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

The ATLAS collaboration

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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-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 AC=−0.003±0.029 in agreement with the Standard Model expectation.

Original languageEnglish
Article number137848
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume843
DOIs
Publication statusPublished - 10 Aug 2023

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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