It was observed that the movement of the Po-210 backgrounds was significantly suppressed and a low rate region in the center was stably present since 2016. After the Po-210 low-rate-region tracking method was improved, an upper limit of the Bi-210, the critical background of the CNO neutrino signal, was determined. Last fall, Borexino published in Nature the results excluding the absence of the CNO neutrino signal with a significance of five sigmas. The results quantify the relative contribution of CNO fusion in the Sun to be of the order of one percent. It is also the first experimental evidence of the CNO cycle process, the primary mechanism for the stellar conversion of hydrogen in the Universe. Additionally, solar models built from heliuseismoeogy (SSM-HZ) and from spectroscopy (SSM-LZ) predicted inconsistent solar metallicities, known as the “solar metallicity problem”. The CNO neutrino fluxes depend on the carbon and nitrogen abundances. So this work paves the way towards a direct measurement of the solar metallicity using CNO neutrinos. The details of the detector stabilization, the strategy to track the Po-210 low-rate-region, and the strategy to break the correlation between CNO neutrino signals and its backgrounds will be presented.

        Speaker: Xuefeng Ding (Gran Sasso Science Institute)
    • 14:15 16:15
      T05: Heavy Ion Physics: Part 2

      Note: All contributions are given 12 minutes + 3 min for questions

      • 14:15
        First LHCb results from PbPb collisions at 5.02 TeV 15m

        The LHCb detector is a full spectrometer at forward rapidity covering a pseudorapidity range of 2<eta<5. With its excellent vertex resolution, particle identification and tracking capability, the LHCb is able to perform precision measurements down to very low transverse momentum. We present first LHCb results on heavy flavor in lead-lead collisions at 5.02 TeV, including photoproduction of J/psi mesons in peripheral and ultra-peripheral collisions, and prompt open charm production, using the datasets collected during 2015 and 2018.

        Speaker: giulia manca (Università Cagliari & INFN)
      • 14:30
        Production and ratios of heavy hadrons from large to small collision systems with a coalescence plus fragmentation approach 15m

        Measurements of heavy baryon production in $pp$, $pA$ and $AA$ collisions from RHIC to top LHC energies have recently attracted more and more attention, currently representing a challenge for the heavy-quark hadronization theoretical understanding.
        The $\Lambda_c/D^0$ ratio observed in $AA$ collision at RHIC and LHC energies has a value of the order of the unity. The recent experimental measurements in $pp$ collisions at $\sqrt{s}=5.02 \,\rm TeV$ have shown a ratio of $\Lambda_c/D^0 \sim 0.6$, about one order of magnitude larger than that measured in $e^+e^-$, $ep$ collisions.
        We study the hadronization after the propagation of charm quarks in the quark-gluon plasma (QGP). The propagation is described by means of a relativistic Boltzmann transport approach where the non-perturbative interaction between heavy quarks and light quarks is described by means of a quasi-particle approach.
        In this talk we present a coalescence plus fragmentation model for the hadronization and the results obtained in $AA$ collisions for $D^0$, $D_s$, $\Lambda_c$ spectra and the related baryon to meson ratios at RHIC and LHC.
        We found a large $\Lambda_c$ production resulting in a baryon over meson ratio of order O(1). This large production has consequences for the D meson nuclear modification factor, that results dumped in the region of low momenta, as observed in STAR data.
        Furthermore we present, for the first time, results for these ratios in $pp$ collisions at top LHC energies assuming the formation of an hot QCD matter at finite temperature even for these systems.
        We calculate the heavy baryon/meson ratio and the $p_T$ spectra of charmed hadrons with and
        without strangeness content: $D^{0}$, $D_{s}$, $\Lambda_{c}^{+}$, $\Sigma_{c}$ and the recently measured $\Xi_c$ baryon, finding an enhancement in comparison with the ratio observed for $e^+e^-$, $ep$ collisions; moreover with this approach we predict also a significant production of $\Omega_c$ respect to $D^0$.

        [1] V. Minissale, S. Plumari and V. Greco, arXiv:2012.12001 [hep-ph].
        [2] S. Plumari, V. Minissale, S.K. Das, G. Coci and V. Greco, Eur.Phys.J. C 78 (2018) no.4, 348
        [3] F. Scardina, S. K. Das, V. Minissale, S. Plumari, V. Greco, Phys.Rev. C 96 (2017) no.4, 044905

        Speaker: Vincenzo Minissale (Università degli Studi di Catania - INFN LNS)
      • 14:45
        Quarkonia measurements in nucleus-nucleus collisions with ALICE 15m

        The production of quarkonia is one of the first proposed probes of the QGP properties in heavy-ion collisions. Since heavy quarks are produced during the early hard partonic collisions, they experience the entire evolution of the fireball. The suppression of quarkonium bound states by the free color charges of the dense deconfined medium, as well as the charmonium regeneration by (re)combination of charm quarks at the QGP phase boundary or through the fireball evolution, are sensitive to the medium properties. Furthermore, a modification of the quarkonium vector states polarization in Pb—Pb collisions with respect to pp collisions may give further insights on quarkonium suppression and regeneration mechanisms in the QGP. In addition, to the study of quarkonia in inelastic heavy-ion collisions, coherent photonuclear production of vector mesons can be studied by the virtue of the strong electromagnetic fields generated by ultrarelativistic heavy ions to infer information on the wave function of the nuclei that are crucial for the understanding of the initial state of heavy-ion collisions.

        In this contribution, we will report on the recent ALICE measurements of the nuclear modification factor $R_{\rm AA}$ of J/$\psi$ as a function of centrality/$p_{\rm T}$, and on final J/$\psi$ $v_2$ results, at both mid- and forward rapidity, using the full Run 2 Pb—Pb data sample ($\sqrt{s_{\rm NN}}$=5.02 TeV). The final results on 𝚼(1S) $R_{\rm AA}$ and $v_2$, 𝚼(2S) $R_{\rm AA}$, and J/$\psi$ $v_3$ measured at forward rapidity will also be shown. We will also report on the first measurement of the J/$\psi$ polarization in Pb—Pb collisions as a function of $p_{\rm T}$ and of the collision centrality, providing prospects for measurements as a function of the event plane. The aforementioned results will be compared and confronted to theoretical model predictions. Furthermore, we will discuss recent ALICE results on photonuclear production of $\rho$ and J/$\psi$ mesons in ultra-peripheral collisions.

        Speaker: Kunal Garg (SUBATECH)
      • 15:00
        Jet substructure measurements in heavy-ion collisions with ALICE 15m

        Jet substructure measurements, based on the distribution of constituents within a jet, are able to probe specific regions of QCD radiation phase space for jet showers in vacuum. This powerful capability provides new opportunities to study the dynamics of jet quenching in heavy-ion collisions and to help reveal the micro-structure of the quark-gluon plasma. The ALICE experiment is particularly well-suited for jet substructure measurements in heavy-ion collisions, due to its high-precision tracking system and focus on low transverse momentum jets. In this talk, we report several new jet substructure measurements in Pb-Pb collisions at $\sqrt{s_\rm{NN}}=5.02$ TeV by the ALICE Collaboration. These include the first fully corrected measurements of the groomed jet momentum fraction, $z_{g}$, and the groomed jet radius, $\theta_{g} \equiv R_{g}/R$, as well as the $N$-subjettiness distribution and the fragmentation distribution of reclustered subjets. The measurements will be compared to theoretical calculations and provide new constraints on the physics underlying jet quenching.

        Speaker: James Mulligan
      • 15:15
        Multi-partonic medium induced cascades in expanding media 15m

        Going beyond the simplified gluonic cascades, we have introduced both gluon and quark degrees of freedom for partonic cascades inside the medium. We then solve the set of coupled evolution equations numerically with splitting kernels calculated for exponential and Bjorken expanding media to arrive at medium-modified parton spectra for quark and gluon initiated jets respectively. Firstly, we have studied the inclusive jet $R_{AA}$ by including phenomenologically driven combinations of quark and gluon fractions inside a jet. The impact of the rapidity dependence of the jet $R_{AA}$ has been studied in detail. Secondly, we have studied the path-length dependence of jet quenching for different types of expanding media by calculating the jet $v_2$. Additionally, we have qualitatively studied the sensitivity of the time for the onset of the quenching for the Bjorken profile on jet $v_2$ and comparison with data from ATLAS.

        Speaker: Souvik Priyam Adhya (Institute of Particle and Nuclear Physics, Faculty of Mathematics and Physics, Charles University)
      • 15:30
        Quenching effects in the jet spectrum at various cone sizes 15m

        The strong suppression of high-pT jets in heavy-ion collisions is a result of elastic and inelastic energy loss, suffered by the jet multi-prong collection of color charges that are resolved by medium interactions. We develop a novel analytic framework to study the quenched jet spectrum in which we include many energy-loss-related effects, such as resummation of soft and hard medium induced emissions, broadening, elastic scattering, jet fragmentation, cone size, coherence effects, etc. We present the first predictions for the nuclear modification factor and the quantile procedure with cone size dependence. We compare dijet and boson+jet events to unfold the spectrum bias effects and improve quark-, and gluon-jet classification in heavy-ion jets. Besides pointing out its flexibility, we show our formalism relevance in pp jets modeling non-perturbative effects.

        The talk is based on arXiv:2101.01742 and arXiv:2103.14676

        Speaker: Adam Takacs (University of Bergen)
      • 15:45
        Exploring jet fragmentation using two-particle correlations with $\Lambda$ and K$^0_{\rm S}$ as trigger particles in pp and Pb–Pb collisions with ALICE 15m

        Complementary to jet reconstruction, two-particle correlations in $\Delta\eta$ and $\Delta\varphi$ are used to study jets, in particular their particle composition. While in Pb–Pb collisions this is done to characterize the quark–gluon plasma, pp and p–Pb collisions serve as a reference and are of interest on their own for their input into the understanding of particle production mechanisms. Recent ALICE results on the production of strange particles in small systems (pp and p–Pb collisions) reveal the possibility of having similar strange hadron production mechanisms in all collision systems. We present here a study of two-particle correlations triggered with strange hadrons (K$^0_{\rm S}$, $\Lambda$, $\bar{\Lambda}$) in pp collisions at 13 TeV and 5.02 TeV and in the most central Pb–Pb collisions at $\sqrt{s_{\rm NN}}=$ 5.02 TeV. The dependence of the per-trigger yields of primary charged hadrons on the transverse momenta of the trigger and associated particles, as well as on the event multiplicity, will be presented for both the near-side and away-side regions. Moreover, the ratios of these yields to the yields extracted from inclusive hadron-hadron correlations and the nuclear modification factor $I_{\rm AA}$ will be discussed. The results are compared among the three hadron species. In addition, a comparison to different Monte Carlo generators is presented, which allows us to better understand the strangeness production in jets.

        Speaker: Lucia Husova
      • 16:00
        Deep learning jet modifications in heavy-ion collisions 15m

        Jet interactions in a hot QCD medium created in heavy-ion collisions are conventionally assessed by measuring the modification of the distributions of jet observables with respect to the proton-proton baseline. However, the steeply falling production spectrum introduces a strong bias toward small energy losses that obfuscates a direct interpretation of the impact of medium effects in the measured jet ensemble. In this talk, we will explore the power of deep learning techniques to tackle this issue on a jet-by-jet basis.

        Toward this goal, we employ a convolutional neural network (CNN) to diagnose such modifications from jet images where the training and validation is performed using the hybrid strong/weak coupling model. By analyzing measured jets in heavy-ion collisions, we extract the original jet transverse momentum, i.e., the transverse momentum of an identical jet that did not pass through a medium, in terms of an energy loss ratio. Despite many sources of fluctuations, we achieve good performance and put emphasis on the interpretability of our results. We observe that the angular distribution of soft particles in the jet cone and their relative contribution to the total jet energy contain significant discriminating power, which can be exploited to tailor observables that provide a good estimate of the energy loss ratio.

        With a well-predicted energy loss ratio, we study a set of jet observables to estimate their sensitivity to bias effects and reveal their medium modifications when compared to a more equivalent jet population, i.e., a set of jets with similar initial energy. Then, we show how this new technique provides unique access to the initial configuration of jets over the transverse plane of the nuclear collision, both with respect to their production point and initial orientation. Finally, we demonstrate the capability of our new method to locate with unprecedented precision the production point of a dijet pair in the nuclear overlap region, in what constitutes an important step forward towards the long term quest of using jets as tomographic probes of the quark-gluon plasma.

        [1] Yi-Lun Du, Daniel Pablos, Konrad Tywoniuk, Deep learning jet modifications in heavy-ion collisions, arXiv:2012.07797 [hep-ph], JHEP. 2021, 206 (2021)

        Speaker: YILUN DU (University of Bergen)
    • 14:15 16:20
      T06: QCD and Hadronic Physics: Part 2: Jets

      Note: All contributions are given 12 minutes + 3 min for questions

      Convener: Mateusz Dyndal (AGH UST Krakow)
      • 14:15
        Precision measurements of jet production at the ATLAS experiment 15m

        Measurements of jet production are sensitive to the strong coupling constant, high order perturbative calculations and parton distribution functions. In this talk we present the most recent ATLAS measurements in this area at a centre-of-mass energy of sqrt(s) = 13 TeV. We present measurements of variables probing the properties of the multijet energy flow and of the Lund Plane using charged particles. We will also present new measurements sensitive to the strong coupling constant. All of the measurements are corrected for detector effects and are compared to the predictions of state-of-the-art Monte Carlo event generators.

        Speaker: mario campanelli (UCL)
      • 14:30
        Recent jet measurements in CMS 15m

        Measurement of inclusive jet cross sections in proton collisions at 5 and 13 TeV with the CMS experiment are presented. Measurements are performed as a function of the jet transverse momentum pT and jet rapidity. Jets are reconstructed using the anti-kT clustering algorithm with different size parameters in a wide phase space region in jet pT and jet rapidity. The measured jet cross sections are corrected for detector effects and compared with the predictions from perturbative QCD.

        Speaker: Patrick Connor (Uni Hamburg (Institut fur Experimentalphysik & CDCS))
      • 14:45
        Groomed jet mass in lepton collisions at high precision 15m

        We present predictions of the distribution of groomed heavy jet mass in electron-positron collisions at the next-to-next-to-leading order accuracy matched with the resummation of large logarithms to next-to-next-to-next-to-leading logarithmic accuracy. Resummation at this accuracy is possible through extraction of necessary two-loop constants and three-loop anomalous dimensions from fixed-order codes. The talk will be based on published papers on arXiv: 2002.00942 and 2002.05730.

        Speaker: Zoltan Trocsanyi (ELTE Eotvos Lorand University)
      • 15:00
        Measurement of the primary Lund jet plane density in pp collisions at $\sqrt{s} = \rm{13}$ TeV with ALICE 15m

        Precision measurements of jet substructure are used as a probe of fundamental QCD processes. The primary Lund jet plane density is a two-dimensional visual representation of the radiation off the primary emitter within the jet that can be used to isolate different regions of the QCD phase space.
        A new measurement of the primary Lund plane density for inclusive charged-particle jets in the transverse momentum range of $20 \leq p_{\rm{T,jet}}^{\rm ch} \leq 120$ GeV$/c$ in pp collisions at $\sqrt{s} =$ 13 TeV with the ALICE detector will be presented. This is the first measurement of the Lund plane density in an intermediate jet $p_{\rm T}$ range where hadronization and underlying event effects play a dominant role. The projections of the Lund plane density onto the splitting scale $k_{\rm{T}}$ and splitting angle $\theta$ axis are shown, highlighting the perturbative/non-perturbative and wide/narrow angle regions of the splitting phase space. Through a 3D unfolding procedure, the Lund plane density is corrected for detector effects which allows for quantitative comparisons to MC generators to provide insight into how well generators describe different features of the parton shower and hadronization.

        Speaker: Laura Havener
      • 15:15
        Jet substructure measurements in CMS 15m

        Various measurements related to the study of hadronic jets substructure in proton collisions at 13 TeV with the CMS experiment are presented. The differential jet production cross section as a function of the jet mass and transverse momentum is shown in events with a Z boson plus jet topology, with and without the soft radiation within a jet removed by a jet grooming algorithm. Measurement of jet substructure observables describing the distribution of particles within quark- and gluon-initiated jets, are carried out with both dijet and Z plus jet event samples. The cross section of hadronically decaying W/Z bosons identified using jets with a large cone radius at large transverse momenta together with jet substructure identification criteria, are also presented.

        Speaker: Suman Chatterjee (Austrian Academy of Sciences (AT))
      • 15:30
        Jet substructure measurements in proton-proton collisions with ALICE 15m

        Jets can be used to test our understanding of quantum chromodynamics (QCD). Specifically, jet-substructure observables measured in proton-proton (pp) collisions constrain perturbative (p)QCD calculations, as well as non-perturbative physics effects such as hadronization, and serve as a baseline to compare to measurements in heavy-ion collisions, where a deconfined state of matter is expected to be formed. The significant scale difference between the parton
        from the hard-scattering process and the hadrons measured in the detector creates a large phase space for the jet formation and evolution. Consequently, no single measurement can fully constrain the jet behavior, and a suite of observables needs to be studied simultaneously. In this talk we present an overview of recent charged-jet substructure and jet shape measurements from pp collisions in ALICE, including generalized angularities of groomed and inclusive jets, angular distances between different jet axes, and the radial distributions of heavy-flavour jets identified by the presence of a D$^0$ meson or $\Lambda_{c}$ baryon among its constituents. An iterative declustering technique is also used to trace all branching of the charm quark revealing the dead-cone effect for the first time in hadronic collisions. These new results provide new insights into the evolution of jets by comparing our measurements to predictions from different event generators and pQCD calculations.

        Speaker: Vit Kucera (CERN)
      • 15:45
        Measurement of 1-jettiness in deep-inelastic scattering at HERA 15m

        A first measurement of the 1-jettiness event shape observable in neutral-current deep-inelastic electron-proton scattering is presented. The 1-jettiness observable $\tau^1_b$ is defined such that it is equivalent to the thrust observable in the Breit frame, following momentum conservation. The data were taken with the H1 detector at the HERA $ep$ collider at a center-of-mass energy of 319 GeV in the years 2003 to 2007 and correspond to an integrated luminosity of about 351pb$^{-1}$. The triple-differential cross sections are presented as a function of the 1-jettiness $\tau^1_b$, the event virtuality $Q^2$ and the Bjorken-variable $x_\text{Bj}$ in the kinematic region $Q^2>150$\,GeV$^2$. The data have high sensitivity to the parton distribution functions of the proton, the strong coupling constant and to resummation and hadronisation effects. The data are compared to selected predictions.

        Speaker: Johannes Hessler (ATLAS (LHC Experiment ATLAS))
      • 16:00
        QCD jet production at a high energy muon collider 15m

        After the triumph of discovering the Higgs boson at the CERN Large Hadron Collider, people are getting increasingly interested in studying the Higgs properties in detail and searching for the physics beyond the Standard Model (SM). A multi-TeV lepton collider provides a clean experimental environment for both the Higgs precision measurements and the discovery of new particles. In high-energy leptonic collisions, the collinear splittings of the leptons and electroweak (EW) gauge bosons are the dominant phenomena, which could be well described by the parton picture. In the parton picture, all the SM particles should be treated as partons that radiated off the beam particles, and the electroweak parton distribution functions (EW PDFs) should be adopted as a proper description for partonic collisions of the initial states. In our work, both the EW and the QCD sectors are included in the Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) formalism to perturbatively resum the potential large logarithms emerging from the initial-state radiation (ISR). I will show the results of QCD jet production as well as some other typical SM processes at a possible high-energy electron-positron collider and a possible high-energy muon collider obtained using the PDFs.

        Speaker: Yang Ma (University of Pittsburgh)
    • 14:15 16:15
      T07: Top and Electroweak Physics: Part 2

      20 Minutes talks are meant as 15'+5'
      15 Minutes talks are meant as 12'+3'

      Conveners: Alexander Grohsjean (CMS (CMS Fachgruppe TOP)) , Eleni Vryonidou
      • 14:15
        Measurements of top quark pair production cross sections with the ATLAS detector at the LHC 15m

        Comprehensive measurements of inclusive and differential cross-sections for top-quark production are presented. The cross section for production of top-quark-antiquark pair is measured in the dilepon, lepton+jets and all-hadronic channels as function of kinematic properties the top quarks and of their final decay products, also including final states featuring top quarks with high transverse momenta compared to the top quark mass.
        Measurements use data from LHC proton-proton collisions recorded during the entire Run2 at both 13 and 5 TeV center-of-mass energy.
        The differential measurements are compared quantitatively to several setups of next-to-leading order matrix-element generators combined with parton-shower generators.

        Speaker: Federica Fabbri
      • 14:30
        Inclusive and differential ttbar cross-section measurements at CMS 15m

        Latest CMS measurements of top quark pair production, inclusive and/or differential is presented. Boosted regime is included in this talk.

        Speaker: Javier Fernandez (Universidad de Oviedo - ICTEA)
      • 14:45
        Top pair production at NNLO matched to parton showers 15m

        We present the first matched computation of top-quark pair production at next-to-next-to-leading order (NNLO) in QCD with all-order radiative corrections as implemented via parton-shower (PS) simulations. This result has been obtained by constructing the MiNNLOPS method for the production of heavy quarks, which constitutes the first NNLO+PS prediction for reactions with colour charges in the final state in hadronic collisions. Our results are of crucial importance for LHC phenomenology, while also representing an important step towards the NNLO+PS simulation of other hadronic processes with colour charges in the final state.

        Speaker: Javier Mazzitelli
      • 15:00
        Top-quark production at approximate N3LO 15m

        I discuss recent theoretical results with soft-gluon corrections for various top-quark production processes through approximate N3LO, including soft anomalous dimensions through three loops. I present numerical results for total cross sections as well as single- and double-differential distributions for top-pair and various single-top processes, including three-particle final states, and I show that soft-gluon corrections are dominant for a large range of collider energies.

        Speaker: Nikolaos Kidonakis (Kennesaw State University)
      • 15:15
        Testing the Standard Model in boosted top quark production with the ATLAS experiment at the LHC 15m

        Measurements in boosted top quark production test the Standard Model in a previously unexplored regime with a strongly enhanced sensitivity to high-scale new phenomena. Dedicated techniques have been developed to reconstruct and identify boosted top quarks. In this contribution measurements of the ATLAS experiment are presented of the differential cross section and asymmetries in this extreme kinematic regime. The measurements are interpreted within the Standard Model Effective Field Theory, yielding stringent bounds on the Wilson coefficients of two-light-quark-two-quark operators.

        Speaker: Peter Berta (Charles University, Prague)
      • 15:30
        Measurements of single top quark production cross sections with the ATLAS detector at the LHC 15m

        The inclusive cross section for production of a single top quark production in association with a W boson is measured in both the dilepton and in the lepton+jets final state. Events are are selected requiring two (one) charged leptons and one or two (at least three) jets with at most two (one) jets (jet) identified as containing b hadrons. Multivariate discriminants are constructed to separate the tW signal from the dominant top-quark pair̄ background. Measurements use data from LHC proton-proton collisions recorded during Run2 at both 13 and 8 TeV center-of-mass energy

        Speaker: Rui Zhang
      • 15:45
        CMS results of top quark electroweak production, including associated productions 15m

        Latest CMS measurements of single top quark, inclusive and/or differential is presented. The talk also covers single top production in association with additional bosons.

        Speaker: Luka Lambrecht (Ghent University (BE))
      • 16:00
        Soft Gluon Resummation for the Associated Single Top and Higgs Production at the LHC 15m

        Processes involving the Higgs boson and the top quark are of high interest in searches for BSM physics because they allow to directly measure the top Yukawa coupling. Although it has a relatively small cross section, the single top and Higgs production process pp → Htj is particularly sensitive to new physics, calling for precise theoretical predictions. For many processes at the LHC, a reduction of theoretical uncertainties can be achieved by means of resummation techniques, accounting for large logarithmic corrections, which originate from soft gluon emissions. In this talk, we discuss extending the precision with which theoretical predictions for the s-channel tHj production are known from NLO (next-to-leading order) to NLO+NLL (next-to-leading logarithmic matched to NLO) accuracy.

        Speaker: Laura Moreno Valero (Westfälische Wilhelms Universität Münster)
    • 14:15 16:15
      T08: Flavour Physics and CP Violation: Part 2
      Conveners: Francesco Dettori (Università degli Studi di Cagliari) , Trabelsi Karim (BELLE (BELLE II Experiment))
      • 14:15
        CP violation in charmless 2-body B meson decays at LHCb 15m

        Measurements of CP asymmetries in charmless two-body B-meson decays can be a powerful way to provide stringent tests of the Standard Model. In particular a longstanding anomaly in the CP asymmetries of B decays to a kaon and a pion, known as the K$\pi$ puzzle, can be a hint of physics beyond the Standard Model. We present new results from the analyses of charmless 2-body B decays with kaons and pions in the final state at LHCb.

        Speaker: Thomas Grammatico (LPNHE)
      • 14:30
        NNLO QCD corrections to B-meson mixing 15m

        The flavor mixing parameter $\Delta \Gamma_{12}^s$ that governs the lifetime differences of neutral $B_s$ mesons suffers from large uncertainties related to the uncalculated perturbative corrections. In this talk I will present new results on the previously unknown NNLO QCD corrections to the $B_s - \bar{B}_s$ mixing process that lead to a reduction of theoretical errors on $\Delta \Gamma_{12}^s$. To this end, we perform a fully analytic evaluation of the current-current correlators at 3 loops, as well as the current-penguin and current-chromomagnetic correlators at 2 loops in the $\Delta B = 1$ effective Hamiltonian. Some interesting aspects of this calculation to be addressed in my talk involve higher-order matching between two effective field theories ($\mathcal{H}_{\textrm{eff}}^{\Delta B = 1}$ and $\mathcal{H}_{\textrm{eff}}^{\Delta B = 2}$), dedicated treatment of evanescent operators in the presence of dimensionally regulated IR divergences, asymptotic expansion of the amplitudes in $m_c/m_b$ up to $\mathcal{O}(m_c^2)$ and the analytic evaluation of the resulting 3-loop on-shell integrals with one mass scale.

        Speaker: Vladyslav Shtabovenko (KIT)
      • 14:45
        Beauty to open charm final states at LHCb 15m

        The latest studies of beauty meson decays to open charm final states from LHCb are presented. Several first observations and branching fraction measurements using Run 1 and Run 2 data samples are shown. These decay modes will provide important inputs to other analyses, and may be used for future measurements of CP violation.

        Speaker: Fionn Bishop (Cavendish Laboratory, University of Cambridge)
      • 15:00
        Probing squared four-fermion operators of SMEFT with meson-mixing 15m

        The Standard Model Effective Field Theory (SMEFT) is a universal way of probing New Physics (NP) manifesting as new, heavy particle interactions with the Standard Model degrees of freedom, that respect the SM gauged symmetries. Higher order terms in the NP interactions possibly lead to large effects, mandatory for meaningful phenomenological studies, such as contributions to neutral meson-mixing, which typically pushes the scale of NP to energy scales much beyond the reach of direct searches in colliders. I discuss for the first time the leading-order renormalization of double-insertions of dimension-6 four-fermion operators that change quark flavor by one unit (i.e., $ | \Delta F | = 1 $, $ F = $ strange-, charm-, or bottom-flavor) by dimension-8 operators relevant for meson-mixing (i.e., $ | \Delta F | = 2 $) in SMEFT, and consider the phenomenological implications of contributions proportional to relatively large Yukawas. Given the underlying interest of SMEFT to encode full-fledged models at low-energies, this work stresses the need of considering dimension-8 operators in phenomenological applications of dimension-6 operators of SMEFT.

        Speaker: Luiz Vale Silva
      • 15:15
        Measurements of $B\to D^{(*)}K$ and $B\to D^{(*)}\pi$ related to the determination of $\gamma$ at Belle II 15m

        he CKM angle $\gamma$ ($\phi_3$) of the unitarity triangle is the only one that is accessible with tree-level decays in a theoretically clean way. The key method to measure $\gamma$ is through the interference between $B^+\to D^0 K^+$ and $B^+ \to \bar D^0 K^+$ decays that occurs if the final state of the charm-meson decay is accessible to both the $D^0$ and $\bar D^0$ mesons. The Belle II experiment at the SuperKEKB energy-asymmetric $e^+ e^-$ collider is a substantial upgrade of the B factory facility at the Japanese KEK laboratory. Belle II experiment aims to record 50 ab$^{-1}$ of data, a factor of 50 more than its predecessor. With the ultimate Belle II data sample of 50 ab$^-1$, a determination of $\gamma$ with a precision of 1 degree or better is foreseen. Main operation of SuperKEKB started in March 2019 and results from the full available Belle II data set, which corresponds to approximately 100~fb$^{-1}$, will be presented. The ratios of decay rates of $\Gamma(B^-\to D^{(*)0}K^-)/\Gamma(B^-\to D^{(*)0}\pi^-)$ and $\Gamma(\bar{B}^0\to D^{(*)+}K^-)/\Gamma(\bar{B}^0\to D^{(*)+}\pi^-)$ are measured. In addition, more detailed studies of $B^{-}\to D(K_{\rm S}^0\pi^{+}\pi^{-})K^-$, $B^{-}\to D(K_{\rm S}^0\pi^{0})K^-$ and $B^{-}\to D^{*0}(D^0\pi^0)K^-$ decays are described; these modes are key to the accurate determination of $\gamma$ at Belle II.

        Speaker: Benedikt Wach (BELLE (BELLE II Experiment))
      • 15:30
        ATLAS measurements of CP violation with beauty mesons 15m

        The ATLAS experiment has performed measurements of mixing and CP violation in the neutral B meson systems.
        This talk will focus on the latest results from the ATLAS collaboration on CP violation in the B_s^0 —> J/psi phi decays.
        Standard Model predicts the CP violating mixing phase, phi_s, to be very small and its SM value is very well constrained,
        while in many new physics models large phi_s values are expected. Latest measurements of phi_s and several other parameters
        describing the B_s^0 —> J/psi phi decays will be reported.

        Speaker: Radek Novotny (UNM)
      • 15:45
        Charmless three-body decays at LHCb 15m

        Short and long-distance dynamics along with a sizeable effective weak phase caused by the interference between tree and penguin amplitudes in charmless 3-body B decays leads to a rich structure of CP violation as a function of the phase space. We present the latest studies with charmless $B \to 3h$ decays at LHCb, including CP asymmetries and branching fractions

        Speaker: Lais Soares Lavra (Laboratoire de Physique de Clermont)
      • 16:00
        Light hyperon physics at BESIII 15m

        The BESIII experiment at the electron positron collider BEPCII in Beijing is successfully operating since 2008 and has collected large data samples in the tau-mass region, including the world’s largest data samples at the J/ψandψ(2S) resonances. The recent observations of hyperon polarizations at BESIII, which opens a new window for searching new physics beyond the SM, also attracts both experimental and theoretical attentions. In this presentation recent results on hyperon physics achieved at BESIII will be highlighted.

        Speaker: Viktor Thorén (Uppsala University)
    • 14:15 16:15
      T09: Higgs Physics: Precision - part 2 / Yukawa - part 1
      Conveners: Giovanni Marchiori (APC Paris - CNRS/IN2P3 and Université de Paris) , meng xiao (zhejiang university) , Michael Trott (NBI) , Sarah Heim (DESY)
      • 14:15
        Higgs-plus-jet differential distributions as stabilizers of the high-energy resummation 17m

        We investigate the inclusive hadroproduction of a Higgs boson in association with a jet, featuring large transverse momenta and separated by a large rapidity distance. We propose this reaction, that can be studied at the LHC as well as at new-generation colliding machines, as a novel probe channel for the manifestation of the Balitsky-Fadin-Kuraev-Lipatov (BFKL) dynamics. We bring evidence that high-energy resummed distributions in rapidity and transverse momentum exhibit a solid stability under higher-order corrections, thus offering us a faultless chance to gauge the feasibility of precision calculations of these observables at high energies. We come out with the message that future, exhaustive analyses of the inclusive Higgs-boson production, would benefit from the inclusion of high-energy effects in a multi-lateral formalism where distinct resummations are concurrently embodied. We propose these studies with the aim of inspiring synergies with other Communities, and pursuing the goal of widening common horizons in the exploration of the Higgs-physics sector.

        Speaker: Francesco Giovanni Celiberto (ECT*/FBK Trento & INFN-TIFPA)
      • 14:32
        Precise predictions of the mass of the discovered Higgs boson in supersymmetric scenarios 17m

        The mass of the discovered Higgs boson is one of its most precisely measured properties with an experimental accuracy at the sub-percent level. Besides its coupling behaviour, which conforms so far with the prediction of the Standard Model, the measured Higgs mass value can place strong constraints on extensions of the Standard Model, in particular supersymmetric ones. To fully exploit this experimental accuracy, a very precise prediction of the mass of the Standard Model-like Higgs boson in the respective model is required.

        In this talk, I will comment on different methods to calculate the mass and present some recent developments in the effort of improving the predictions within supersymmetric extensions of the Standard Model. In particular, I will consider scenarios with heavy supersymmetric partner particles but relatively light Higgs bosons with and without CP-violation.

        Speaker: Heidi Rzehak (University of Tübingen)
      • 14:49
        Measurements and interpretations of Higgs boson production using decays to two b-quarks with the ATLAS detector 17m

        Testing the couplings of the Higgs boson to quarks is important to understand the origin of quark masses. The talk presents Simplified Template Cross Section measurements for Higgs boson production in association with a vector boson using decays to two b quarks using pp collision data collected at 13 TeV, along with an interpretation in an Effective Field Theory framework. A search for vector-boson fusion production in the same Higgs decay channel will also be presented.

        Speaker: Karol Krizka (Lawrence Berkeley National Laboratory)
      • 15:06
        Higgs boson coupling to second generation fermions with the ATLAS detector 17m

        Searches for Higgs boson decays to two second-generation quarks or leptons, based on 13 TeV pp collision data, are presented, as well as indirect constraint of the Yukawa coupling of the Higgs boson to the charm quark.

        Speaker: Marko Stamenkovic (Nikhef)
      • 15:23
        Measurements of Higgs production and decay in final states involving quarks (CMS) 17m

        The latests CMS results collected at a centre-of-mass energy of 13 TeV and focusing on Higgs boson production and decay in final states involving quarks (ttH, tH, VH Hbb, VH Hcc) will be discussed.

        Speaker: Aliya Nigamova (University of Hamburg)
      • 15:40
        The h(125) decays to c cbar, b bbar, b sbar, photon photon and gluon gluon in the light of the MSSM with quark flavor violation 17m

        We study the Higgs boson decays h -> c cbar, b bbar, b sbar, photon photon
        and gluon gluon in the Minimal Supersymmetric Standard Model (MSSM) with
        general quark flavor violation (QFV), identifying the h with the Higgs boson
        with a mass of 125 GeV. We compute the widths of the h decays to c cbar,
        b bbar, b sbar (s bbar) at full one-loop level in the MSSM with QFV.
        For the h decays to photon photon and gluon gluon we compute the widths
        at NLO QCD level. We perform a MSSM parameter scan respecting theoretical
        constraints from vacuum stability conditions and experimental constraints,
        such as those from K- and B-meson data and electroweak precision data, as
        well as recent limits on Supersymmetric (SUSY) particle masses and the
        125 GeV Higgs boson data from LHC experiments.

        From the parameter scan, we find the followings:

        (1) DEV(h -> c cbar) and DEV(h -> b bbar) can be very large simultaneously:
        DEV(h -> c cbar) can be as large as ~ +/-60% and
        DEV(h -> b bbar) can be as large as ~ +/-20%.
        Here DEV(h -> X Y) is the deviation of the decay width Gamma(h -> X Y)
        in the MSSM from the SM prediction:
        DEV(h -> X Y) = Gamma(h -> X Y)_MSSM / Gamma(h -> X Y)_SM - 1.

        (2) The QFV decay branching ratio BR(h -> b sbar / bbar s) can be as
        large as about 0.17% in the MSSM. It is almost zero in the SM.
        The sensitivity of ILC(250 + 500 + 1000) to this decay BR could be
        about 0.1% at 4 sigma signal significance.

        (3) DEV(h -> photon photon) and DEV(h -> gluon gluon) can be large
        simultaneously: DEV(h -> photon photon) can be as large as about + 4% and
        DEV(h -> gluon gluon) can be as large as about -15%.

        (4) There is a very strong correlation between DEV(h -> photon photon)
        and DEV(h -> gluon gluon). This correlation is due to the fact that the
        stop-loop (stop-scharm mixture loop) contributions dominate the two DEVs.

        (5) The deviation of the width ratio Gamma(h -> photon photon)/Gamma(h ->
        gluon gluon) in the MSSM from the SM value can be as large as about +20%.

        (6) All of these large deviations in the h decays are due to large
        scharm-stop mixing and large stop/scharm involved trilinear couplings
        T_{U23}, T_{U32}, T_{U33} and large sstrange-sbottom mixing and large
        sstrange/sbottom involved trilinear couplings T_{D23}, T_{D32}, T_{D33}.

        (7) ILC can observe such large deviations from SM at high signal significance.

        (8) In case the deviation pattern shown here is really observed at ILC,
        then it would strongly suggest the discovery of QFV SUSY (MSSM with QFV).

        Note: This work is based on collaboration with H. Eberl and E. Ginina (HEPHY Vienna).

        References:
        Phys. Rev. D 91 (2015) 015007 [arXiv:1411.2840 [hep-ph]]
        JHEP 1606 (2016) 143 [arXiv:1604.02366 [hep-ph]]
        IJMP A34 (2019) 1950120 [arXiv:1812.08010 [hep-ph]]

        Speaker: Keisho Hidaka (Tokyo Gakugei University)
      • 15:57
        Resurrecting bbh with Machine Learning Magic 17m

        The associated production of a $b\bar{b}$ pair with a Higgs boson could provide an important probe to both the size and the phase of the bottom-quark Yukawa coupling, $y_b$. However, the signal is shrouded by several irreducible background processes. We show that the analysis of kinematic shapes provides us with a concrete prescription for separating the $y_b$-sensitive production modes from both the irreducible and the QCD-QED backgrounds in the $b\bar{b}\gamma\gamma$ final state. We draw a page from game theory and use Shapley values to make Boosted Decision Trees interpretable in terms of kinematic measurables and provide physics insights into the variances in the kinematic shapes of the different channels that help us complete this feat. Adding interpretability to the machine learning algorithm opens up the black-box and allows us to pick and interpret upon kinematic variables that matter most in the analysis. We resurrect the hope of constraining the size and, possibly, the phase of $y_b$ using kinematic shape studies of $b\bar{b}h$ production with the full HL-LHC data and at FCC-hh.

        Speaker: Zhuoni Qian (DESY)
    • 14:15 16:15
      T10: Searches for New Physics: Part 2

      All talks in this session will be 12 mins + 3 mins for the discussion.

      Convener: Marija Vranjes Milosavljevic (Institute of Physics Belgrade)
      • 14:15
        Search for invisible decays at BESIII 15m

        BESIII has collected 448.2 M $\psi(3686)$ data set and 10 B $J/\psi$ data set. The huge clean data sample provide an excellent chance to search for new physics. We report the search for decay $J/\psi\to\gamma + invisible$, which is predicted by next-to-minimal supersymmetric model. Without significant signal found, we gave around 6.2 times better upper limits than previous CLEO-c’s results. In addition, we report the preliminary result of the first search for the invisible decay of $\Lambda$. This invisible decay is predicted by the mirror matter model which could explain the $4\sigma$ discrepancy in neutron lifetime measurement results from the beam method and bottle method.

        Speaker: Xiaodong Shi (Shandong University)
      • 14:30
        Searches for additional Higgs bosons at CMS 15m

        Recent searches for BSM Higgses (both neutral and charged) performed by the CMS experiment at a center of mass of 13 TeV will be presented.

        Speaker: Mariarosaria D'Alfonso (Massachusetts Inst. of Technology (US))
      • 14:45
        Searches for additional Higgs bosons at ATLAS 15m

        The discovery of the Higgs boson with the mass of about 125 GeV completed the particle content predicted by the Standard Model. Even though this model is well established and consistent with many measurements, it is not capable to solely explain some observations. Many extensions addressing such shortcomings introduce additional Higgs-like bosons which can be either neutral, singly-charged or even doubly-charged, or additional resonances with masses larger or smaller than that of the SM Higgs boson. The current status of searches for these particles based on the full LHC Run 2 dataset of the ATLAS experiment at 13 TeV are presented.

        Speaker: Maria Florencia Daneri (Buenos Aires)
      • 15:00
        ATLAS Searches for Resonances Decaying to Boson Pairs 15m

        Many extensions to the Standard Model predicts new particles decaying into two bosons (W, Z, photon, or Higgs bosons) making these important signatures in the search for new physics. Searches for such diboson resonances have been performed in final states with different numbers of leptons, photons, as well as jets and b-jets where new jet substructure techniques are used to disentangle the hadronic decay products in highly boosted configuration. This talk summarises recent ATLAS searches with Run 2 data collected at the LHC and explains the experimental methods used, including vector- and Higgs-boson-tagging techniques.

        Speaker: Nora Emilia Pettersson (CERN)
      • 15:15
        Searches for heavy resonances decaying into Z, W, and Higgs bosons at CMS 15m

        We present a summary of searches for new heavy resonances decaying into pairs or triplets of bosons, performed on proton-proton collision data collected with the CMS detector at the CERN LHC at a center-of-mass energy of 13 TeV. A common feature of these searches is the boosted topology, where the decay products of the considered bosons (both electroweak W, Z bosons and the Higgs boson) are expected to be highly energetic and close in angle. In cases with hadronic boson decays this leads to massive, large radius jets with substructure. The exploitation of jet substructure techniques (with deep neural networks and others), allows to increase the sensitivity of such searches. Techniques to calibrate such jets discriminant and to estimate total background in data are used. Results are interpreted in the context of multiple scenarios beyond the standard model.

        Speaker: Cheng Chen (Peking)
      • 15:30
        Searches for exotic decays of the Higgs boson with the ATLAS detector 15m

        Exotic decays of the Higgs boson provide a unique window for the discovery of new physics, as the Higgs boson may couple to hidden-sector states that do not interact under the Standard Model gauge transformations. Models predicting exotic Higgs boson decays to pseudoscalars can explain the galactic centre gamma-ray excess, if the additional pseudoscalar acts as the dark matter mediator. In addition, theories beyond the Standard Model may predict lepton-flavor violating (LFV) decays of the Higgs boson. This talk presents recent ATLAS searches for decays of the 125 GeV Higgs boson to new particles, and searches for LFV decays of the Higgs boson. These searches use LHC collision data at sqrt(s) = 13 TeV collected by the ATLAS experiment in Run 2.

        Speaker: Benjamin Nachman (ATLAS (LHC Experiment ATLAS))
      • 15:45
        Searches for Higgs exotic decays and additional (pseudo)scalars at CMS 15m

        Recent CMS searches for additional scalars (pp->a, Maaa) will be presented.

        Speaker: Antoine Lesauvage (Centre National de la Recherche Scientifique (FR))
      • 16:00
        The forgotten channels: charged Higgs boson decays to a $W^\pm$ and a non-SM-like Higgs boson 15m

        The presence of charged Higgs bosons is a generic prediction of multiplet extensions of the Standard Model (SM) Higgs sector. Focusing on the Two-Higgs-Doublet-Model (2HDM), we discuss the charged Higgs boson collider phenomenology in the theoretically and experimentally viable parameter space. While almost all existing experimental searches at the LHC target the fermionic decays of charged Higgs bosons, we point out that the bosonic decay channels --- especially the decay into a non-SM-like Higgs boson and a $W$ boson --- often dominate over the fermionic channels. We propose several benchmark scenarios with distinct phenomenological features in order to facilitate the design of dedicated LHC searches for charged Higgs bosons decaying into a $W$ boson and a non-SM-like Higgs boson.

        Speaker: Jonas Wittbrodt (Lund University)
    • 14:15 16:15
      T12: Detector R&D and Data Handling: Miscellaneous
      Conveners: Annika Vauth (Universität Hamburg) , Vincent Boudry (LLR – École polytechnique)
      • 14:15
        Detector Challenges of the strong-field QED experiment LUXE at the European XFEL 15m

        The LUXE experiment aims at studying high-field QED in electron-laser and photon-laser interactions, with the 16.5 GeV electron beam of the European XFEL and a laser beam with power of up to 350 TW. The experiment will measure the spectra of electrons and photons in non-linear Compton scattering where production rates in excess of 109 are expected per 1 Hz bunch crossing. At the same time positrons from pair creation in either the two-step trident process or the Breit-Wheeler process will be measured, where the expected rates range from 10^-3 to 10^3 per bunch crossing, depending on the laser power and focus. These measurements have to be performed in the presence of low-energy high radiation-background. To meet these challenges, for high-rate electron and photon fluxes, the experiment will use Cherenkov radiation detectors, scintillator screens, sapphire sensors as well as lead-glass monitors for backscattering off the beam-dump. A four-layer silicon-pixel tracker and a compact electromagnetic tungsten calorimeter with GaAs sensors will be used to measure the positron spectra. The layout of the experiment and the expected performance under the harsh radiation conditions will be presented.

        Speaker: Oleksandr Borysov (DESY)
      • 14:30
        The ESS Neutrino Super-Beam Near Detector 15m

        The ESS Neutrino Super-Beam (ESSnuSB) is a proposed long-baseline neutrino oscillation experiment, performed with a high-intensity neutrino beam, to be developed as an extension to the European Spallation Source proton linac currently under construction in Lund, Sweden. The neutrinos would be detected with the near and far detectors of the experiment, the former within several hundred meters of the neutrino production point and the latter within several hundred kilometers. The far detector will consist of a megaton-scale water-Cherenkov detector, and the near detector will consist of a kiloton-scale water-Cherenkov detector in combination with a fine-grained tracking detector and an emulsion detector. The purpose of the near detector is to constrain the flux of the neutrino beam as well as extract the electron-neutrino interaction cross-section in water, thus requiring well performing energy reconstruction and particle flavor identification techniques. These measurements are crucial for the neutrino oscillation study that will be conducted using the far detector.

        Year 2021 sees the finalization of the conceptual design of the near detector through a study of the performance of a number of different design options, and a characterization of the neutrino reconstruction and flavor identification performances. In this talk we report on these studies.

        Speaker: Dr Alexander Burgman (Lund University)
      • 14:45
        The DUNE Near Detector 15m

        The Deep Underground Neutrino Experiment (DUNE) is an upcoming long-baseline neutrino experiment which will study neutrino oscillations. Neutrino oscillations will detected at the DUNE far detector 1300 km away from the start of the beam at Fermilab. The DUNE near detector (ND) will be located on-site at Fermilab, and will be used to provide an initial characterization of the neutrino beam, as well as to constrain systematic uncertainties on neutrino oscillation measurements. The detector suite consists of a modular 50-ton LArTPC (ND-LAr), a magnetized 1-ton gaseous argon time projection chamber (ND-Gar) surrounded by an  electromagnetic calorimeter, and the System for on-Axis Neutrino Detection (SAND), composed by magnetized electromagnetic calorimeter and inner tracker. In this talk, these detectors and their physics goals will be discussed.

        Speaker: Andrew Mastbaum (Rutgers University)
      • 15:00
        Performances of a 3D optical readout TPC for the CYGNO experiment 15m

        Gaseous Time Projection Chambers (TPC) with optical readout are an innovative and very promising detection technique to enhance the the sensitivity for light dark matter candidates.

        The Cygno experiment is pursuing this technique by developing a TPC operated with gas mixtures at atmospheric pressure equipped with a Gas Electron Multipliers (GEM) amplification stage that produces visible light. Light is collected by as high sensitivity and resolution scientific CMOS camera, while a fast photodetector is used to measure the drift time of the primary ionisation electrons and thus reconstruct the third coordinate of the ionisation track.

        In this contribution, we illustrate the technical solutions developed to construct detector prototypes and discuss their performances when exposed to radioactive sources. We present results in terms of electroluminescence yield and charge gain when operated with several gas mixtures based on He-CF4, He-CF4-isobutane, Ar-CF4, and different electric field configurations. We also illustrated the solutions adopted for the DAQ and trigger systems and the performances of an innovative multi-stage pattern recognition algorithm based on advanced clustering techniques. We show how such solutions are essential to identify and select interesting events and how we plan to have them online to cope with the data throughput. Finally, we show the evolution of the project from small size detectors to the current 50 litres prototype which will be installed and tested underground at LNGS this year. A 1 cubic meter demonstrator is expected to be built in 2021/22 and subsequently installed and commissioned at LNGS aiming at a large scale apparatus in a later stage.

        Speaker: andrea messina (University of Rome, Sapienza and INFN)
      • 15:15
        Detector characterization for Legend-200 experiment 15m

        The LEGEND collaboration is developing an experimental search for the neutrinoless double-beta ( $0\nu\beta\beta$) decay of the $^{76}$Ge isotope.
        Its first phase, LEGEND-200, uses 200 kg of $^{76}$Ge-enriched high-purity germanium (HPGe) detectors in an active liquid argon shield and is currently under construction at the Laboratori Nazionali del Gran Sasso (LNGS) in Italy.
        Inverted coaxial point-contact (ICPC) detectors are deployed in the experiment. Their peculiar geometry provides an excellent energy resolution in a broad energy range and impressive discrimination of signal against background events.
        LEGEND’s search for $0\nu\beta\beta$ requires a precise understanding of the behavior of germanium detectors, requiring extensive detector characterization.
        The acceptance tests aim to verify the performance of the delivered detectors meets specifications and to determine their optimal operational parameters.
        This talk will provide a review and the first results of the detector characterization program.

        Speaker: Valentina Biancacci (Università degli Studi di Padova & INFN Padova)
      • 15:30
        TES Detector for ALPS II 15m

        The Any Light Particle Search II (ALPS II) is a light-shining-through-a-wall (LSW) experiment at DESY, Hamburg, attempting to detect axions and axion-like-particles (ALPs), which can comprise dark matter and solve long-standing problems in physics. ALPS II can convert photons into axions/ALPs in the presence of a magnetic field, in an optical cavity. After passing through an opaque, light-tight barrier, these particles can reconvert to photons in another optical cavity, and be detected. The detection requires a sensor capable of observing the extremely low regenerated photon rates of $\mathcal{O}(10^{-5})$ Hz, necessitating a very low dark rate and high detection efficiency. This can be achieved by using a TES, a Transition Edge Sensor, a cryogenic calorimeter exploiting the drastic temperature dependence of a material's electrical resistance in its transition region around 140 mK. To achieve this, the setup is housed in a dilution refrigerator cooling it down to a temperature of $<25$ mK. Being sensitive to low-energy 1064 nm photons also makes the detector susceptible to other particles and backgrounds which can hamper the targeted low dark rate.

        We present the setup of the TES detector for ALPS II, its current status, and the analysis of its backgrounds and further improvements in the cryogenic environment to reduce the backgrounds. The viability and outlook of such a detector for the ALPS II experiment will be discussed, including future steps to measure the detection efficiency, etc.

        Speaker: Rikhav Shah (ALPS (ALPS _ Any Light Particle Search))
      • 15:45
        New Results from the Silicon Vertex Detector of the Belle II Experiment 15m

        The Silicon Vertex Detector (SVD) consists of four layers of double-sided silicon strip sensors. The SVD is one of the two vertex subdetectors within Belle II.
        Since the start of data taking in 2019 at the Super-KEKB collider (KEK, Japan), which has the highest peak-luminosity ever recorded, the SVD is operated reliably and with high efficiency, despite exposure to harsh beam background.
        Measurements using data show that the SVD has both high signal-to-noise ratio and hit efficiency, as well precise spatial resolution. Further these properties are stable over time. Recently the simulation has been tuned, using data, to improve the agrement between data and MC for cluster properties.
        The good hit-time resolution can be exploited to further improve the robustness against the higher levels of background expected as the instantaneous luminosity increases in the next years of running. First effects of radiation damage on strip noise, sensor currents and depletion voltage have been measured, although they do not have any detrimental effect on the performance of the detector.

        Speaker: Luigi Corona (BELLE (BELLE II Experiment))
      • 16:00
        The operation and performance of the TOP detector at the Belle II experiment 15m

        The SuperKEKB/Belle II experiment, the successor of the former KEKB/Belle experiment at KEK, has started its physics data taking with the full detector system since March 2019. The Time-of-Propagation (TOP) detector was designed and integrated into the Belle II detector for particle identification in the barrel region. The TOP detector consists of quartz radiators and photodetectors, Micro-Channel-Plate (MCP) PMT, and reconstructs a ring image of Cherenkov photons generated by an incident particle. It measures the timing of each detected photon with an accuracy of less than $100~\mathrm{ps}$ for good $K/\pi$ separation.

        In the operation of the TOP detector, harsh beam-induced background in the high luminosity environment is one of the critical issues to achieve high performance. We have developed various tools to visualize MCP-PMT performance and to identify and fix errors arising from front-end electronics during data taking. The TOP detector provides 85% $K$ efficiency at a 10% $\pi$ misidentification rate in the data at the early stage of the experiment. In this talk, we will report the operation status and the performance by the summer of 2021.

        Speaker: Kazuki Kojima (BELLE (BELLE II Experiment))
    • 16:15 16:30
      Break 15m
    • 16:30 18:30
      T01: Astroparticle and Gravitational Waves: Part 3
      • 16:30
        Southern Wide-field Gamma-ray Observatory: status and prospects 20m

        The Southern Wide Field Gamma-ray Observatory (SWGO) is an international R&D project aiming to design and prototype a wide field-of-view gamma-ray facility to monitor the Southern Hemisphere sky in gamma-rays.

        SWGO will be placed at a high altitude (above 4.4 km) in South America and aims to provide a good sensitivity for observations from the low energies (~100 GeV) up to the PeV region. Such energy range allows covering a broad physics program, being entirely complementary to the Cherenkov Telescope Array (CTA) and other Northern ground-based observatories, such as HAWC or LHAASO.

        In this talk, I will present the current status and plans for SWGO, namely, progress on the detector design concepts being evaluated, array layout options and site procurement. The expected sensitivity of SWGO and its science capabilities will also be addressed.

        Speaker: Ruben Conceição (LIP - Laboratório de Instrumentação e Física Experimental de Partículas)
      • 16:50
        Ultra-high-energy cosmic rays from star-forming galaxies constrain the extragalactic magnetic field 15m

        The Pierre Auger Observatory (PAO) has recently detected significant correlations between the arrival directions of ultra-high-energy cosmic rays (UHECRs) and positions in the sky of local star-forming galaxies. We interpret these results in terms of the local density of sources and the magnetic fields governing the UHECR propagation [1]. We determine the level of UHECR deflections for an ensemble of sources in a random extragalactic magnetic field description as well as a Galactic magnetic field model. In addition, we take into account energy losses with background photon fields as well as spectrum and composition measurements by the PAO. We find that the PAO anisotropy measurement is consistent with large extragalactic magnetic field strengths ($B > 0.6$ nG for a coherence length of 1 Mpc at the $5\sigma$ confidence level) in the case of a local density of star-forming galaxies. Larger source densities, on the other hand, allow for weaker extragalactic magnetic fields. However, the acceleration of UHECRs by such abundant sources is more challenging to motivate. Too large source densities and extragalactic magnetic field strengths decrease the expected level of anisotropy and are, therefore, disfavoured as well. This translates to upper limits of $B < 24 \ \rm nG$ and $\rho_0 < 9.0 \cdot 10^{-2} \ \rm Mpc^{-3}$ at the 90% confidence level.


        [1] A. van Vliet, A. Palladino, A. Taylor and W. Winter, arXiv:2104.05732.

        Speaker: Dr Arjen van Vliet (DESY Zeuthen)
      • 17:05
        Jet-induced high-energy neutrino and electromagnetic counterparts of supermassive black hole mergers 15m

        Supermassive black hole (SMBH) coalescences are ubiquitous in the history of the Universe and often exhibit strong accretion activities and powerful jets. These SMBH mergers are also promising candidates for future gravitational wave detectors such as Laser Space Inteferometric Antenna (LISA). In this work, we investigate the neutrino and electromagnetic counterpart emissions originating from the jet-induced shocks. We formulate the jet structures and relevant interactions therein, and then evaluate neutrino emission from each shock site. We find that month-to-year high-energy neutrino emission from the postmerger jet after the gravitational wave event is detectable by IceCube-Gen2 within approximately five to ten years of operation in optimistic cases where the cosmic-ray loading is sufficiently high and a mildly super-Eddington accretion is achieved. In addition, based on our model that predicts slowly fading transients with durations of ∼1−10 months with a time delay from days to months after the coalescence, we discuss implications for EM follow-up observations after the GW detection.

        Speaker: Mr Chengchao Yuan (Pennsylvania State University)
      • 17:20
        Very high energy observations of GRBs 20m

        Gamma-ray bursts (GRBs) are transient events releasing a large amount of energy in a short amount of time as electromagnetic radiation. In the past decades, both observational and theoretical efforts were made to understand their inner workings, both in the prompt and afterglow phase. The origin of the GeV emission detected by Fermi-LAT in several GRBs is one of the aspects of GRB physics which is currently not well understood. Observations at very high energies (VHE, E>100 GeV) by Cherenkov telescopes, given their better sensitivity, can provide crucial information to understand the mechanisms behind such high energy components. After almost 15 years of efforts, the MAGIC and H.E.S.S. collaborations finally detected their first bursts, GRB190114C and GRB180720B respectively, opening a new era in the study of GRBs. Such detections proved the presence of a new additional emission component up to TeV energies in the GRB afterglow phase, which can be explained by the synchrotron self-Compton process. Other two GRBs were also detected, GRB190829A by H.E.S.S. and GRB201216C by MAGIC, bringing more information but also revealing a complex picture to explain the origin of the VHE emission. In this context, observations by future facilities as the Cherenkov Telescope Array (CTA) observatory will play a crucial role to increase our understanding of the VHE emission in GRBs. In this contribution I will present the outstanding results accomplished in the last years by Cherenkov telescopes in the observation of GRBs and provide an overview of what can be achieved with future instruments.

        Speaker: Alessio Berti (Max Planck Institute for Physics)
      • 17:40
        Break & Open Discussion 20m
      • 18:00
        Unveiling the origin of steep decay in $\gamma$-ray bursts 15m

        γ-ray bursts (GRBs) are transient cataclysmic events, whose role became central in the new multi-messenger era. In the present work I propose a novel investigation of the GRB emission mechanism, via time-resolved spectral analysis of the X-ray tails of bright GRB pulses observed with the XRT instrument onboard the Neil Gehrels Swift Observatory, discovering a unique relation between the spectral index and the flux. The investigation of the spectral evolution during the GRB tail is an ideal diagnostic to understand the connection between the emission processes, the cooling processes and the outflow environment. I thoroughly discuss possible interpretations in relation to current available models and I show the incompatibility of our results with the standard high latitude emission. Our results for the first time strongly suggest evidence of adiabatic cooling of the emitting particles, shedding light on fundamental physics of relativistic outflows in GRBs. Finally I discuss the crucial role of future wide-field X-ray telescopes, such as the mission concept Theseus, for the characterisation of the GRB tail emission, highlighting also its importance in the multi-messenger context.

        Speaker: Samuele Ronchini
      • 18:15
        CALET on the International Space Station: a precise measurement of the iron spectrum 15m

        The Calorimetric Electron Telescope (CALET) was launched on the International Space Station in 2015 and since then has collected a large sample of cosmic-ray charged particles over a wide energy. Thanks to a couple of layers of segmented plastic scintillators placed on top of the detector, the instrument is able to identify the charge of individual elements from proton to iron (and above).
        The imaging tungsten scintillating fiber calorimeter provides accurate particle tracking and the lead tungstate homogeneous calorimeter can measure the energy with a wide dynamic range. One of the CALET scientific objectives is to measure the energy spectra of cosmic rays, to shed light on their acceleration and propagation in the Galaxy. After five years of observation, a precise measurement of the iron spectrum is now available in the range of kinetic energy per nucleon from 10 GeV/n to 2 TeV/n. The CALET result will be reported and compared with the findings from other experiments. A description of the analysis and details on the systematic uncertainties will be given.

        Speaker: Dr Caterina Checchia (University of Siena)
    • 16:30 18:30
      T03: Dark Matter: Part 3
      Conveners: Belina von Krosigk (Universität Hamburg) , Elisabetta Baracchini (Gran Sasso Science Institute)
      • 16:30
        CYGNUS – Directional Identification of Nuclear and Electron Recoils from Dark Matter and Solar Neutrinos 20m

        Recent advances in development of gaseous Time Projection Chambers (TPCs) with ability to reconstruct the direction of ionisation tracks at low energy, opens the possibility of building a nuclear recoil observatory capable of detecting directional signals from WIMP dark matter and coherent elastic neutrino-nucleus scattering (CEvNS) events from solar neutrinos. CYGNUS aims to achieve this through construction of an array of large-scale TPCs, distributed in multiple deep underground laboratories at different latitudes with multiple target nuclei, including He, C, F and S. Such an observatory would allow sensitivity to WIMP-nucleon scattering below the so-called neutrino floor, would open a new window on solar neutrino physics in channels so-far unexplored, and allow exploration of new Beyond the Standard Model (BSM) physics. Simultaneous reconstruction of low energy electron recoil tracks is also feasible to enhance background discrimination but also to open further channels for exploration. With CYGNUS we can envisage a definitive confirmation of the galactic origin of WIMPs and eventually mapping of the local velocity distribution even to low WIMP mass. Smaller pathfinder detectors, backed by simulations of directional sensitivity and background discrimination power, are now being developed and run to allow optimisation of the technologies and the cost-effectiveness of CYGNUS. These devices can nevertheless contribute short-term physics goals, for instance observation of the Migdal effect. Progress towards realisation of CYGNUS, its potential sensitivity in different scenarios, and results of recent R&D will be outlined, including discussion of new results on operation with SF6 negative ion gas with novel charge readout systems designed to achieve directional sensitivity to low mass WIMPs.

        Speaker: Lindsey Bignell (The Australian National University)
      • 16:50
        The Cygno Experiment 20m

        The detection of ultra-rare events as the interaction of galactic dark matter (DM) candidate particles or of neutrinos originated from the Sun requires the development of innovative detection techniques. In particular future experiments for direct DM detection requires to extend their sensitivity to masses well below 10 GeV.

        The Cygno collaboration plans to build and operate at LNGS a cubic meter demonstrator of a gaseous time projection chamber (TPC), equipped with an optical readout and using a He:CF4 gas mixture kept at atmospheric pressure. The presence of low Z atoms allows to reach a competitive sensitivity to DM masses in the GeV range while the presence of fluorine can be used to set limits on a spin-dependent DM interaction cross-section.

        The Cygno TPC is equipped with a Gas Electron Multipliers (GEM) amplification stage of the primary ionization electrons. Light is produced from the GEM while scientific CMOS cameras and fast photodetectors are combined to obtaining a three-dimensional reconstruction of the tracks either due to nuclear or to electron recoils.
        The design and the sensitivity of the demonstrator based on advanced Monte Carlo simulations of the radioactivity of the materials and of the LNGS cavern are reported. Pattern recognition algorithms are used to evaluate the identification capability of nuclear recoils against electronic recoils and studied in data from small scale prototypes. Energy measurement and also sensitivity to the source directionality are also evaluated. Therefore, a Cygno TPC would also be able to detect electron recoils originated by solar neutrinos interactions.
        The Cygno collaboration plans to demonstrate the scalability of such detector concept to reach a target mass large enough to significantly extend our knowledge about DM nature and solar neutrinos.

        Speaker: Gianluca Cavoto (Sapienza Universita e INFN, Roma I (IT))
      • 17:10
        Supernova signals of light dark matter 20m

        By virtue of their high temperatures, supernovae can produce large fluxes of MeV-scale dark matter even at couplings stronger than those constrained by cooling. In this region of parameter space, the dark matter can become diffusively trapped by scatterings within the protoneutron star, ultimately escaping with semirelativistic velocity. I will show that this can lead to the formation of a diffuse Galactic flux of supernova-produced dark matter. Furthermore, I will show that this population’s high velocity compensates for its low mass and allows it to be detected in direct detection experiments designed for GeV-scale WIMPs. I will conclude with a discussion of the potential to discriminate this dark matter from a cosmological abundance of WIMPs using directionality.

        Speaker: William DeRocco (Stanford University)
      • 17:30
        Direct detection of non-galactic light dark matter 20m

        A fraction of the dark matter in the solar neighborhood might be composed of non-galactic particles with speeds larger than the escape velocity of the Milky Way. The non-galactic dark matter flux would enhance the sensitivity of direct detection experiments, due to the larger momentum transfer to the target.

        In this note, we calculate the impact of the dark matter flux from the Local Group and the Virgo Supercluster diffuse components in nuclear and electron recoil experiments. The enhancement in the signal rate can be very significant, especially for experiments searching for dark matter induced electron recoils.

        Speaker: Gonzalo Herrera (Technical University of Munich, Max-Planck Institute for Physics)
      • 17:50
        eV-threshold Direct Dark Matter Searches 20m

        Over the last decade, significant advancements in semiconductor charge detectors have enabled single-electron resolution and threshold for the first time. These low thresholds significantly enhance detector resolution to well-motivated, but unconstrained, sub-GeV dark matter models. Following an overview of these experimental techniques in silicon and germanium detectors, I will focus on one such detector technology: Skipper CCDs. I will summarize the robust CCD program over the next decade, including recent results from DAMIC at SNOLAB, upcoming experiments including SENSEI and DAMIC-M, and ultimately the 10 kg scale OSCURA detector.

        Speaker: Daniel Baxter (University of Chicago)
      • 18:10
        Status and Plans of SuperCDMS SNOLAB 20m

        SuperCDMS SNOLAB is an underground cryogenic experiment currently under construction. The main objective of the experiment is a search for dark matter particles with masses < 10 GeV. Electron or nuclear recoils deposit energy in the germanium and silicon crystals which is collected via phonon and charge sensors. Two different detector designs are utilized: HV(High Voltage) and iZIP(interleaved Z-dependent Ionization and Phonon) detectors. HV detectors with a low threshold and excellent energy resolution will probe dark matter in the sub-GeV range; iZIP detectors, benefiting from their good separation power between electron and nuclear recoil events, are optimized to detect dark matter masses above 3 GeV. An initial HV detector is currently hosted at CUTE, a SNOLAB cryogenic test facility, with plans to take science data in the immediate future.

        Speaker: Yan Liu (UBC)
    • 16:30 18:30
      T04: Neutrino Physics: CP-violation and neutrinos
      Convener: Stefania Bordoni (Université de Genève)
      • 16:30
        T2K status and plans 20m

        Tokai-to-Kamioka (T2K) is a long baseline neutrino experiment which uses the proton beam at the Japan Particle Accelerator Research Centre (JPARC) to produce a beam of muon neutrinos and antineutrinos. T2K determines neutrino oscillation parameters of interest by comparing the measured neutrino rate and spectrum at a near detector complex, located at JPARC, and at Super-Kamiokande, a water-Cherenkov detector, located 295 km away.

        The T2K experiment performs world-leading measurements of the PMNS oscillation parameters \Delta_m^{2}{32}, sin^2(\theta{23}) and the CP violating phase \delta_{CP}, providing an exclusion at 3$\sigma$ for some values of this parameter.

        T2K is now undergoing major improvements and refurbishment. The Super-Kamiokande detector has been loaded with 0.02% of Gadolinium in 2020, enabling enhanced neutron tagging. An upgrade of the ND280 near detector, located 2.5 degrees off-axis, is scheduled for installation in 2022. The WAGASCI near detector, installed in 2018 and located 1.5 degrees off-axis, is also collecting statistics and a joint analysis at different off-axis angles is being prepared.

        The T2K collaboration is working on an updated oscillation analysis to improve the control of systematic uncertainties and enable future inclusion of improved near and far detector data. A new beam tuning has been developed, based on an improved NA61/SHINE measurement which used a replica of the T2K target and which includes a refined modeling of the materials in the beam line. New selections have been developed as well; ND280 selections now include proton and photon tagging, and the muon-neutrino samples at Super-Kamiokande now includes pion tagging. The collaboration has also developed a more robust model of systematic uncertainties for the nuclear effects in neutrino-nucleus interactions, notably for the Spectral Function approach and for pion tagging.

        This talk will review the latest measurements of oscillation parameters from T2K, the status of the new selection and systematic developments and the plans for upcoming data runs from T2K.

        Speaker: Stephen Dolan
      • 16:50
        Latest 3-flavor neutrino oscillations results from the NOvA experiment 20m

        NOvA is a long-baseline neutrino oscillation experiment. Its large tracking calorimeters can detect and identify muon and electron neutrino interactions with high efficiency. Neutrinos produced by the NuMI beam are detected by a Near Detector, located at Fermilab, and a much larger Far Detector, located 810km away in Ash River, Minnesota. NOvA can measure the electron neutrino and antineutrino appearance rates, as well as the muon neutrino and antineutrino disappearance rates, in order to constrain neutrino oscillations parameters, including the neutrino mass hierarchy and the CP-violating phase $\delta_{CP}$.
        This talk will present NOvA's latest results combining both neutrino data ($13.6\times10^{20}$POT) and antineutrino data ($12.5\times10^{20}$ POT).

        Speaker: Steven Calvez (Colorado State University)
      • 17:10
        Hyper-Kamiokande experiment 20m

        The Hyper-Kamiokande experiment consists of a 260 kt underground water Cherenkov detector with a fiducial volume more than 8 times larger than that of Super-Kamiokande. It will serve both as a far detector of a long-baseline neutrino experiment and an observatory for astrophysical
        neutrinos and rare decays.

        The long-baseline neutrino experiment will detect neutrinos originating from the upgraded 1.3 MW neutrino beam produced at the J-PARC accelerator 295 km away. A near detector suite, close to the accelerator, will help characterise the beam and minimise systematic errors.

        The experiment will investigate neutrino oscillation phenomena (including CP-violation and mass ordering) by studying accelerator, solar and atmospheric neutrinos, neutrino astronomy (solar, supernova, supernova relic neutrinos) and nucleon decays.

        In this talk, we will present an overview of the Hyper-Kamiokande experiment, its current status and physics sensitivity.

        Speaker: Takuya Tashiro
      • 17:30
        DUNE The Deep Underground Neutrino Experiment 20m

        The Deep Underground Neutrino Experiment (DUNE) is a next-generation long-baseline neutrino experiment. Its main physics goals are the precise measurement of the neutrino oscillation parameters, in particular the violation of the charge-parity symmetry and the neutrino mass hierarchy, measuring proton decay and BSM physics searches. DUNE consists of a Far Detector (FD) complex with four multi-kiloton liquid argon detectors, and a Near Detector (ND) complex located close to the neutrino source at Fermilab (USA). Here we present an overview of the DUNE experiment, its detectors, and physics capabilities.

        Speaker: Djurcic Zelimir
      • 17:50
        The ESSnuSB/HIFI Design Study 20m

        The ESS 5 Megawatt linac will be the world’s most powerful accelerator, enabling with its 1016 2 GeV protons per second the production of the world’s most intense flux, not only of neutrons, but also of neutrinos and muons. This opens unique opportunities for High Intensity Frontier fundamental physics. An EU supported Design Study of an ESS neutrino Super Beam (ESSnuSB) is under way since 2018 with the participation of physicists from 15 European institutions of the use of the neutrino beam for long baseline neutrino oscillations. Within this study is being designed the upgrade of the linac required to increase its power to 10 MW by the provision of extra H- pulses between the proton linac pulses, of a ca 400 circumference accumulator ring to compress the 3ms long linac pulses to 1.3µs, of a set of four high power neutrino targets with focusing horns and a kiloton near and a megaton far water Cherenkov neutrino detector, the latter at a distance of 540 km at the location of the second neutrino oscillation maximum. The publication of the ESSnuSB Design Study report is approaching and highlights among achieved design results will be presented. More recently a study of the use of the intense muon flux produced together with neutrinos has been started, aiming at a design of, in the first stage, a Muon Cooling Test Facility to be followed by the study of a nuSTORM low-energy facilty, a Neutrino Factory and ultimately a Muon Collider Higgs Factory. The plan for this High Intensity Frontier Initiative (HIFI) design work will be presented.

        Speaker: Loris D'Alessi
      • 18:10
        On the sources of CP violation in the Lepton sector 20m

        The phenomenon of Neutrino Oscillation has been very well confirmed by a plethora of data; we are now entering a precision era in which the mixing angles and mass differences are going to be measured with unprecedented precision by ongoing and planned experiments. However, the new measurements could reveal that the standard three flavor scenario is not enough for a complete description of oscillations and a new paradigm beyond the standard physics in the lepton sector must be invoked.
        In this talk I will discuss how to test that all CP violating asymmetries are described in terms of the single leptonic Jarlskog invariant as predicted in the absence of new physics effects.

        Speaker: Davide Meloni (Mathematics and Physics Department, Roma Tre University)
    • 16:30 18:30
      T05: Heavy Ion Physics: Part 3

      Note: All contributions are given 12 minutes + 3 min for questions

      • 16:30
        Measurements of mixed harmonic cumulants in Pb-Pb collisions at 5.02 TeV with ALICE 15m

        Multi-particle cumulants of azimuthal angle correlations are compelling tools to constrain the initial conditions and probe the properties of the quark-gluon plasma created in the ultrarelativistic heavy-ion collisions at the LHC. However, only very few of them have been measured experimentally and supplemented with corresponding theoretical calculations.

        Using a newly developed correlation technique, we will present the first measurements of mixed harmonic cumulants in Pb--Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$~TeV recorded with the ALICE detector. The centrality dependence of correlations between two flow coefficients as well as the correlations between three flow coefficients, both in terms of their second moments, are shown. In addition, a collection of mixed harmonic cumulants involving higher moments of flow amplitudes $v_2$ and $v_3$ is measured for the first time, where the characteristic signature of negative, positive and negative signs for the four-, six- and eight-particle cumulants, respectively, is observed. The measurements are compared to the hydrodynamic calculations using iEBE-VISHNU with AMPT and TRENTo initial conditions. It is shown that these new studies on correlations between three flow coefficients as well as correlations between higher moments of two different flow coefficients can tighten constraints on initial-state models and help extract precise information on the dynamic evolution of the hot and dense matter created in heavy-ion collisions at the LHC.

        Speaker: You Zhou (Niels Bohr Institute)
      • 16:45
        Search for collective behaviour and multiparton interactions in ep scattering at HERA 15m

        Collective behaviour of final-state hadrons is studied in ep scattering using the H1 and ZEUS detectors at HERA. Measurements of two- and four-particle azimuthal correlations in both DIS and photoproduction are presented. Ridge yields are extracted from fits to two-particle correlations with H1 data. Comparisons of the magnitudes and signs of the first- and second-harmonic of two-particle correlations are made with ZEUS data. Four-particle cumulant correlations are observed to be positive.
        The results do not indicate the kind of collective behaviour observed at RHIC and the LHC in high-multiplicity hadronic collisions. The possibility of multiparton interactions are studied in photoproduction with ZEUS. Comparisons of PYTHIA predictions with the measurements strongly indicate the presence of multiparton interactions from hadronic fluctuations of the exchanged photon.

        Speaker: Dhevan Gangadharan (Universitat Heidelberg)
      • 17:00
        Measurements of collective behavior in pp, Xe+Xe, and Pb+Pb collisions with the ATLAS detector 15m

        This talk presents ATLAS measurements of collective, flow phenomena in a variety of collision systems, including pp collisions at 13 TeV, Xe+Xe collisions at 5.44 TeV, and Pb+Pb collisions at 5.02 TeV. A new measurement of vn-[pT] correlations in Xe+Xe and Pb+Pb collisions is presented for harmonics n=2, 3, and 4. The correlation between the event-wise average transverse momentum ([pT]) and the harmonic flow (vn) carries important information about the initial-state geometry of the Quark-Gluon Plasma. Additionally, the potential quadrupole deformation in Xe+Xe is predicted to produce an initial state with enhanced shape and size fluctuations, and result in non-trivial change in the correlation. A measurement of the sensitivity of two-particle correlations in pp collisions to the presence of jets is presented. By rejecting particles associated with low-pT jets, this data can distinguish the role that semi-hard processes play in the collective phenomena observed in pp collisions.

        Speaker: Somadutta Bhatta
      • 17:15
        Studies of anisotropic flow with event-shape engineering and mean transverse momentum - flow correlations in Pb-Pb, Xe-Xe and pp collisions with ALICE 15m

        Measurements of anisotropic flow ($v_n$) provide valuable information on the properties of the quark-gluon plasma.
        Along with studies of standard flow observables, one can use strong fluctuations of the anisotropic flow for an efficient selection of the events corresponding to a specific initial geometry. Another quantity with unique sensitivity to physical processes in the initial state is the Pearson correlation coefficient of anisotropic flow and the mean transverse momentum, $\rho(v_{2}^{2},[p_{\rm T}])$. In particular, recent developments in heavy-ion theory suggest that initial momentum correlations and initial geometry give rise to dramatically different evolution of $\rho(v_{2}^{2},[p_{\rm T}])$ with charged-particle multiplicity, mainly at the lowest multiplicity region not accessible in most of the LHC experiments.

        In this talk, the selection technique known as Event Shape Engineering has been used to measure the elliptic and triangular flow of inclusive and identified particles ($\pi$, K, p, ${\rm K}^{\rm 0}_{\rm S}$, $\Lambda$, $\Xi$) in Pb--Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV recorded by the ALICE detector. The effect of the event-shape selection is within uncertainties independent of particle species up to $p_{\rm T} \sim 8$ GeV/$c$, and the origin of this observation is discussed. Next, we present the measurements of $\rho(v_{2}^{2},[p_{\rm T}])$ in Pb--Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV and Xe--Xe collisions at $\sqrt{s_{\rm NN}} = 5.44$ TeV as a function of centrality, and as a function of charged-particle multiplicity at midrapidity that extends to the lowest multiplicities available. In addition, the results are complemented by the same measurements in pp collisions at $\sqrt{s} = 13$ TeV, where effects related to the initial geometry are suppressed. The measurements are compared to initial state models with and without initial momentum anisotropy and discussed in context of hydrodynamical and pQCD-inspired models. Finally, a new multi-harmonic correlation coefficient $\rho(v_{2}^{2},v_{3}^{2},[p_{\rm T}])$ is presented and discussed as an alternative to resolve between different initial state models in semicentral heavy-ion collisions.

        Speaker: Emil Gorm Nielsen (ALICE)
      • 17:30
        Impact of the initial electromagnetic and glasma fields on heavy quarks and leptons from Z0 decay 15m

        Heavy quarks are excellent probes to study the initial stages of heavy ion collisions since they are generated in the early times around 0.1 fm/c together with a thermalization time that is comparable to the lifetime of the QGP phase. Ultra-relativistic heavy ion collisions are expected to generate a huge electromagnetic (e.m.) field that is expected to generate a splitting of the directed flow of charged particles and anti-particles. In this talk we will discuss how the strong initial e.m. field can lead to a large directed flow v1 of neutral particles/anti-particles D0 and anti-D0 of few percent much larger compared to the observed light charged particles v1 and how it can be considered as a possible probe of the formation of the quark-gluon plasma phase.
        Moreover, we have found a general formula for all possible charge dependent flow observables that can be generated by the strong electromagnetic fields in non-central relativistic heavy ion collisions. The formula has a very simple form at pT larger than several GeV/c, which can be treated as the signature of charged dependent flow observables induced by e.m. fields. Furthermore, we found that the v1 splitting depends critically on the time evolution of the magnetic field. Based on this study, we finally discuss why the measurement of of leptons from Z0 decay and its correlation to the charmed mesons are better in probing e.m. fields and thus opening a new way to constrain the EM field.
        The second topic we want to discuss is the evolution of HQ distribution in the initial glasma fields w.r.t. the standard HQs interaction with the QGP. From the interaction between glasma field and HQs, we find that the field can lead to an initial enhancement of RAA of charm quarks contrary to the pattern of the standard particle interaction; this furthermore leads to the modification on the relation between the elliptic flow v2 and RAA of charmed mesons after the interaction with the QGP. 
        [1] Y. Sun, G. Coci, S. K. Das, S. Plumari, M. Ruggieri and V. Greco, Phys. Lett. B 798, 134933 (2019).
        [2] Y. Sun, S. Plumari and V. Greco, Phys. Lett. B 816, 136271 (2021).
        [3] Y. Sun, V. Greco and S. Plumari, arXiv: 2104.03742.
        [4] L. Oliva, S. Plumari and V. Greco, arXiv: 2009.11066.
        [5] S. K. Das, S. Plumari, S. Chatterjee, J. Alam, F. Scardina and V. Greco, Phys. Lett. B 768, 260-264 (2017).

        Speaker: Dr Yifeng Sun (Department of Physics and Astronomy, University of Catania)
      • 17:45
        Polarization of lambda hyperons, vorticity and helicity structure in heavy-ion collisions 15m

        Simulations of peripheral Au+Au collisions at NICA energies was performed in the PHSD transport model. The properties of velocity and vorticity fields, hydrodynamic helicity was studied at different impact parameters and energies. The general structure of velocity field follows the "little bang" pattern which may be quantified by the velocity dependence allowing to extract the "Hubble" constant. Quadrupole structures of the vorticity field in transverse reaction plane was obtained. The effect of helicity separation was detected. Calculation of Λ - hyperons polarization is performed in thermodynamic and anomalous models at NICA energies. The polarization of Λ-hyperons at NICA energies was calculated in thermodynamic approximation and anomalous mechanism, based on Chiral Vortical Effect.

        Speaker: Aleksei Zinchenko (P.G. Demidov Yaroslavl State University)
      • 18:00
        Spectator induced electromagnetic effects on charged meson production in nucleus-nucleus collisions from NA61/SHINE at CERN SPS 15m

        The SPS Heavy Ion and Neutrino Experiment (NA61/SHINE) studies the properties of hadron production in collisions of beam hadrons and nuclei with fixed hadronic and nuclear targets.
        In this talk, I will discuss the space-time evolution of the system of strongly interacting matter created in the collision, studied from the modification of charged pion spectra and $\pi^{+}/\pi^{-}$ ratios by the electromagnetic (EM) field induced by the spectator system as a function of collision centrality. First results on Ar+Sc collisions at 40 A GeV/$c$ ($\sqrt{s_{NN}}$ = 8.76 GeV) will be shown, including the first-ever measurement of spectator induced EM effects in a small peripheral nucleus-nucleus system in the SPS energy range.
        These will be compared to Ar+Sc intermediate collisions at 150 A GeV/$c$($\sqrt{s_{NN}}$ = 16.8 GeV) from NA61/SHINEs and Pb+Pb peripheral collision data at 158 A GeV/$c$ ($\sqrt{s_{NN}}$ = 17.3 GeV) obtained by the NA49 experiment at the CERN SPS. The present implications of the new data from NA61/SHINE for the space-time evolution of the system will be discussed.

        Speaker: Sneha Bhosale (IFJ PAN)
      • 18:15
        Secondary nuclei from O-16 fragmentation at the LHC 15m

        Studies of collisions of light systems, like O–O, are planned at the LHC [1]. In particular, the translation of initial collision geometry with alpha-clustering in O-16 to triangular modulation of elliptic flow is discussed [2,3]. To date there were no measurements, even at lower collision energies, which demonstrated such fine effects of radial flow. However, numerous measurements of fragmentation of relativistic O-16 were already performed, see, in particular [4]. Therefore, the clustering of O-16 can be revealed by comparing these data to calculations with and without clustering. In the present work we model the fragmentation of O-16 in collisions with light and heavy nuclei by means of a new version of Abrasion-Ablation Monte Carlo for Colliders (AAMCC) model [5] with accounting for pre-equilibrium clustering of spectator matter. AAMCC model is based on Glauber Monte Carlo model [6] in calculating the numbers of participant and spectator nucleons in colliding nuclei. Because of a half-moon shape of spectator matter, it instantaneously dissociates into several independent hot systems defined by minimum spanning tree (MST) clustering algorithm. It is assumed that the excitation energy of each system correlates with its volume and its decays are simulated by means of Fermi break-up model from the Geant4 toolkit [7]. A small contribution to production of forward fragments from electromagnetic dissociation of O-16 is also calculated with RELDIS model [8]. It is demonstrated that in contrast to Pb–Pb collisions, neutron and proton Zero Degree Calorimeters in the ALICE experiment at the LHC will be less effective in triggering hadronic and electromagnetic interactions of O-16 because of a large number of neutrons and protons remaining in undetected nuclear fragments. As found, the measured production of Li, Be, B and N fragments [4] is described by AAMCC, but the production of carbon is underestimated. At the same time, channels with a single He-4 are overestimated with respect to data [4], but the rates of simultaneous production of two and three He-4 are underestimated. This all indicates that alpha-clustering effects in initial O-16, which give preference to He-4 as fragmentation products of relatively cold spectator matter, have to be taken into account in AAMCC in addition to the considered pre-equilibrium MST clustering.
        The work has been carried out with financial support of RFBR within the
        project 18-02-40035-mega.

        [1] Z. Citron et al., CERN Yellow Rep. Monogr. 7 (2019) 1159
        [2] W. Broniowsky et al., Nucl. Phys. A 1005 (2021) 121763
        [3] S.H. Lim et al., Phys. Rev. C 99 (2019) 044904
        [4] M. El-Nagdy et al., J. Phys. Comm. 2 (2018) 035010
        [5] A. Svetlichnyi, I. Pshenichnov, Bull. RAS:Physics 84 (2020) 911
        [6] C. Loizides et al., Phys. Rev. C 97 (2018) 054910
        [7] J.M. Quesada et al., Prog. Nucl. Sci. Tech. 2 (2011) 936
        [8] I.A.Pshenichnov, Phys. Part. Nucl. 42 (2011) 215

        Speaker: Aleksandr Svetlichnyi (INR RAS, MIPT(NRU))
    • 16:30 18:30
      T06: QCD and Hadronic Physics: Part 3: PDFs

      Note: All contributions are given 12 minutes + 3 min for questions

      Convener: laura Fabbietti (TUM)
      • 16:30
        PDF analysis of Z boson polarisation data from LHC and constraints to Higgs boson production cross section by xFitter 15m

        Recent developments of the xFitter PDF analysis package and studies based on it are summarised. The emphasis is given to the PDF analysis of the Z boson polarisation data which provide additional constraint to the gluon distribution for Bjorken x below 0.1. Studies using pseudo data samples corresponding to an integrated luminosity of the LHC Run 3 and high-luminosity HL-LHC show that the PDF uncertainty of the Higgs boson production cross section can be reduced significantly.

        Speaker: Juri Fiaschi (Westfälische Wilhelms-Universität Münster)
      • 16:45
        Photon PDF and Impact from heavy flavors in the CT18 global analysis 15m

        Building upon the most recent CT18 global fit, we present:
        1) A new calculation of the photon content of proton based on an application of the LUXqed formalism.
        2) The impact of heavy-flavor production data on the CT18 PDFs family.

        CT18 Photon PDF: We explore two principal variations of the LUXqed ansatz. In one approach which we designate CT18lux, the photon PDF is calculated directly using the LUXqed formula for all scales, $Q$. In an alternative realization, CT18qed, we instead initialize the photon PDF in terms of the LUXqed formulation at a lower scale, $Q\approx Q_0$, and evolve to higher scales with a combined QED kernel at ${\cal O}(\alpha)$, ${\cal O}(\alpha \alpha_s)$ and ${\cal O}(\alpha^2)$. Phenomenological implications of these photon PDFs at the LHC are discussed.

        Heavy flavors in CT18: We discuss the impact of heavy-flavor production data on the CT18 PDFs family. In particular, we discuss the impact on the CT18 global analysis of the latest charm and bottom production measurements from the H1 and ZEUS collaborations and the differential top-quark pair production cross section measurements from CMS and ATLAS. We discuss tensions and interplays between heavy-quark observables in the global fit and the different pulls on the CT18 gluon.

        Speaker: Keping Xie (Pitt Pacc)
      • 17:00
        NNPDF4.0: The Structure of the Proton at 1% Precision 15m

        We present a new release of the NNPDF family of global analyses of the proton's parton distribution functions: NNPDF4.0. It includes a wealth of new experimental data from HERA and the LHC, from dijet cross-sections and isolated photons to single-top and top-quark pair differential distributions. The NNPDF4.0 methodology benefits from improved machine learning algorithms, in particular automated hyperparameter optimisation and stochastic gradient descent for neural network training, which has been validated extensively by means of closure tests and future tests. We demonstrate the stability of the results with respect to the choice of parameterisation basis. We compare NNPDF4.0 with its predecessor NNPDF3.1 as well as to other recent global fits, and study its phenomenological implications for representative collider observables. We assess the impact of representative datasets on specific PDF flavour combinations, such as the dijet and top quark data on the gluon, the Drell-Yan and neutrino DIS data on strangeness, and electroweak measurements on charm and quark flavour separation.

        Speaker: Roy Stegeman (University of Milan)
      • 17:15
        Determination of proton parton distribution functions using ATLAS data 15m

        We present fits to determine parton distribution functions (PDFs) using inclusive W/Z-boson measurements from the ATLAS experiment at the LHC. The ATLAS measurements are used in combination with deep-inelastic scattering data from HERA. We also present the results of PDF fits that use W/Z+jets measurements from ATLAS in addition to the measurements listed above. An improved determination of the sea-quark densities at high Bjorken, x, is seen, while confirming a strange-quark density similar in size to the up- and down-sea-quark densities in the range x < 0.02 found by previous ATLAS analyses. If available, PDF fits including inclusive W and Z boson production, ttbar production, W+jets and Z+jets production, inclusive jet production and direct photon production will also be presented.

        Speaker: Claire Gwenlan (Oxford)
      • 17:30
        Precision QCD in $ep$ collisions at the LHeC 15m

        The LHeC and the FCC-he are the cleanest, high resolution microscopes that the world can build in the nearer future. Through a combination of neutral and charged currents and heavy quark tagging, they will unfold the parton structure of the proton with full flavour decomposition and unprecedented precision. In this talk we will present the most recent studies on the
        determination of proton parton densities as contained in 2020 LHeC Conceptual Design Report update [1]. We will also present the results on the determination of the strong coupling constant through the measurement of total and jet cross sections.

        [1] LHeC Collaboration and FCC-he Study Group, P. Agostini et al., e-Print: 2007.14491 [hep-ex], to appear in J. Phys. G.

        Speaker: Claire Gwenlan (Oxford)
      • 17:45
        Transverse momentum dependent splitting functions in the Parton Branching method 15m

        The Parton Branching (PB) approach provides a way to obtain transverse momentum dependent (TMD) parton densities. Its equations are written in terms of splitting functions and Sudakov form factors and can be solved with Monte Carlo methods. Even though the transverse momentum is known in every branching, the PB method currently uses the DGLAP splitting functions, which assume that the parton has no transverse momentum. We propose to extend the PB method by including TMD splitting functions, a concept from high-energy factorization.

        We present the evolution equations and the connection to DGLAP evolution equations and BFKL evolution equation. We show their solutions obtained with a Monte Carlo Simulation and show numerically the effects that TMD splitting functions have on the TMD distribution functions.

        Speaker: Lissa Keersmaekers (University of Antwerp)
      • 18:00
        Jet-based TMD measurements with H1 data 15m

        Recently, jet measurements in DIS events close to Born kinematics have been proposed as a new probe to study transverse-momentum-dependent (TMD) PDFs, TMD fragmentation functions, and TMD evolution. We report measurements of lepton-jet momentum imbalance and hadron-in-jet correlations in high-$Q^2$ DIS events collected with the H1 detector at HERA. The jets are reconstructed with the kT algorithm in the laboratory frame. These are two examples of a new type of TMD studies in DIS, which will serve as pathfinder for the Electron-Ion Collider program.

        Speaker: Benjamin Nachman (ATLAS (LHC Experiment ATLAS))
      • 18:15
        Proton 3D imaging via transverse-momentum-dependent gluon densities 15m

        In this talk we present exploratory studies of the 3D gluon content of the proton, as a result of analyses on leading-twist transverse-momentum-dependent (TMD) gluon distribution functions, calculated in a spectator model for the parent proton. Our formalism embodies a fit-based parameterization for the spectator-mass density, suited to describe both the small and the moderate-x regime. Particular attention is paid to the $T$-odd gluon TMDs, which represent a key ingredient in the description of relevant spin-asymmetries emerging when the nucleon is polarized, as the gluon Sivers effect. All these analyses are helpful to shed light on the gluon dynamics inside nucleons and nuclei, which is one of the primary goals of new-generation colliders, as the Electron-Ion Collider, the High-Luminosity LHC and NICA-SPD.

        Speaker: Francesco Giovanni Celiberto (ECT*/FBK Trento & INFN-TIFPA)
    • 16:30 18:30
      T07: Top and Electroweak Physics: Part 3

      20 Minutes talks are meant as 15'+5'
      15 Minutes talks are meant as 12'+3'

      Conveners: Eleni Vryonidou, Elisabetta Gallo-Voss (CMS (CMS-Experiment))
      • 16:30
        LUXE: A new experiment to study non-perturbative QED in electron-LASER and photon-LASER collisions 15m

        The LUXE experiment (LASER Und XFEL Experiment) is a new experiment in planning at DESY Hamburg using the electron beam of the European XFEL. LUXE is intended to study collisions between a high-intensity optical LASER and 16.5 GeV electrons from the XFEL electron beam, as well as collisions between the optical LASER and high-energy secondary photons. The physics objective of LUXE are processes of Quantum Electrodynamics (QED) at the strong-field frontier, where the electromagnetic field of the LASER is above the Schwinger limit. In this regime, QED is non-perturbative. This manifests itself in the creation of physical electron-positron pairs from the QED vacuum, similar to Hawking radiation from black holes. LUXE intends to measure the positron production rate in an unprecedented LASER intensity regime. An overview of the LUXE experimental setup is given, in the context within the field of high-intensity particle physics. The foreseen detector systems and their sensitivity are presented. Finally, the prospects for studying BSM physics are also discussed.

        Speaker: Louis Helary (FTX (FTX Fachgruppe SLB))
      • 16:45
        Study of $e^+e^-$ annihilation into hadrons at low energies with ISR at BABAR 15m

        The measurement of exclusive $e^+e^-$ to hadrons processes is a significant part of the physics program of BABAR experiment, aimed to improve the calculation of the hadronic contribution to the muon $g−2$ and to study the intermediate dynamics of the processes. We present the most recent studies performed on the full data set of about 470 fb$^{−1}$ collected at the PEP-II e+e− collider at a center-of-mass energy of about 10.6 GeV. In particular, we report the results on $e^+e^-$ annihilation into three pions and into states with six and seven pions or kaons, in an energy range from production threshold up to about 4 GeV.

        Speaker: Vladimir Druzhinin (BINP, Novosibirsk)
      • 17:00
        Vector boson scattering in CMS 15m

        Vector boson scattering is a key production process to probe the electroweak symmetry breaking of the standard model, since it involves both self-couplings of vector bosons and coupling with the Higgs boson. If the Higgs mechanism is not the sole source of electroweak symmetry breaking, the scattering amplitude deviates from the standard model prediction at high scattering energy. Moreover, deviations may be detectable even if a new physics scale is higher than the reach of direct searches. Latest measurements of production cross sections of vector boson pairs in association with two jets in proton-proton collisions at sqrt(s) = 13 TeV at the LHC are reported using a data set recorded by the CMS detector. Differential fiducial cross sections as functions of several quantities are also measured.

        Speaker: Meng Lu
      • 17:15
        Recent observation and measurements of vector-boson fusion and scattering with ATLAS 15m

        Measurements that exploit the weak vector-boson scattering and weak vector-boson fusion are fundamental tests of the gauge structure of the Standard Model and are sensitive to anomalous weak boson self interactions. In this talk, we present recent results in this contest performed by the ATLAS experiment using proton-proton collisions at sqrt(s)=13 TeV. Measurements of Zjj final states produced via weak-boson fusion are shown, differential cross-section measurements are presented as well as reinterpretation in terms of an effective field theory to constrain new physics beyond the Standard Model. If available, new results on weak-boson production will also be shown.

        Speaker: Dag Gillberg
      • 17:30
        Searches for quartic anomalous coupling at the LHC with intact protons 15m

        We will discuss the sensitivity to quartic anomalous couplings between photons and W/Z bosons at the LHC using intact protons in the final state. This allows obtaining a negligible background for 300 fb−1 of data and improves the sensitivities to anomalous couplings by two or three orders of magnitude compared to standard methods. We will also discuss the sensitivity to axion-like particles that also improves by two orders of magnitude.

        Speaker: Christophe Royon (The University of Kansas (US))
      • 17:45
        SMEFT analysis of vector boson scattering and diboson data from the LHC Run II 15m

        We present a systematic interpretation of vector boson scattering (VBS) and diboson measurements from the LHC in the framework of the dimension-six Standard Model Effective Field Theory (SMEFT), based on our results available at https://arxiv.org/abs/2101.03180.
        We try to understand what is the interplay between VBS and diboson measurements in order to constrain 16 independent directions in the dimension-six EFT parameter space, finding that VBS provides complementary information on several operators relevant for the description of the electroweak sector.
        Finally we also quantify the ultimate EFT reach of VBS measurements via dedicated projections for the High Luminosity LHC. Our results motivate the integration of VBS processes with Higgs measurements in future global SMEFT interpretations of particle physics data.

        Speaker: Giacomo Magni (VU, Nikhef)
      • 18:00
        Measurements of multi-boson production at ATLAS 15m

        Measurements of multiple electroweak bosons production at the LHC constitute an important test of the Standard Model. They are sensitive to the properties of electroweak-boson self-interactions and provide a test of the electroweak theory and of the perturbative quantum chromodynamics. In this talk, we present recent results from the ATLAS experiment for multi-boson production in proton-proton collisions at sqrt(s) =13 TeV. The differential cross-section measurement of WW production in association with jets is presented. We also present the measurement of differential cross-sections of four-lepton events, containing two same-flavour, opposite-charge electron or muon pairs.. The data are corrected for detector inefficiency and resolution and are compared to theoretical predictions. The measurements are reinterpreted in terms of an effective field theory to constrain new physics beyond the Standard Model. If available new results on other final states will be also presented

        Speaker: Jessica Metcalfe (Argonne National Laboratory)
      • 18:15
        Multiboson production in CMS 15m

        This talk reviews recent measurements of multiboson production using CMS data. Inclusive and differential cross sections are measured using several kinematic observables.

        Speaker: Mohammad Wadud (University of Minnesota (US))
    • 16:30 18:30
      T08: Flavour Physics and CP Violation: Part 3
      Conveners: Alexander Glazov (BELLE (BELLE II Experiment)) , Jorge Martin Camalich (Instituto de Astrofisica de Canarias)
      • 16:30
        New physics searches through $\tau$ decays at Belle 15m

        We report the result of a search for $\tau \to \ell \gamma$ ($\ell = e, \mu$) using the full data sample at Belle. Since the observation of neutrino oscillations has unambiguously shown that the lepton flavor is no longer conserved, we can expect lepton flavor violation (LFV) in the charged lepton sector. Though the standard model (SM) does not predict charged LFV decays at an observable rate, $\tau \to \ell \gamma$ is predicted by many new physics scenarios and is thus one of the most promising LFV modes. Consequently, we have obtained the most stringent limit on the branching fraction of $\tau \to \mu \gamma$. In addition, we report the result of a search for tau electric dipole moment (EDM) evaluating $\tau$-$\tau$-$\gamma$ vertex coupling using the full data sample at Belle. At present, the observed CP violation is insufficient to explain the prevalent matter-antimatter asymmetry in our universe. On the other hand, the EDM of leptons is predicted to be negligibly small in the SM and is expected as a source of CPV in the lepton sector induced by some new physics. We have obtained one order more sensitive result both for the real and imaginary parts of the $\tau$ EDM.

        Speaker: Sourav Patra (BELLE (BELLE II Experiment))
      • 16:45
        Searches for lepton flavour/number violation in K+ and pi0 decays at the NA62 experiment 15m

        The NA62 experiment at CERN collected a large sample of charged kaon decays into final states with multiple charged particles in 2016-2018. This sample provides sensitivities to rare decays with branching ratios as low as 10^{-11}. Results from searches for lepton flavour/number violating decays of the charged kaon and the neutral pion to final states containing a lepton pair based on this data set are presented.

        Speaker: Elisa Minucci (CERN)
      • 17:00
        Explaining the Cabibbo Angle Anomaly 15m

        The first row of the Cabibbo-Cobayashi-Maskawa (CKM) matrix shows a discrepancy of $\sim 3\sigma$ with unitarity, known as the ”Cabibbo Angle Anomaly” (CAA). After reviewing the origin and status of the anomaly, I investigate the various possibilities to explain it in the context of physics beyond Standard Model (BSM) which can be broadly grouped into three categories: modifications of four-fermion contact operators, modifications of the leptonic W vertices and modifications of the W vertices with quarks. In addition, I also discuss the phenomenological implications in the electroweak (EW) precision observables and low energy observables testing lepton flavour universality (LFU) which have to be taken into account in order to asses the viability of these solutions. Then, I review concrete realizations of BSM physics proposed to solve the CAA, which highlight the correlation with other existing anomalies such as $b\to s\ell\ell$ and $\tau\to \mu\nu\nu$, providing interesting predictions to be tested experimentally in the near future.

        Speaker: Claudio Andrea Manzari (University of Zurich)
      • 17:15
        Tau physics prospects at Belle II 15m

        The Belle II experiment is a substantial upgrade of the Belle detector and will operate
        at the SuperKEKB energy-asymmetric e+e− collider. The design luminosity of the machine
        is 8 × 1035 cm−2s−1 and the Belle II experiment aims to record 50 ab−1 of data, a factor
        of 50 more than its predecessor. From February to July 2018, the machine has completed a
        commissioning run and main operation of SuperKEKB has started in March2019. Belle II has
        a broad τ physics program, in particular in searches for lepton flavour and lepton number
        violations (LFV and LNV), benefiting from the large cross section of the pair wise τ
        lepton production in e+e− collisions. We expect that after 5 years of data taking, Belle II
        will be able to reduce the upper limits on LF and LN violating τ decays by an order of
        magnitude. Any experimental observation of LFV or LNV in τ decays constitutes an unambiguous
        sign of physics beyond the Standard Model, offering the opportunity to probe the underlying
        New Physics. In this talk we will review the τ lepton physics program of Belle II.

        Speaker: Alejandro De Yta Hernandez (BELLE (BELLE II Experiment))
      • 17:30
        Latest dark sector searches at the Belle Experiment 15m

        The Belle experiment has accumulated close to $1\,{\rm ab}^{-1}$ of data in electron-positron collisions at center-of-mass energies around various $\Upsilon(nS)$ resonances. These data can be used to perform a number of new physics searches in the context of dark sector with an unprecedented precision. We present for the first time the results of a search of the dark photon in $B$-meson decays, the search for dark matter in bottomonium decays, as well as the latest results in the search for dark forces, via direct production, or in the decay of mesons. These competitive results can be used to severely constrain new physics scenarios.

        Speaker: Seokhee Park (BELLE (BELLE II Experiment))
      • 17:45
        Flavor physics at FCC-ee with focus on Bc->tau nu 15m

        Z-pole operation at FCC-ee offers a unique laboratory for flavor physics, with the anticipated production of 10^12 b-quarks and the opportunity for triggerless data-taking in a clean e+e- collision environment. Using new simulation and analysis tools developed for FCC-ee physics and performance studies, theoretically compelling beauty, charm, and tau decay modes are studied in order to evaluate key performance metrics and expected yields. Comparisons with LHCb Upgrade and Belle-II are performed, in order to highlight areas within flavor physics where FCC-ee measurements can be highly impactful.

        Speaker: Clement Helsens (CERN)
      • 18:00
        Measurement of the neutron electric dipole moment in the nEDM and n2EDM experiments 15m

        The electric dipole moment (EDM) of the neutron is a strong probe of CP violation beyond the Standard Model.
        In particular, its value could reveal information on baryogenesis.
        We report the latest result from the nEDM collaboration, which operates an experiment to measure the neutron EDM at the Paul Scherrer Institute
        using Ramsey’s method of separated oscillating magnetic fields with ultracold neutrons.
        The estimation of systematic effects profited from an unprecedented knowledge of the magnetic field relying on the use of both a 199Hg comagnetometer and an array of optically pumped cesium vapor magnetometers
        The total uncertainty is dominated by the statistics and the observe EDM is compatible with zero. A new improved limit, |d|<1.8e-26 e.cm @ 90% CL, was computed.
        The systematic precision was improved by a factor 5 with respect to previous experiments opening the way to improved sensitivity in the next generation experiment, n2EDM
        which is being build at PSI for an operation starting 2022.

        Speaker: Benoit Clément (LPSC - Université Grenoble Alpes)
      • 18:15
        Study of hadronic $B$ and $B_s$ decays at Belle 15m

        We report the first search for the penguin-dominated process $B_{s} \to \eta^{\prime} X_{s\bar{s}}$ using a semi-inclusive method. In absence of a statistically significant signal, we set a 90\% confidence-level upper limit $1.4 \times 10^{-3}$ on the partial branching fraction where $M(X_{s\bar{s}}) \leq 2.4\,{\rm GeV}$. We also report final results for the $B^{0}_{s} \to D_{s} X$ and $B^{0}_{s} \to \eta \eta^{\prime}$ decays. These results are obtained using $121.4\,{\rm fb}^{-1}$ data collected at the $\Upsilon(5S)$ resonance by the Belle experiment at the KEKB asymmetric-energy $e^{+}e^{-}$ collider. Furthermore, we report on measurements involving three-body decays $B^{+} \to K^{+} K^{-} \pi^{+}$ and $B^{+} \to \pi^{+} \pi^{0} \pi^{0}$ based on the Belle data collected at the $\Upsilon(4S)$ resonance.

        Speaker: Shawn Dubey
    • 16:30 18:30
      T09: Higgs Physics: Yukawa - part 2
      Conveners: meng xiao (zhejiang university) , Sarah Heim (DESY) , Giovanni Marchiori (APC Paris - CNRS/IN2P3 and Université de Paris) , Michael Trott (NBI)
      • 16:30
        Hbb dead or alive? 17m

        Hbb associated production is often advocated as an ideal proxy to measure the bottom-quark Yukawa coupling yb. However, large irreducible background exists, which make the extraction of yb very challenging, if not impossible. I will discuss some recent calculations which showed how gluon-fusion, VH and VBF production conspire to kill our sensitivity on yb from Hbb at the LHC.

        Speaker: Marco Zaro (University and INFN Milano)
      • 16:47
        Measurements of Higgs boson production in decays to two tau leptons with the ATLAS detector 17m

        Testing the couplings of the Higgs boson to leptons is important to understand the origin of lepton masses. This talk presents measurements of Higgs boson production in Higgs boson decays to two tau leptons based on pp collision data collected at 13 TeV.

        Speaker: Michaela Mlynarikova (Northern Illinois University)
      • 17:04
        Measurements of Higgs boson cross sections and differential distributions in leptonic final states (CMS) 17m

        The latest results obtained with CMS data collected at a centre-of-mass energy of 13 TeV targeting Higgs boson decays in leptonic final states at CMS will be discussed.

        Speaker: Andrew Loeliger (University Of Wisconsin Madison)
      • 17:21
        Search for rare decays of the Higgs boson with the ATLAS detector 17m

        The Standard Model predicts several rare Higgs boson decay channels, among which are decays to a Z boson and a photon, H→Zγ, and to a low-mass lepton pair and a photon H→ℓℓγ. The observation of these decays could open the possibility of studying the CP and coupling properties of the Higgs boson in a complementary way to other analyses. Results based on 139 fb−1 of pp collision data collected at 13 TeV will be presented.

        Speaker: Artem Basalaev (ATLAS (ATLAS Dark Matter with Higgs))
      • 17:38
        Measurements of Higgs boson properties and couplings at CMS 17m

        Recent measurements of Higgs boson properties and couplings will be presented.

        Speaker: Dr Ulascan Sarica (UCSB)
      • 17:55
        Searches for rare Higgs boson decays (CMS) 17m

        Recent measurements of rare SM Higgs boson decays will be presented.

        Speaker: Silvio Donato (INFN Pisa)
      • 18:12
        Searches for Higgs invisible (CMS) 17m

        Recent CMS searches for Higgs Invisible decays will be presented.

        Speaker: Vukasin Milosevic (IHEP Beijing)
    • 16:30 18:30
      T10: Searches for New Physics: Part 3

      All talks in this session will be 12 mins + 3 mins for the discussion.

      Convener: Pedro Schwaller (Johannes Gutenberg University Mainz)
      • 16:30
        Possible indications for new Higgs bosons in the reach of the LHC: N2HDM and NMSSM interpretations 15m

        In several searches for additional Higgs bosons at the LHC, in particular the CMS search in the $pp \to \phi \to t \bar t$ channel and the ATLAS search in the $pp \to \phi \to \tau^+\tau^-$ channel, a local excess at the level of $3\,\sigma$ or above has been observed at a mass scale of $m_\phi \approx 400$~GeV. We investigate to what extent a possible signal in those channels could be accommodated in the Next-to-Two-Higgs-Doublet Model (N2HDM) or the Next-to Minimal Supersymmetric Standard Model (NMSSM). In a second step we furthermore analyse whether such a model could be compatible with both a signal at $\approx 400$~GeV and at $\approx 96$~GeV, where the latter possibility is motivated by observed excesses in searches for the $b \bar b$ final state at LEP and the di-photon final state at CMS. The analysis for the N2HDM reveals that the observed excesses at $\approx 400$~GeV in the observed excesses at $\approx 400$~GeV in the $pp \to \phi \to t \bar t$ and $pp \to \phi \to \tau^+\tau^-$ channels point towards different regions of the parameter space, while one such excess and an additional Higgs boson at $\approx 96$~GeV could simultaneously be accommodated. In the context of the NMSSM an experimental confirmation of a signal in the $t \bar t$ final state would favor the alignment-without-decoupling limit of the model, where the Higgs boson at $\approx 125$~GeV could be essentially indistinguishable from the Higgs boson of the SM. In contrast, a signal in the $\tau^+\tau^-$ channel would be correlated with significant deviations of the properties of the Higgs boson at $\approx 125$~GeV from the ones of a SM Higgs boson that could be detected with high-precision coupling measurements.

        Speaker: Thomas Biekoetter (T (Phenomenology))
      • 16:45
        A 96 GeV Higgs Boson in the 2HDMS 15m

        We discuss a ∼ 3 σ signal (local) in the light Higgs-boson search in the diphoton decay
        mode at ∼ 96 GeV as reported by CMS, together with a ∼ 2 σ excess (local) in the bb̄
        final state at LEP in the same mass range. We interpret this possible signal as a Higgs
        boson in the 2 Higgs Doublet Model with an additional complex Higgs singlet (2HDMS).
        We find that the lightest CP-even Higgs boson of the 2HDMS type II can perfectly
        fit both excesses simultaneously, while the second lightest state is in full agreement
        with the Higgs-boson measurements at 125 GeV, and the full Higgs-boson sector is
        in agreement with all Higgs exclusion bounds from LEP, the Tevatron and the LHC
        as well as other theoretical and experimental constraints. We derive bounds on the
        2HDMS Higgs sector from a fit to both excesses and describe how this signal can be
        further analyzed at the LHC and at future e⁺e⁻ colliders, such as the ILC. We analyze
        in detail the anticipated precision of the coupling measurements of the 96 GeV Higgs
        boson at the ILC.

        Speaker: Steven Paasch (FLC (FTX Fachgruppe SLB))
      • 17:00
        Searches and techniques for boosted resonances (non-diboson) with the ATLAS detector 15m

        Many new-physics signatures at the LHC produce highly boosted particles, leading to close-by objects in the detector and necessitating jet substructure techniques to disentangle the hadronic decay products. This talk presents the latest ATLAS results for searches for heavy W’ and Z’ resonances in top-bottom, di-top and 4-top final states using 13 TeV data. It will explain the techniques used, including new top-tagging techniques using machine learning and the use of large-radius jets containing electrons.

        Speaker: Chris Malena Delitzsch (University of Arizona)
      • 17:15
        Heavy $Z^\prime$ Bosons in the Secluded $U(1)^\prime$ Model at Hadron Colliders 15m

        We study $Z^{\prime}$ phenomenology at hadron colliders in an $U(1)^{\prime}$ extended MSSM. We choose a $U(1)^{\prime}$ model with a secluded sector, where the tension between the electroweak scale and developing a large enough mass for $Z^{\prime}$ is resolved by incorporating three additional singlet fields into the model. We perform a detailed analysis of the production, followed by decays, including into supersymmetric particles, of a $Z^{\prime}$ boson with particular emphasis on its possible discovery. We select three different scenarios consistent with the latest available experimental data and relic density constraints, and concentrate on final signals involving $2\ell+\not\!\!E_{T}$,$4\ell+\not\!\!E_{T}$ and $6\ell+\not\!\!E_{T}$. Including the SM background from processes with two, three or four vector bosons, we show the likelihood of observing a $Z^\prime$ boson is not promising for the HL-LHC at 14 TeV, but optimistic for 27 and 100 TeV.

        Speaker: Levent Selbuz (Ankara University)
      • 17:30
        Search for heavy BSM particles coupling to third generation quarks at CMS 15m

        We present results from searches for resonances with enhanced couplings to third generation quarks, based on proton-proton collision data at a centre-of-mass energy of 13 TeV recorded by CMS. The signatures include single and pair production of vector-like quarks and heavy resonances decaying to third generation quarks. A wide range of final states, from multi-leptonic to entirely hadronic is covered. Jet substructure techniques are employed to identify highly-boosted heavy SM particles in their hadronic decay modes.

        Speaker: Anna Benecke (UCLouvain)
      • 17:45
        Searches for vector-like quarks with the ATLAS Detector 15m

        Vector like quarks appear in many theories beyond the Standard Model as a way to cancel the mass divergence for the Higgs boson. The talk will focus on the most recent results using 13 TeV pp collision data collected by the ATLAS detector. This presentation will address the analysis techniques, in particular the selection criteria, the background modeling and the related experimental uncertainties. The results and the complementarity of the various searches, along with the phenomenological implications, will be discussed.

        Speaker: Mesut Unal (Austin)
      • 18:00
        Searches for leptoquarks with the ATLAS detector 15m

        Leptoquarks (LQ) are predicted by many new physics theories to describe the similarities between the lepton and quark sectors of the Standard Model and offer an attractive potential explanation for the lepton flavour anomalies observed at LHCb and flavour factories. The ATLAS experiment has a broad program of direct searches for leptoquarks, coupling to the first-, second- or third-generation particles. This talk will present the most recent 13 TeV results on t he searches for leptoquarks and contact interactions with the ATLAS detector, covering flavour-diagonal and cross-generational final states.

        Speaker: Yoav Afik (CERN)
      • 18:15
        Precise LHC limits on the U_1 leptoquark parameter space 15m

        The $U_1$ leptoquark is the popular candidate to explain the persistent 𝐵-anomalies. In this talk, I will discuss the bounds which can be imposed on a $U_1$ leptoquark model using the latest LHC data. The current LHC data is quite sensitive towards the mass of $U_1$ and its couplings with the Standard Model second and third-generation fermions. I will discuss some simple scenarios with different couplings that can contribute to the relevant operators and show that the LHC data either rule out or severely constrain these simple $U_1$ scenarios. I will discuss how a TeV range $U_1$ can survive the LHC limits (from both dilepton and direct search data) and explain the anomalies. I will also point out some search channels for $U_1$.

        Speaker: Arvind Bhaskar (International Institute of information technology)
    • 16:30 18:30
      T12: Detector R&D and Data Handling: Instrumentation 1
      Conveners: Vincent Boudry (LLR – École polytechnique) , Dr Alessandro Cardini (INFN Sezione di Cagliari, Italy)
      • 16:30
        Cryogenic SiPMs for dark matter search with DarkSide-20k 15m

        The Global Argon Dark Matter Collaboration is pursuing the construction, at the Gran Sasso Laboratory (LNGS), of DarkSide-20k a dark matter direct search experiment designed as a 20-tonne fiducial mass Time Projection Chamber (TPC) with SiPM based photosensors, expected to be free of any instrumental background for an exposure of >100 ton x years.
        Large-area cryogenic SiPM tile modules (PDM) have been developed with lower
        radiogenic background and higher photo-detection efficiency (>40%) respect to the PMTs usually adopted in dark matter experiments. Two units made of $25 \times 25$ cm$^2$ arrays of PDMs have been operated and characterized at liquid nitrogen and argon temperatures in small prototype detectors. Several options are currently pursued for transmission of the analog signals to the digitisation electronics at room temperature.
        More than 8280 PDMs are needed to fully instrument the DarkSide-20k Liquid Argon TPC. The
        assembly will take place in NOA, a 700 m$^2$ clean room under construction at
        LNGS that will host a dedicated microelectronics packaging facility. The
        present status of DarkSide-20k with the latest achievements and the future
        steps and strategies will be presented.

        Speaker: Iza Kochanek
      • 16:45
        New radiation-hard scintillators for FCC detectors 15m

        Future circular and linear colliders as well as the Large Hadron Collider in the High-Luminosity era have been imposing unprecedented challenges on the radiation hardness of particle detectors that will be used for specific purposes e.g. forward calorimeters, beam and luminosity monitors.
        We performed research on the radiation-hard active media for such detectors, particularly calorimeters, by exploring intrinsically radiation-hard materials and their mixtures.The initial samples that we probed were thin plates of Polyethylene Naphthalate (PEN) and Polyethylene Terephthalate (PET) and thin sheets of HEM. The previous studies indicate towards promising performance under high radiation conditions. We will report on the necessary process of mixing the PEN and PEN for optimized scintillation and signal timing properties preserving the high radiation resistance.
        Recently we developed a new plastic scintillator material. The scintillation yield of SX sample was compared to a BGO crystal using a setup with 90Sr source and a Hamamatsu R7525-HA photomutiplier tube (PMT). The SX was measured to yield roughly 50% better light production compared to the BGO crystal.sample SX was irradiated at the CERN PS radiation facility with 24 GeV/c protons. The samples received a fluence of 1.2 x 1015 p/cm2 which corresponds to 4 x 105 Gy radiation doses. The comparison of the transmission spectra of SX sample before and after the irradiation exhibits a loss of roughly 7% light transmission after 4 x 105 Gy proton irradiation

        Speaker: Prof. Yasar Onel (University of Iowa (US))
      • 17:00
        Fast neutron detection with GAGG/SiPM matrix detector 15m

        The spectacular progress in the improvement of scintillation properties of Ce doped Gd-based crystalline compounds was demonstrated in the last decade. That makes possible use of these materials for neutron detection, similarly to Li-based inorganic scintillators. Particularly, the materials of interest are compositionally disordered Gd3Al2Ga3O12 (GAGG) garnets, which are tolerant to a different kind of ionizing radiation, exhibit a high light yield of up to ~50000 photons/MeV, have scintillation decay time shorter than 80 ns, time resolution of annihilation -quanta ~160ps. Their emission band peaks at ~520 nm matching the sensitivity spectrum of the silicon photomultipliers (SiPMs). Recently we demonstrated the response of GAGG based detector to neutrons of Am(Pu)-Be sources [1,2]. Natural gadolinium is a mixture of six stable isotopes, two of which, 155Gd and 157Gd, have a high cross-section of the thermal neutron capture, 61000 and 254000 barns, respectively. Moreover, Gd nuclei possess a set of resonances providing resonance integral ~400 bn. The capture of the neutrons is accompanied by the emission of γ-quanta of different energy, which can be detected in the same scintillation material. The role of the neutron capture by Gd is diminished when their energy reaches a few MeV, and an interaction with 69Ga,71Ga via new channels ((n,p) and (n,α) becomes dominating. Here we report on results of the measurement of neutrons obtained at the bombardment of the Pb 5 cm thick target with a 200 MeV proton beam. The capabilities of the Time-Off-Flight measurement at the short base 0.5m and Pulse Shape Discrimination of the different secondaries were demonstrated. Our results prove the GAGG-based detectors are promising to construct short-flight-base neutron spectrometers utilizing the PSD signals analysis.
        1. M Korjik, KT Brinkmann, G Dosovitskiy, V Dormenev, A Fedorov, D Kozlov, Compact and Effective Detector of the Fast Neutrons on a Base of Ce-doped Gd3Al2Ga3O12 Scintillation Crystal., IEEE Transactions on Nuclear Science 66 (1)(2019), 536-540, 7
        2. 2. A Fedorov, V Gurinovich, V Guzov, G Dosovitskiy, M Korzhik, V Kozhemyakin, A Lopatik, D Kozlov, V Mechinsky, V Retivov, Sensitivity of GAGG based scintillation neutron detector with SiPM readout, Nuclear Engineering and Technology 52(2020) 2306-2312

        Speaker: Prof. Mikhail Korzhik (NRC Kurchatov Institute)
      • 17:15
        Performance of high-granularity resistive Micromegas at high particle rates and future developments 15m

        We present the latest performance studies of high-granularity resistive Micromegas detectors for tracking applications in high-rate environment.
        With the aim of developing resistive Micromegas able to efficiently and reliably work in HEP experiments where particle fluxes as high as 10 MHz/cm$^2$ are expected, we have built and characterised several prototypes with high-granularity readout plane, with 3 mm$^2$ size pads, and different resistive protection schemas exploiting a pad-patterned layer or two uniform DLC layers.
        We will present the latest results on the detector performance at high rate obtained with tests in laboratory and with particle beams, with a detailed comparison of the resistive schemas and assessment of their potential.
        The next step of the project is to make the routing of the readout channels simpler, allowing the construction of larger detectors while keeping the construction process affordable. We are addressing this challenge by the integration of the readout electronics on the back side of the Micromegas board, which leads to a highly integrated device. Preliminary results obtained with the first prototype with embedded APV chip will be presented.

        Speaker: Paolo Iengo (INFN)
      • 17:30
        ReD: characterisation of a SiPM based Liquid Argon TPC for directional dark matter detection studies 15m

        A double-phase argon Time Projection Chamber (TPC), with an active volume of $5\times 5 \times 5$ cm$^3$, has been designed and constructed for the Recoil Directionality (ReD) experiment, within the DarkSide collaboration. The aim of the ReD project is to investigate the directional sensitivity of argon-based TPCs via columnar recombination to nuclear recoils in the energy range of interest (20-200\,keV$_{nr}$) for direct dark matter searches. The key novel feature of the ReD TPC is a readout system based on cryogenic Silicon Photomultipliers (SiPMs), which are employed and operated continuously for the first time in an argon TPC. Over the course of six months, the ReD TPC had been characterised under various operating conditions using $\gamma$-ray and neutron sources, demonstrating stability of the optical sensors and reproducibility of the results.
        The scintillation gain and ionisation amplification of the TPC were measured to be $g_1 = (0.194 \pm 0.013)$ photoelectrons/photon and $g_2 = (20.0 \pm 0.9)$ photoelectrons/electron, respectively. The ratio of the ionisation to scintillation signals (S2/S1), instrumental for the positive identification of a candidate directional signal induced by WIMPs, has been investigated for both nuclear and electron recoils. At a drift field of 183 V/cm, an S2/S1 dispersion of 12% was measured for nuclear recoils of approximately 60-90 keV$_{nr}$, as compared to 18% for electron recoils depositing 60\,keV of energy. The detector performance discussed in this talk will allow the investigation of a directional effect due to columnar recombination. In addition a phenomenological parameterisation of the recombination probability in liquid argon is presented and employed for modeling the dependence of scintillation quenching and charge yield on the drift field for electron recoils between 50-500 keV and fields up to 1000 V/cm.

        Speaker: Yury Suvorov (UNINA / INFN Sez. Napoli)
      • 17:45
        An Alternative Design for Large Scale Liquid Scintillator Detectors 15m

        Single page abstract attached as a pdf.

        Speaker: Iwan Morton-Blake (University of Oxford)
      • 18:00
        The Water Cherenkov Test Experiment at CERN 15m

        Water Cherenkov detectors play a crucial role in the study of neutrinos, providing an affordable way to instrument enormous target masses. As neutrino experiments transition from discovery to precision measurement understanding the performance of these detectors becomes more and more important – in the latest T2K oscillation result the Super-Kamiokande detector uncertainty is the largest systematic error on the oscillated event samples. For the next generation experiments Hyper-Kamiokande, ESSnuSB and THEIA, a comprehensive understanding of the detector will be essential.

        The Water Cherenkov Test Experiment (WCTE) is a proposed experiment at CERN that will study the response of water Cherenkov detectors to hadron, electron, and muon beams. The aim of the experiment is to test new photosensor technologies such as multi-PMT modules and apply calibration techniques with known particle fluxes to demonstrate a $1\%$ level calibration for GeV scale neutrino interactions. WCTE will also measure Cherenkov light production, pion scattering and secondary neutron production to provide direct inputs to the currently operating T2K and Super-K experiments. This talk describes the WCTE physics program, the detector design and its proposed implementation at the CERN T9 test beam area.

        Speaker: Mark Scott (Imperial College London)
      • 18:15
        Plastic scintillator production involving Additive Manufacturing 15m

        Plastic scintillator detectors are widely used in high-energy physics. Often they are used as active neutrino target, both in long and short baseline neutrino oscillation experiments. They can provide 3D tracking with 4$\pi$ coverage and calorimetry of the neutrino interaction final state combined with a very good particle identification, sub-nanosecond time resolution. Moreover, the large hydrogen content makes plastic scintillator detectors ideal for detecting neutrons.
        However, new experimental challenges and the need for enhanced performance require the construction of detector geometries that are complicated using the current production techniques. The solution can be given by additive manufacturing, able to quickly make plastic-based objects of any shape.
        The applicability of 3D-printing techniques to the manufacture of polystyrene-based scintillator will be discussed. We will report on the feasibility of 3D printing polystyrene-based scintillator with light output performances comparable with the one of standard production techniques. The latest advances on the R\&D aim at combining the 3D printing of plastic scintillator with other materials such as optical reflector or absorber. The status of the R\&D and the latest results will be presented.

        Speaker: Davide Sgalaberna (ETH Zurich)
    • 09:30 11:30
      T01: Astroparticle and Gravitational Waves: Part 4
      • 09:30
        Galactic cosmic-ray propagation 20m