Combination of ATLAS and CMS $t\bar{t}$ charge asymmetry measurements using LHC proton-proton collisions at $\sqrt{s}=7$ TeV

A combination of measurements of the charge asymmetry in $t\bar{t}$ events performed by the ATLAS and CMS collaborations is presented. The analyzed datasets correspond to an integrated luminosity of 4.7 $fb^{−1}$ for ATLAS and 5.0 fb$^{−1}$ for CMS of proton-proton collisions at a centre-of-mass energy of 7 TeV from the LHC. In both analyses events with a lepton+jets signature, i.e. one electron or muon and at least four jets, are analyzed. The resulting combined LHC measurement of the charge asymmetry in $t\bar{t}$ events at $\sqrt{s}=7$ TeV is: $A_C = 0.005 \pm 0.007(stat.) \pm 0.006(syst.)$ in agreement with the prediction from the Standard Model.