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SUMMARY:Beatriz Lopes\, Daniel Stremmer\, "Recent measurements of the tt+$
 \\gamma$production cross section" [CMS\, TH]
DTSTART:20260611T090000Z
DTEND:20260611T103000Z
DTSTAMP:20260629T062000Z
UID:indico-event-1656837@indico.cern.ch
DESCRIPTION:Speakers: Daniel Stremmer (KIT)\, Beatriz Ribeiro Lopes (CERN)
 \n\nAbstract\nThe talk will focus on the recent results from the ATLAS and
  CMS collaborations on measurements of top quark production in association
  with photons\, in particular tt+$\\gamma$\, using Run 2 LHC data. These a
 nalyses probe the electromagnetic coupling of the top quark\, and are inte
 resting also from the modelling perspective\, due to the challenges relate
 d to simulating this process beyond the leading order.\nThe CMS result [ar
 xiv.org:2511.01995] comprises inclusive and differential measurements of t
 he tt+$\\gamma$ cross section\, as well as ratios between the tt+$\\gamma$
  and tt cross sections. The experimental methods used to derive these resu
 lts will be discussed\, including the data-driven background determination
  and the statistical interpretation. These measurements are compared to di
 fferent modelling options as well as to fixed order predictions. We will d
 iscuss the differences and difficulties arising from these predictions reg
 arding the photon isolation and the top-quark modelling in the presence of
  photons.\nOther related recent results\, such as the ATLAS observation of
  tt+$\\gamma\\gamma$ [arxiv:2506.05018] and the CMS tq+$\\gamma$ and tt+$\
 \gamma$ [CMS-PAS-TOP-25-003] will also be briefly shown.\nSpeakers\nBeatri
 z Ribeiro Lopes is a postdoctoral researcher at Ghent University and a me
 mber of the CMS Collaboration. After obtaining her PhD at DESY and Univers
 ity of Hamburg (Germany)\, she spent two years at CERN as a Research Fello
 w. Her research focuses on precision measurements of rare top quark proces
 ses as well as searches for rare decays of the Higgs boson. She currently 
 co-coordinates a physics subgroup at CMS covering measurements of top quar
 k processes with additional hadrons in the final state.\n \nDaniel Stremm
 er got his PhD in 2024 at the RWTH Aachen University. He is currently loc
 ated at the Karlsruhe Institute of Technology (KIT). His research mainly f
 ocuses on higher-order corrections in associated top-quark pair processes 
 and top-quark mass effects in gluon-fusion processes such as HH or ZH.\n\n
 https://indico.cern.ch/event/1656837/
LOCATION:4/2-011 - TH common room (CERN)
URL:https://indico.cern.ch/event/1656837/
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