Abstract
A measurement of the charge asymmetry in top-quark pair (tt¯) production in association with a photon
is presented. The measurement is performed in the single-lepton tt¯ decay channel using proton–proton
collision data collected with the ATLAS detector at the Large Hadron Collider at CERN at a centre-of-massenergy 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 AC =
−0.003 ± 0.029 in agreement with the Standard Model expectation.
