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

ContributorsATLAS Collaboration
Published inPhysics letters. B, vol. 843, 137848
Publication date2023
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.

eng
Keywords
  • P p: colliding beams
  • Charge: asymmetry: measured
  • Top: pair production
  • P p: scattering
  • Top: rapidity
  • Rapidity spectrum
  • Photon: associated production
  • Final state: ((n)jet lepton)
  • ATLAS
  • CERN Lab
  • CERN LHC Coll
  • Statistical analysis
  • Data analysis method
  • Experimental results
  • 13000 GeV-cms
Citation (ISO format)
ATLAS Collaboration. Measurement of the charge asymmetry in top-quark pair production in association with a photon with the ATLAS experiment. In: Physics letters. B, 2023, vol. 843, p. 137848. doi: 10.1016/j.physletb.2023.137848
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ISSN of the journal0370-2693
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