A measurement of the charge asymmetry in top-quark pair ($t\bar{t}$)production in association with a photon is presented. The measurement isperformed in the single-lepton $t\bar{t}$ decay channel using proton-protoncollision data collected with the ATLAS detector at the Large Hadron Colliderat 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 chargeasymmetry is obtained from the distribution of the difference of the absoluterapidities of the top quark and antiquark using a profile likelihood unfoldingapproach. It is measured to be $A_\text{C}=-0.003 \pm 0.029$ in agreement withthe Standard Model expectation.
Measurement of the charge asymmetry in top-quark pair production in association with a photon with the ATLAS experiment
Capua, M;Mastroberardino, A;Meoni, E;Schioppa, M;Tassi, E;
2022-01-01
Abstract
A measurement of the charge asymmetry in top-quark pair ($t\bar{t}$)production in association with a photon is presented. The measurement isperformed in the single-lepton $t\bar{t}$ decay channel using proton-protoncollision data collected with the ATLAS detector at the Large Hadron Colliderat 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 chargeasymmetry is obtained from the distribution of the difference of the absoluterapidities of the top quark and antiquark using a profile likelihood unfoldingapproach. It is measured to be $A_\text{C}=-0.003 \pm 0.029$ in agreement withthe Standard Model expectation.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
