Abstract
Measurements of the top-antitop quark pair production charge asymmetry in the dilepton channel, characterized by two high-pT leptons (electrons or muons), are presented using data corresponding to an integrated luminosity of 20.3 fb_1 from pp collisions at a center-of-mass energy sí=8 TeV collected with the ATLAS detector at the Large Hadron Collider at CERN. Inclusive and differential measurements as a function of the invariant mass, transverse momentum, and longitudinal boost of the ttÀ system are performed both in the full phase space and in a fiducial phase space closely matching the detector acceptance. Two observables are studied: A__C based on the selected leptons and AttÀC based on the reconstructed ttÀ final state. The inclusive asymmetries are measured in the full phase space to be A__C=0.008±0.006 and AttÀC=0.021±0.016, which are in agreement with the Standard Model predictions of A__C=0.0064±0.0003 and AttÀC=0.0111±0.0004.
