13th Annual Meeting of the Helmholtz Alliance "Physics at the Terascale"

25 Nov 2019, 09:00 → 27 Nov 2019, 16:30 Europe/Berlin

DESY Hamburg

Welcome to the 13th Annual Helmholtz Alliance Workshop on "Physics at the Terascale"! As in the past 12 years, the workshop will offer a rich programme of stimulating plenary talks and parallel sessions full of intense discussion on topics connected to the LHC, linear colliders, and Belle. The following parallel sessions will be held:
- Higgs physics
- Searches
- Top physics
- B physics
- Standard Model physics
- Computing and Machine Learning

 

Monday 25 November

Linear Collider Forum

Conveners: Dr Frank Simon (Max-Planck-Institute for Physics), Gudrid Moortgat-Pick (University of Hamburg / DESY), Prof. Ivor Fleck (University of Siegen), Sabine Riemann (DESY)

1 Status at ILC in Japan

Speaker: Ties Behnke (DESY)

Slides News_from_Japan.pptx

2 Future prospects

Speaker: Georg Weiglein (DESY)

Slides LCforum_futperspectives_19.pdf

3 Top quark mass via ttbar gamma

Speaker: Prof. Juan Fuster (IFIC-Valencia)

Slides DESY-LCF-red.pdf

15:30 Coffee break

4 Why do we need an energy-upgradable e+e- collider?

Speaker: Dr Jenny List (DESY Hamburg)

Slides jlist_500_191125.pdf

5 Higgs width measurement using H->Z*Z decay at ILC

Speakers: Prof. Alexey Drutskoy (LPI), Alexey Drutskoy

Slides Talk_2019_11_DESY.pdf

6 Machine Status: Summary of the Accelerator Sessions at the LCWS2019

Speaker: Dr Benno List (DESY IPP)

Slides LCForum_20191126.pptx

Tuesday 26 November

Plenary

7 Welcome

Speaker: Ties Behnke (DESY)

Slides Terascale_Introduction_2019.pptx

8 Plasma acceleration and its role at DESY and for HEP

Speaker: Wim Leemans (DESY)

9 LHC physics

Speaker: Till Eifert

Slides eifert_Terascale_workshop_Nov2019.pdf

11:00 Coffee break

Flavor physics

Conveners: Dr Christoph Langenbruch (RWTH Aachen), Mr Danny van Dyk (Universität Zürich)

10 Flavour Anomalies

Speaker: Ivan Nisandzic

Slides Terascale_nisandzic.pdf

11 Lepton Flavour Universality test $R(K\pi\pi)$

Speaker: Johannes Heuel (RWTH Aachen)

Slides jheuel_rkpipi.pdf

12 New Physics in rare semileptonic charm decays

Speaker: Mr Rigo Bause (TU Dortmund)

Slides Slides "New Physics in rare semileptonic charm decays - Rigo Bause"

13 $D_s$ spectroscopy

Speaker: Lukas Calefice

Slides LukasCalefice_Terascale_261119.pdf

Higgs physics

Conveners: Matthias Schröder (KIT), Sarah Heim (DESY), Vincent Theeuwes (University of Goettingen)

14 Higgs boson pair production: NLO and beyond (15+5)

Speaker: Prof. Matthias Steinhauser (KIT)

Slides steinhauser_terascale19.pdf

15 Constraints on the Higgs self-coupling from searches for Higgs boson pairs in the bbtautau final state with the ATLAS detector and prospects at the High-Luminosity LHC (15+5)

Speaker: Mr Petar Bokan (Uppsala University (SE), Georg-August-Universitaet Goettingen (DE))

Slides Terascale_HHbbtautau_191126_PBokan.pdf

16 Higgs self coupling constraints from the HH + H combination (15+5)

Speaker: Kunlin Ran (DESY)

Slides kunlinRan_h_hh_20191126.pdf

Physics beyond the SM

Conveners: Alexander Mann (Ludwig-Maximilians-Universität München), Frank Ellinghaus, Samuel Bein (University of Hamburg), Dr Saranya Samik Ghosh (RWTH Aachen University), Prof. Thorsten Ohl (Universität Würzburg)

17 Light stops, heavy gluinos, and a novel solution to the little hierarchy problem

Radiative corrections with new heavy particles coupling to Higgs doublets destabilize the electroweak scale and require an ad-hoc counterterm cancelling the large loop contribution. If the mass scale m1 of these new particles in in the TeV range, this feature constitutes the "little fine-tuning problem". We consider the case that the new-physics spectrum has a little hierarchy with two particle mass scales m1, m2 and m2 = O(10 m1) and no tree-level couplings of the heavier particles to Higgs doublets. As a concrete example we study the (next-to-)minimal supersymmetric standard model ((N)MSSM) for the case that the gluino mass M3 is significantly larger than the stop mass parameters m_{L,R} and show that the usual one-loop fine-tuning analysis breaks down. If m_{L,R} is defined in the dimensional-reduction (DR-bar) or any other fundamental scheme, corrections enhanced by powers of M3^2/m_{L,R}^2 occur in all higher loop orders. After resumming these terms we find the fine-tuning measure substantially improved compared to the usual analyses with M3 <~ m_{L,R}. In our hierarchical scenario the stop self-energies grow like M3^2, so that the stop masses m_{L,R}^{OS} in the on-shell (OS) scheme are naturally much larger than their DR-bar counterparts m_{L,R}^{DR-bar}. This feature permits a novel solution to the little fine-tuning problem: DR-bar stop masses are close to the electroweak scale, but radiative corrections involving the heavy gluino push the OS masses, which are probed in collider searches, above their experimental lower limits. As a byproduct, we clarify which renormalization scheme must be used for squark masses in loop corrections to low-energy quantities such as the B-B-bar mixing amplitude.

Speaker: Prof. Ulrich Nierste (Karlsruhe Institute of Technology)

Slides nierste_desy_tera19.pdf

18 Searches for sleptons, charginos and neutralinos with compressed mass spectra using the ATLAS detector at sqrt(s) = 13 TeV

Speaker: Mr Jorge Andres Sabater Iglesias (ATLAS)

Slides TeraScale261119.pdf

19 Search for Higgsino production in SUSY scenarios with a compressed mass spectrum

A search for leptonic decays of Higgsino-like neutralinos in the case of a compressed mass spectrum using a track, a reconstructed lepton and missing transverse momentum is presented. We consider the case of a second-lightest neutralino decaying into a dark matter candidate - lightest neutralino - and two leptons via an off-shell Z boson. In the case of a very small mass differences between the neutralinos, the leptons produced are very soft, making it very difficult to reconstruct them at CMS. We consider a case where one of the leptons is reconstructed by a track, and the other as a reconstructed lepton of opposite charge. Signals of different mass splitting are probed and interpreted within a set of simplified models. Multivariate discriminants are employed in the event- and object-level selection, and their performance is studied.

Speaker: Mr Yuval Nissan (Experimental Particle Group)

Slides Higgsino_terascale.pdf

20 Anomalous magnetic moments from asymptotic safety

The measurements of the muon and electron anomalous magnetic moments hint at physics beyond the standard model. We explain why asymptotically safe extensions based on an enlarged scalar sector and Yukawa couplings between leptons and new vector-like fermions explain the data naturally. Models stabilize the Higgs potential, predict the tau anomalous magnetic moment, and feature new particles in the TeV energy range whose signatures at colliders are indicated. With small CP phases, the electron EDM can be as large as the present bound.

Speaker: Mrs Clara Hormigos-Feliu (TU Dortmund)

Slides hormigos-feliu_terascale.pdf

Standard Model

Conveners: Joany Manjarres Ramos (Technische Universität Dresden), Patrick Connor (DESY), Sven-Olaf Moch (UHH)

21 Dipole subtraction at next-to-leading order in nonrelativistic-QCD factorization

Abstract: "We describe an implementation of a subtraction scheme in the nonrelativistic-QCD treatment of heavy-quarkonium production at next-to-leading-order in the strong-coupling constant, covering S- and P-wave bound states. It is based on the dipole subtraction in the massless version by Catani and Seymour and its extension to massive quarks by Phaf and Weinzierl. Important additions include the treatment of heavy-quark bound states, in particular due to the more complicated infrared-divergence structure in the case of P-wave states." Reference: arXiv:1909.03698

Speaker: Dr Mathias Butenschön (Universität Hamburg)

Slides Vortrag_Terascale2019.pdf

22 Recent NNLO PDF fits with HERA jet data

Abstract: The HERA collaborations H1 and ZEUS have performed new PDF fits including their latest jet data. A joint PDF fit of H1 and ZEUS jet and inclusive data is performed in the HERAPDF style at NNLO QCD. Scale uncertainties are reduced significantly with respect to the corresponding fit at NLO. The preliminary result is alpha_S(M_Z)=0.1150 +/-0.0008(exp) +0.0002-0.0005(mode/param) +/-0.0006 (hadr) +/-0.0027 (scale). The H1 collaboration performed a PDF fit of inclusive diffractive data together with diffractive jet data at NNLO QCD. This results in a more precise determination of diffractive parton densities and improved predictions of diffractive jet production cross sections.

Speaker: Dr Katarzyna Wichmann (DESY)

Slides kwichmann-hera.pdf

23 A new strategy to further reduce the uncertainty of alpha_s from lattice QCD

Speaker: Prof. Francesco Knechtli (University of Wuppertal)

Slides terascale_fk.pdf

Top physics

Conveners: Dr Andrea Knue (University of Freiburg), Nils Faltermann (KIT)

24 Measurement of the ttbar production cross-section in the lepton+jets channel at sqrt(s)=13 TeV with the ATLAS experiment

Speaker: Marcel Niemeyer (University of Goettingen)

Slides terascale.pdf

25 Running of the top quark mass at 13 TeV

Speaker: Matteo Defranchis (DESY)

Slides Defranchis_2019_11_26_Terascale_meeting.pdf

26 Improving the top quark mass measurement by inserting systematic uncertainties as nuisance into a profiled likelihood fit

Speaker: Mr Christoph Garbers (University Hamburg)

Slides terascale_2019_garbersc.pdf

13:00 Lunch

Computing: Machine Learning

Conveners: Paul Glaysher (DESY), Yannik Rath (RWTH Aachen University)

27 ML activities at Belle II

Speaker: Simon Wehle (DESY)

Slides 19-11-BelleIIDL.pdf

28 Adversarial classifier for ttH(bb) in ATLAS

The ATLAS ttH(bb) analysis is limited by the background modelling uncertainties, that result in a bias of the classifier towards the Monte Carlo generator used for training. We apply adversarial domain adaptation to train a more generic classifier. We employ a neural network that simultaneously classifies the signal versus background events, while minimizing the difference of the classifier response to two alternative background MC models.

Speaker: José Manuel Clavijo Columbié (DESY)

Slides Presentation.pdf

29 ML for ttgamma in ATLAS

Through the associated production of the ttgamma process the strength of the electromagnetic gauge coupling of the top quark and the photon can be measured. The measurement of this fundamental parameter of the Standard Model (SM) also serves as a test of the vector structure of the electromagnetic interaction and a probe to new physics beyond the SM such as potential tensor contributions. Evidence of this process was found by CDF at the Tevatron at sqrt(s) = 1.96 TeV. The process was later observed in ATLAS and CMS at sqrt(s) = 7 and sqrt(s) = 8 TeV with increased precision. Different deep neural network (DNN) approaches are used to improve the separation of signal and background processes. Binary, as well as multi-class neural networks for separating ttgamma signal processes from underlying background events and other machine learning techniques for separating individual types of backgrounds are presented using proton-proton collisions data, taken between 2015 and 2018 with the ATLAS detector. Furthermore, a neural network for separating prompt photons from fake photons is presented. Signal and background processes are hereby grouped into two or multiple different classes. A dedicated overview of machine learning techniques within the scope of a ttgamma cross section measurement is given.

Speaker: Mr Steffen Korn (II Physikalisches Institut, Georg-August-Universität Göttingen)

Slides Terascale-Talk-Steffen-Korn_2.pdf

30 Attention-based reconstruction for ttH(bb) in CMS

A precise determination of the interactions of the Higgs boson with other SM particles is a crucial part of the LHC physics program. When determining the top Yukawa coupling in ttH(bb) events, deep learning plays an integral role. In the single-lepton channel, multivariate approaches using deep neural networks (DNNs) achieve state-of-the-art performance in signal/background classification. A particular challenge of this analysis is the discrimination of ttH(bb) events from the irreducible tt + bb background. Considering the combinatorial assignment of jets offers a possible means to deal with this problem and thus further improve performance. To achieve this, an attention-based DNN classifier (COBRA) was developed, whose results are presented in this talk.

Speaker: Tobias Lösche (University of Hamburg)

Slides Terascale_Tobias_Loesche.pdf

31 Generative Models for Calorimeter Shower Simulation (ILD)

In this talk, we demonstrate the usage of Generative Adversarial Networks (GANs) and Variational Auto-Encoders (VAEs) for modeling the electromagnetic showers in the context of proposed International Large Detector (ILD), in the central region of Silicon-Tungsten (Si-W) Electromagnetic Calorimeter. After successful completion of the training processes, the properties of synthesized showers are compared to the showers from a full detector simulation using Geant4. Our results demonstrate the potential of using such networks for fast calorimeter simulation for ILD detector in the future and open the possibility to complement current simulation techniques.

Speaker: Mr Engin Eren (DESY)

Slides Eren-26.11.2019.pdf

32 Hypothesis testing with neural networks (CMS)

Speaker: Jonas Rübenach (DESY)

Slides Jonas_Rübenach_Terascale.pdf

Flavor physics

Conveners: Dr Christoph Langenbruch (RWTH Aachen), Mr Danny van Dyk (Universität Zürich)

33 Tau Physics, Lepton Flavour Violation and other topics

Speakers: Dr Ami Rostomyan (DESY), Dr Francesco Tenchini (DESY)

Slides 2019-terascale.pdf

34 Search for the Lepton Flavour Violating decay $B_s^0\to\phi\mu e$

Speaker: Mr Jan-Marc Basels (RWTH Aachen University, CERN)

Slides Terascale_2019_Basels.pdf

35 $B\to D^{(*)}$ Form factors and $V_{cb}$ determination

Speaker: Marzia Bordone (University of Siegen)

Slides terascale_bordone.pdf

36 Probing New Physics with $\Lambda_b\to \Lambda_c(\to \Lambda \pi) \ell^- \bar{\nu}$

Speaker: Mr Jan-Niklas Toelstede (Technical University of Munich)

Slides terascaleJT.pdf

37 DM searches at Belle 2

Speaker: Mr Michael De Nuccio (DESY)

Slides Terascale_MichaelDeNuccio_20191126_2.pdf

Linear Collider Forum

Conveners: Dr Frank Simon (Max-Planck-Institute for Physics), Gudrid Moortgat-Pick (University of Hamburg / DESY), Sabine Riemann (DESY)

38 Heavy Flavour Jet Reconstruction with the ILD Detector Concept

Speaker: Mr Yasser Radkhorrami (DESY)

Slides Yasser_Radkhorrami_Reconstruction_of_Heavy_Flavours_at_ILC.pdf

39 Investigation of irradiation damage of the ILC positron target via high energy synchrotron radiation

Speaker: Tim Lengler

Slides Vortrag_Tim_26_11.pptx

40 Photon Mask Design for the Ideal Helical Undulator at ILC-250GeV

Speaker: Mr Khaled Alharbi (Hamburg Uni-DESY)

Slides LCForum_26.11.2019_Khaled_Alharbi.pptx

41 There and Back Again - LC and the European XFEL Experience

Speaker: Mr Marc Wenskat (UHH / DESY)

Slides LC_Wenskat.pptx

42 New ideas using plasma lenses for optimizing the OMD at the ILC

Speakers: Manuel Formela (Universität Hamburg), Niclas Hamann

Slides Plasma_Lens-MFormela.pptx

Physics beyond the SM

Conveners: Alexander Mann (Ludwig-Maximilians-Universität München), Frank Ellinghaus, Samuel Bein (University of Hamburg), Dr Saranya Samik Ghosh (RWTH Aachen University), Prof. Thorsten Ohl (Universität Würzburg)

43 Search for new physics with leptons in the final state

This presentation is a potpourri of Aachen results searching for BSM. One key search looks for excited leptons (e* and mu*) in the contact interaction channel providing the maximum sensitivity in terms of lstar mass. To put it in context, its sensitivity in terms of mass and compositeness scale Lambda is compared with the llg channel. We also search for new heavy charged boson, W', in the classical channels with enu or munu in the final state providing the max mass reach. The decay to tau+nu is gaining interest from flavour observations similar to other searches with 3rd particles. Besides searches driven by specific models, a model unspecific search is looking at all event classes to make sure we don't miss any sign of new physics.

Speaker: Dr Kerstin Hoepfner (RWTH Aachen)

Slides Terascale_BSMleptons_Hoepfner_vf.pdf

44 The tail of Wh: another way of probing New Physics with dibosons

The lack of evidence of New Physics coming from direct searches of resonances at the LHC calls for an increase in efforts to devise new observables that can indirectly probe New Physics. If new resonances exist but are out of the reach of the LHC or future colliders, they could manifest themselves through a harder p_T spectra with respect to the SM. In this context, the diboson final state has attracted lots of attention in recent times as a great New Physics probe. In this talk, I will focus on the Wh channel, with the Higgs boson decaying to either b\bar{b} or \gamma\gamma. I will discuss the relevant backgrounds in both cases and, for the hadronic Higgs channel, the details of the jet substructure techniques used to reduce them. Moreover, I will show how taking into account properly detector effects, hadronization and B-hadron decay affects the projected bounds. Finally, I will show preliminary results for the bounds on the SMEFT dimension 6 operator this channel is most sensitive to for the b\bar{b} channel at HL-LHC for the \gamma\gamma channel at FCC.

Speaker: Mr Alejo Nahuel Rossia (DESY, HU Berlin)

Slides Rossia_Wh.pdf

45 Searching for the single production of vector-like quarks in the Wb final state with the ATLAS detector at 13TeV

Speaker: Mr Ferdinand Schenck (Humboldt-Universität)

Slides Terascale2019.pdf

46 Background estimation for the search of single production of vector-like quarks

Speaker: Mr Maxx Richard Rahman (Universität Bonn)

Slides Physics_at_the_Terascale.pdf

47 Probing Higgs Sector New physics in the tail of the di-boson production

Speaker: Dr Zhuoni Qian (DESY)

Slides Helmholtz_Qian.pdf

48 Search for dark matter produced in association with fully-hadronically decaying top quark pair in events with medium missing transverse energy

Speaker: Mr Xuanhong Lou (ATLAS)

Slides TTMET_TeraScaleNew.pdf

49 LQ-SP associated with a τ lepton, decaying into charm and neutrino at ATLAS

Speaker: Patrick Bauer (Universität Bonn)

Slides TerascaleWS_Hamburg2019_PatrickBauer.pdf

Standard Model

Conveners: Joany Manjarres Ramos (Technische Universität Dresden), Patrick Connor (DESY), Sven-Olaf Moch (UHH)

50 A precise W pT measurement using ATLAS low-mu data

Abstract: Theoretical predictions of the W-boson mass via the electroweak fit are now more precise than any experimental measurement. The recent measurement by the ATLAS collaboration suffered from large uncertainties from pT(W) modelling and pileup. In 2017 and 2018 ATLAS ran under special low pileup (“low-mu”) conditions at 13TeV and 5TeV, providing respectively 339pb^-1 and 256pb^-1 of data which will be valuable for precision W physics. This talk presents the efforts and preliminary results in using this low-mu data to measure pT(W) with %-level precision, and prospects towards its use in a future W-boson mass measurement.

Speaker: Mr Harry Lyons (DESY)

Slides hlyons_terascale_26112019.pdf

51 Measurement of Zγ→ℓ+ℓ−γ differential cross-sections in pp collisions at s√=13 TeV with the ATLAS detector

Speaker: Yee Chinn Yap (Deutsches Elektronen-Synchrotron (DE))

Slides 20191126-YeeY-Terascale.pdf

52 Pileup mitigation techniques in CMS

Abstract: Every bunch crossing at the LHC has not only one proton-proton interaction but several. These additional proton-proton interactions are called pileup interactions. With the increasing luminosity of the LHC also the number of pileup interactions per bunch crossing increased in the past years and it will reach up to 140 pileup interaction during high-luminosity LHC operation. Removing the pileup from an event is essential because pileup does not only affect the jet energy but also other event observables as for example the missing transverse energy, the jet substructure, jet counting, and the lepton isolation. To account for these pileup effects various techniques like-charged hadron subtraction, pileup jet ID, delta-beta correction for lepton isolation are used within CMS, but meanwhile, a new technique, PUPPI, has been introduced and extensively tested on 2016 data. This talk will explain the algorithm behind PUPPI and shows the first Data to MC comparison plots of the variables of PUPPI.

Speaker: Anna Benecke (University of Hamburg)

Slides PU_mitigation_Benecke.pdf

53 Precision measurement of Triple Gauge Couplings at future electron-positron colliders

Abstract: With the lack of hints of new physics at high energies the focus of particle physics has started turning to precision measurements to detect small deviations from the expectations of the Standard Model. Complementary to the HL-LHC, a future electron-positron collider with energies at the electroweak symmetry breaking (EWSB) scale could enable such precise tests in the Higgs-, Electroweak- and top-sectors. Multiple proposals for such a collider are currently under discussion. Their designs vary most prominently in the center-of-mass energy, the luminosity at those energies and the availability of polarisation of either beam. The influence of these quantities on the precision of measurements informs which characteristics are desirable in a future collider. In the projection of sensitivities of electron-positron colliders, the contact interaction of three gauge bosons takes an important role. Anomalies in the triple gauge boson couplings (TGCs) could hint towards new physics in the gauge boson sector. In addition, the measured TGCs enter into signal and background estimations of Higgs coupling measurements and must be strongly constrained. Possible anomalous deviations in the TGCs can be quantified in a generic way using an effective field theory (EFT) approach. Fitting anomalous TGCs to data requires the use of final state measurements which are also used to determine beam polarisation and chiral cross-sections. Due to this overlap, a parallel fit of all these parameters is required. Such a fit has been set up and uses multi-dimensional differential cross-sections to fit TGC, chiral cross-section, and polarisation parameters. Results of this fit are presented for different setups of possible electron-positron colliders at the EWSB-scale energies, with a focus on the influence of polarisations and luminosity.

Speaker: Mr Jakob Beyer (DESY)

Slides 2019_Terascale_Jakob.pdf

54 Triple-differential dijet cross section measurement for CMS

Speaker: Daniel Savoiu (KIT, CERN)

Slides TERASCALE_2019-11-26_v1.pdf

Top + X

Conveners: Dr Andrea Knue (University of Freiburg), Matthias Schröder (KIT), Nils Faltermann (KIT), Sarah Heim (DESY), Vincent Theeuwes (University of Goettingen)

55 Measurement of top quark pair production in association with a Z boson at 13 TeV

Speaker: Joscha Knolle (DESY)

Slides JK_191126_terascale_ttz.pdf

56 Limit on tt+Z production in the Z->bb channel at the CMS experiment

Speaker: Mr Jan van der Linden (KIT)

Slides Terascale_ttZ.pdf

57 Measurement of tt+photon production in the electron+muon final state at 13 TeV with the ATLAS detector

Speaker: Mr John Meshreki (Univerisität Siegen)

Slides Terascale_November_19.pdf

58 Discovering the h to Z gamma Decay in ttbar Associated Production

Speaker: Mr Eric Madge (Johannes Gutenberg University Mainz)

Slides Eric_Madge_h_to_Z_gamma.pdf

59 Associated production of a top quark pair with a heavy boson at NLO+NNLL accuracy

Speaker: Vincent Theeuwes (University of Goettingen)

Slides VTheeuwes-Terascale.pdf

16:30 Coffee break

Seminar Talk: Quantum technologies for high energy physics

60 Quantum Computing

Speaker: Simone Montangero

Institute Assembly

Convener: Ties Behnke (DESY)

61 Institute Assembly

https://indico.desy.de/indico/event/24866/

19:00 Workshop Dinner

Wednesday 27 November

Plenary

62 High-field magnet development for LHC and beyond

Speaker: Susana Izquierdo-Bermudez (CERN)

Slides 191127_MagnetsTerascale_SIB.pptx

63 The Briefing book for the European Strategy

Speaker: Beate Heinemann (DESY and Freiburg University)

Slides 201911_Strategy_PhysatTS.pdf

10:30 Coffee break

Computing

Conveners: Christoph Wissing (DESY), Rene Caspart (KIT - Karlsruhe Institute of Technology (DE))

64 ML for Computing Operations at CMS

Speaker: Dr Hamed Bakhshiansohi (DESY)

Slides WorkflowRecovery_HelmholtzAlliance.pdf

65 Status of GoeGrid and the local monitoring system in ATLAS

Slides 2019-tarascale-gen_full.pdf

66 ATLAS Tape Carousel

Speaker: Dr Rod Walker (LMU)

Slides atlas-data-carousel-desy-2019-11.pdf

67 Heterogeneous Computing Resources for HEP

Speaker: Matthias Schnepf (KIT)

Slides terascale19_mschnepf.pdf

68 NAF

Speaker: Yves Kemp (DESY)

Slides NAF-Terascale-20191127.pdf

Higgs physics

Convener: Vincent Theeuwes (University of Goettingen)

69 Higgs decays to tau leptons in CMS (SM) (15+5)

Speaker: Teresa Lenz (DESY)

Slides Terascale_2019_Lenz.pdf

70 Order v^4 correction Higgs boson decay into J/psi + gamma (15+5)

Speaker: Dr Wai Kin Lai (Technical University of Munich)

Slides Terascale_WKLai.pdf

71 H->mumu CMS (15+5)

Speaker: Mr Tobias Kramer (Hamburg University)

Slides h2mu_Terascale2019_v4.pdf

72 Prospects of measuring Higgs boson decays into muon pairs at the ILC (15+5)

Speaker: Shin-ichi Kawada (FLC)

Slides SK_Terascale_2019.pdf

73 Two-real-scalar-singlet extension of the SM: LHC phenomenology and benchmark scenarios (15+5)

Speaker: Jonas Wittbrodt (DESY)

Slides wittbrodt.pdf

74 Search for additional Higgs bosons in bb final states with a semi-leptonic channel in CMS (15+5)

Speaker: Antonio Vagnerini (DESY)

Slides Terascale_AV_presentation.pdf

Physics beyond the SM

Conveners: Alexander Mann (Ludwig-Maximilians-Universität München), Frank Ellinghaus, Samuel Bein (University of Hamburg), Dr Saranya Samik Ghosh (RWTH Aachen University), Prof. Thorsten Ohl (Universität Würzburg)

75 Supersymmetric Higgs Inflation at Colliders

We study a scale-invariant minimal supersymmetric Standard Model which allows for an implementation of inflation in the early universe. This model has the same field content as the Next-to-Minimal Supersymmetric Standard Model (NMSSM) thus can be distinguished by observations in the scalar sectors. A crucial role play the singlet components. We point out that there might exist light singlet-like states with a different phenomenology from the ordinary (Z3-invariant) NMSSM.

Speaker: Dr Wolfgang Gregor Hollik (KIT)

Slides SUSY_Higgs_Inflation_Hollik

76 Search for SUSY in events with same-flavor opposite-charge dileptons, jets, and missing transverse momentum at CMS

The current status of a search for supersymmetry (SUSY) in events with same-flavor opposite-sign lepton pairs is presented. The analysis utilizes data recorded by the CMS detector from 2016 to 2018. As the considered signals include strong production of SUSY particles, jets are also required, along with large missing transverse momentum, which arises from undetected LSPs. An important feature of the analysis is the use of a likelihood variable which is used to discriminate between top-pair production and SUSY events.

Speaker: Mr Marius Teroerde (RWTH Aachen University)

Slides Terascale2019_MariusT.pdf

77 Chargino search at the ILC

The lighter chargino (chi1) is a prime candidate to be the next-to-lightest SUSY particle (the NLSP). Several analyses have been done of chi1 pair-production at the ILC, at specific model-points, showing that detection and property-determination is possible, even for very difficult cases. However, no recent studies have evaluated the reach of the ILC to detect chi1 pair production in general. In this contribution, cross sections for chi1 production at the ILC were evaluated with a wide range of parameters. The aim of the study was to determine the conditions for the lowest cross sections and compare these worst-case values with an estimation of the cross section limit for the observation of the lightest charginos at the ILC. The estimated limits were extrapolated from the studies performed at LEP, which can also be regarded as a worst-case scenario.

Speaker: Dr María Teresa Núñez Pardo de Vera (DESY)

Slides CharginoCrosssections.pdf

78 Improved determination of the MSSM SM-like Higgs~mass for large $\tan\beta$, complex input parameters and heavy SUSY

t.b.a.

Speaker: Ivan Sobolev (DESY Theory)

Slides Sobolev.pdf

79 Calculation of the Higgs mass in the MSSM at NNNLO and NNNLL with Xt resummation

t.b.a.

Speaker: Mr Thomas Kwasnitza (TU Dresden)

Slides kwasnitza_desy_tera19.pdf

80 Search for disappearing tracks with CMS

Speaker: Mr Viktor Kutzner (UHH)

Slides terascale2019.pdf

Standard Model

Conveners: Joany Manjarres Ramos (Technische Universität Dresden), Patrick Connor (DESY), Sven-Olaf Moch (UHH)

81 Nested soft-collinear subtractions in NNLO QCD computations

Abstract: Currently important progress is being made in next-to-next-to-leading order (NNLO) QCD calculations. As a result, many processes at hadron colliders have been computed to NNLO QCD precision. Despite these developments, the search for the optimal subtraction scheme that allows us to handle IR and collinear singularities in an efficient and general way is still ongoing. In this talk I will introduce the nested soft-collinear subtraction scheme that possesses many desired features; for example, it is analytic, fully local and highly modular. I will further describe an application of this scheme to deep inelastic scattering that, together with the description of color singlet production and decay, completes the set of building blocks that are required for the application of this scheme to arbitrary processes at hadron colliders.

Speaker: Konstantin Asteriadis (Institute for Theoretical Particle Physics, Karlsruhe Institute of Technology)

Slides asteriadis_terascale19.pdf

82 Evolution of single and double parton densities with ChiliPDF

Abstract: We present a method to discretize and numerically solve the DGLAP evolution equations, using Chebyshev interpolation. This allows for high numerically accuracy with grids of quite a moderate size. We demonstrate the power of this method, implemented in the C++ library ChiliPDF, both for conventional PDFs and for double Parton distributions, which appear in the description of double-parton interactions.

Speaker: Mr Riccardo Nagar (University of Milan Bicocca)

Slides Nagar_talk.pdf

83 Rational terms at two loops

Speaker: Mr Hantian Zhang (University of Zurich)

Slides Rterms2loop_zhang.pdf

84 Bilinear quark operators in RI/SMOM scheme at three loops

Speaker: Oleg Veretin (UHH/UR)

Transparents allianz_2019.pdf

85 Double prompt J/psi hadroproduction in the Parton Reggeization approach with high-energy resummation

Abstract: We study double prompt J/ψ hadroproduction within the nonrelativistic-QCD factorization formalism adopting the parton Reggeization approach to treat initial-state radiation in a gauge invariant and infrared-safe way. We present first predictions for the cross section distributions in the transverse momenta of the subleading J/ψ meson and the J/ψ pair. Already at leading order in α_s, these predictions as well as those for the total cross-section and its distributions in the invariant mass $m_{\psi\psi}$ and the rapidity separation |Y| of the J/ψ pair nicely agree with recent ATLAS and CMS measurements, except for the large $m_{\psi\psi}$ and large-|Y| regions, where the predictions substantially undershoot the data. In the latter regions, BFKL resummation is shown to enhance the cross sections by up to a factor of two and so to improve the description of the data.

Speaker: Dr Zhiguo He (Hamburg University)

Slides double_quarkonia.pdf

Top physics

Conveners: Dr Andrea Knue (University of Freiburg), Nils Faltermann (KIT)

86 Electroweak loops as a probe of new physics in ttbar production at the LHC

Speaker: Markus Schulze (Humboldt-Universität zu Berlin)

Slides schulze_talk.pdf

87 Measurement of the top quark polarization and ttbar spin correlations using dilepton final states at 13 TeV

Speaker: Afiq Aizuddin Anuar (DESY)

Slides spin_terascale_1127.pdf

88 Measurement of the top-quark decay width at 13 TeV with the ATLAS detector

Speaker: Mr Thomas Peiffer (Universität Göttingen)

Slides Terascale2019_TopWidth.pdf

89 Constraining top-quark couplings combining top-quark and B decay observables

Speaker: Mr Stefan Bissmann (Dortmund)

Slides Constraining_top_couplings_combining_top_and_B.pdf

90 Jet mass in boosted top quark decays

Speaker: Mr Dennis Schwarz (Uni Hamburg)

Slides BoostedJetMass.pdf

13:00 Lunch break

Plenary

91 Future silicon trackers: 4D tracking, very high fluences, very small pixels

Speaker: Nicolo Cartiglia

Slides Terascale.pdf

92 Fantastic Bs and where you could find them in 2019

Speaker: Florian Bernlochner

Slides Talk.pdf