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.
Measurement of the charge asymmetry in top-quark pair production in association with a photon with the ATLAS experiment / Betti, A., DE SALVO, A., Di Domenico, Antonio., Dionisi, Carlo., Bini, C., Luci, C., POMPA PACCHI, E., Morodei, F., Lacava, F., SAFAI TEHRANI, F., Artoni, G., Santi, L., Padovano, G., Martinelli, L., Maiani, L., Bauce, M., Gauzzi, P., Gentile, S., Giagu, S., Ippolito, V., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 843:(2023), pp. 1-21. [10.1016/j.physletb.2023.137848]
Measurement of the charge asymmetry in top-quark pair production in association with a photon with the ATLAS experiment
Betti Alessandra;De Salvo Alessandro;Di Domenico Antonio.;Dionisi Carlo.;Bini Cesare;Luci Claudio;Pompa Pacchi Elena;Morodei Federico;Lacava Francesco;Safai Tehrani Francesco;Artoni Giacomo;Santi Lorenzo;Padovano Giovanni;Martinelli Luca;Maiani Luciano;Bauce Matteo;Gauzzi Paolo;Gentile Simonetta;Giagu Stefano;Ippolito Valerio;Padovano Giovanni
2023
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.| File | Dimensione | Formato | |
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