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

G. Aad, B. Abbott, D.C. Abbott, K. Abeling, S.H. Abidi, A. Aboulhorma, H. Abramowicz, H. Abreu, Y. Abulaiti, A.C. Abusleme Hoffman, …
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 卷.843, 137848
08/2023
DOI: https://doi.org/10.1016/j.physletb.2023.137848

摘要

Nuclear and High Energy Physics
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-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.

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