Measurement of the charge asymmetry in dileptonic decays of top quark pairs in pp collisions at s = 7 $$ \sqrt{s}=7 $$ TeV using the ATLAS detector

Abstract

A measurement of the top-antitop (t t) charge asymmetry is presented using data corresponding to an integrated luminosity of 4.6 fb -1 of LHC pp collisions at a centreof-mass energy of 7 TeV collected by the ATLAS detector. Events with two charged leptons, at least two jets and large missing transverse momentum are selected. Two observables are studied: A C based on the identified charged leptons, and A t t C , based on the reconstructed t t final state. The asymmetries are measured to be A C = 0.024 0.015 (stat.) 0.009 (syst.) , A t t C = 0.021 0.025 (stat.) 0.017 (syst.) .