Measurement of the charge asymmetry in top-quark pair production in association with a photon with the ATLAS experiment
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(Published version)
Date
2023
Authors
Aad, G.
Abbott, B.
Abbott, D.C.
Abeling, K.
Abidi, S.H.
Aboulhorma, A.
Abramowicz, H.
Abreu, H.
Abulaiti, Y.
Abusleme Hoffman, A.C.
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Journal article
Citation
Physics Letters B, 2023; 843:137848-1-137848-21
Statement of Responsibility
The ATLAS Collaboration
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Abstract
A measurement of the charge asymmetry in top-quark pair (t¯t) production in association with a photon is presented. The measurement is performed in the single-lepton t¯tdecay channel using proton–protoncollision data collected with the ATLAS detector at the Large Hadron Collider at CERN at a centre-of-mass-energy of 13TeV during the years 2015–2018, corresponding to an integrated luminosity of 139fb−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 ±0.029in agreement with the Standard Model expectation.
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Available online 20 June 2023
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© 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/). Funded by SCOAP3.