Theory-Experimental Top Quark Mass Workshop

28 Jan 2025, 14:00 → 30 Jan 2025, 23:20 Europe/Berlin

SR1/CFEL SR4 (DESY)

Juan Fuster (IFIC-Valencia), Katerina Lipka (DESY CMS), Sven-Olaf Moch (UNI/TH (Uni Hamburg, Institut fuer Theoretische Physik))

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Meeting ID: 687 8046 9847
Passcode: 2025

 

For Thursday: directions to CFEL (building 99): see map : https://www.desy.de/content/desymaps/gelaendeplan-eng-hh.pdf?q

 

 

For Wednesday: directions from main gate to the SR1:

Tuesday 28 January

16:00 → 18:00 Seminar by A. Hoang

The direct link to the webcast is:
https://desy.zoom.us/j/99616528733
Meeting ID: 996 1652 8733
Meeting Password: 733220

Abstract: The top quark mass is currently known from so-called direct measurements with an uncertainty of 300 MeV. This represents a remarkable precision of better than 2 permille, and future measurements at the LHC will reduce this uncertainty even further. In the direct measurements the top quark mass parameter of the MC event generator used in the experimental analysis is determined. There is a general agreement that the this top quark mass parameter is close to the pole mass renormalisation scheme, but at this high level of experimental precision it is eventually mandatory to quantify that relation in a more precise and quantitative manner. In the colloquium I will provide a pedagogical overview on what we currently know about the top quark mass parameter in MC event generators.
I discuss a simple framework involving the invariant mass of boosted top quark jets in e+e- collissions in which the question can now be addressed systematically and which also shows which ingredients are needed to answer the question in general. It turns out that aspects such as the implementation of the parton shower or the modelling of hadronization effects need to be controlled at a high precision and affect the answer. It is thus also possible that there is a dependence on the Monte Carlo and the observables used for the top mass measurement. I provide an outlook on ongoing work to generalise the results to observables sensitive to the top quark decay.

Hoang-topmass.pdf

Wednesday 29 January

10:00 → 10:20 Introduction

Speaker: Katerina Lipka (DESY and University of Wuppertal)

Intro_top_mass_workshop.pdf

10:20 → 10:40 Non-relatvistic top quark pairs

Speaker: Giovanni Limatola (CMS (CMS Fachgruppe QCD))

limatola_top.pdf

10:50 → 11:20 Coffee break

11:20 → 11:40 Prospects for boosted top measurments CMS

Speaker: Roman Kogler (DESY FH, CMS)

boosted_top_jetmass.pdf

11:40 → 12:00 Prospects for boosted top measurments ATLAS

Speaker: Marcel Vos (IFIC (UVEG/CSIC) Valencia)

12:00 → 12:20 Top quark mass via jet substructure

Speaker: Aditya Pathak (DESY)

Aditya_Pathak_TopMassWorkshop_DESY.pdf

13:00 → 14:00 lunch

14:00 → 14:20 bb4l Generator

Speaker: Tomas Jezo

slides_TJezo_DESY.pdf

14:20 → 14:40 Prospects of top quark mass and width measurements using bb4l in ATLAS

Speaker: Katharina Voss (Uni Siegen)

Katharina.pdf

14:40 → 15:00 Prospects of top quark mass and width measurements using bb4l in CMS

Speaker: Jiwon Park (CMS (CMS Fachgruppe QCD))

15:00 → 15:25 Coffee break

15:25 → 15:55 NNLO tt+jet

Speaker: Colomba Brancaccio (University of Turin)

Brancaccio_TopQuarkWorkshop.pdf

15:55 → 16:15 Off-shell top

Speaker: Davide Melini (IFIC)

mt_ttj_offshell_TopMassWorshopDesyJan25-1.pdf

16:15 → 16:35 Modeling uncertainties with DCTR method

Speaker: Valentina Guglielmi (CMS (CMS Fachgruppe QCD))

Top_workshop_2025_Guglielmi.pdf

16:35 → 17:34 Discussion

19:00 → 21:10 Dinner at KNIPS

Thursday 30 January

10:00 → 10:40 ATLAS Experimental Results

Speaker: Davide Melini (IFIC)

mt_ttjATLASoverview_TopMassWorkshopDesyJan25-1.pdf

10:40 → 11:20 CMS experimental results

Speaker: Ana Ventura Barroso (CMS (CMS Fachgruppe QCD))

11:20 → 12:00 ATLAS+CMS Combination

Speaker: Sebastian Wuchterl (CERN)

2025HamburgCombination.pdf