Measurement of the charge asymmetry in dileptonic decays of top quark pairs in proton-proton collisions at 7 TeV using the ATLAS detector

Abstract

A measurement of the top--antitop ($t\bar{t}$) charge asymmetry is presented using 2011 LHC data collected by the ATLAS detector corresponding to an integrated luminosity of 4.6 fb${}^{-1}$ at a centre-of-mass energy of 7 TeV. The analysis is performed in the dilepton channel, and two different observables are studied: $A_{\mathrm{C}}^{\ell \ell }$, based on the identified charged leptons, and $A_{\mathrm{C}}^{t\bar{t}}$, based on the reconstructed $t\bar{t}$ final state. The asymmetries, measured to be $A_{\mathrm{C}}^{\ell \ell }=0.024\pm 0.015(stat.)\pm 0.009(syst.)$ and $A_{\mathrm{C}}^{t\bar{t}}=0.021\pm 0.025(stat.)\pm 0.017(syst.)$, are in agreement with the Standard Model predictions.

arXiv commentProceedings of the TOP2014 conference