Measurement of the charge asymmetry in top-quark pair production in association with a photon with the ATLAS experiment

The ATLAS collaboration
Aad, Georges , Abbott, Braden Keim , Abbott, Dale , Abeling, Kira , Abidi, Haider , Aboulhorma, Asmaa , Abramowicz, Halina , Abreu, Henso , Abulaiti, Yiming , Abusleme, Angel
Phys.Lett.B 843 (2023) 137848, 2023.

Abstract (data abstract)
CERN-LHC-ATLAS. A measurement of the charge asymmetry in top-quark pair ($t\bar{t}$) production in association with a photon is presented. The measurement is performed in the single-lepton $t\bar{t}$ decay channel using proton-proton collision data collected with the ATLAS detector at the Large Hadron Collider at CERN at a centre-of-mass-energy of 13 TeV during the years 2015-2018, corresponding to an integrated luminosity of 139 fb$^{-1}$. The charge asymmetry is obtained from the distribution of the difference of the absolute rapidities of the top quark and antiquark using a profile likelihood unfolding approach. It is measured to be $A_{C} = -0.003 \pm 0.029$ in agreement with the Standard Model expectation.

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