UC Santa Cruz

This paper reports inclusive and differential measurements of the tt¯$$t\bar{t}$$ charge asymmetry AC$$A_{\text {C}}$$ in 20.3fb-1$$20.3~{\mathrm{fb}^{-1}}$$ of s=8TeV$$\sqrt{s} = 8~\mathrm TeV{}$$pp$$pp$$ collisions recorded by the ATLAS experiment at the Large Hadron Collider at CERN. Three differential measurements are performed as a function of the invariant mass, transverse momentum and longitudinal boost of the tt¯$$t\bar{t}$$ system. The tt¯$$t\bar{t}$$ pairs are selected in the single-lepton channels (e or μ$$\mu $$) with at least four jets, and a likelihood fit is used to reconstruct the tt¯$$t\bar{t}$$ event kinematics. A Bayesian unfolding procedure is performed to infer the asymmetry at parton level from the observed data distribution. The inclusive tt¯$$t\bar{t}$$ charge asymmetry is measured to be AC=0.009±0.005$$A_{\text {C}}{} = 0.009 \pm 0.005$$ (stat. +$$+$$ syst.). The inclusive and differential measurements are compatible with the values predicted by the Standard Model.