The top quark charge asymmetry in $t\bar{t}\gamma$ production at the LHC

Abstract

We consider the top quark charge asymmetry in the process $pp\to t\bar{t}+\gamma$ at the 13 TeV LHC. The genuine tree level asymmetry in the $q\bar{q}$ channel is large with about -12%. However, the symmetric $gg$ channel, photon radiation off top quark decay products, and higher order corrections wash out the asymmetry and obscure its observability. In this work, we investigate these effects at next-to-leading order QCD and check the robustness of theoretical predictions. We find a sizable perturbative correction and discuss its origins and implications. We also study dedicated cuts for enhancing the asymmetry and show that a measurement is possible with an integrated luminosity of 150 fb${}^{-1}$.

6 pages

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Cited by in corpus (10)

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• Off-shell vs on-shell modelling of top quarks in photon associated production
• Complete NLO corrections to top-quark pair production with isolated photons
• Higher-order corrections in $t\bar{t}\gamma$ cross sections
• Measurement of the inclusive and differential $\mathrm{t}\bar{\mathrm{t}}\gamma$ cross sections in the dilepton channel and effective field theory interpretation in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Associated production of a top-quark pair with two isolated photons at the LHC through NLO in QCD
• Measurement of the charge asymmetry in top-quark pair production in association with a photon with the ATLAS experiment
• Climbing to the Top of the ATLAS 13 TeV data
• Inclusive and differential measurements of the $\mathrm{t}\bar{\mathrm{t}}\gamma$ cross section and the $\mathrm{t}\bar{\mathrm{t}}\gamma$ / $\mathrm{t}\bar{\mathrm{t}}$ cross section ratio in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Photon radiation effects in kinematic reconstruction of top quarks