Aad, GeorgesAbbott, BradAbbott, D. C.Abeling, KarinBeddall, Andrew JohnÇetin, Serkant AliÖztürk, SertaçŞimşek, Sinem2025-04-182025-04-182023ATLAS Collaboration. (2023). Measurement of the charge asymmetry in top-quark pair production in association with a photon with the ATLAS experiment.0370-26931873-2445http://dx.doi.org/10.1016/j.physletb.2023.137848https://hdl.handle.net/20.500.12713/7170A measurement of the charge asymmetry in top-quark pair (t (t) over bar) production in association with a photon is presented. The measurement is performed in the single-lepton t (t) over bar 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 +/- 0.029 in agreement with the Standard Model expectation. (c) 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).eninfo:eu-repo/semantics/openAccessArticle843121WOS:0012567535000012-s2.0-85165936778Q110.1016/j.physletb.2023.137848Q1