Measurement of the charge asymmetry in top-quark pair production in the lepton-plus-jets final state in pp collision data at ... formula ... with the ATLAS detector

摘要

This paper reports inclusive and differential measurements of the tt¯ charge asymmetry AC in 20.3 fb^-1 of s=8TeV 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¯ system. The tt¯ pairs are selected in the single-lepton channels (e or μ) with at least four jets, and a likelihood fit is used to reconstruct the tt¯ event kinematics. A Bayesian unfolding procedure is performed to infer the asymmetry at parton level from the observed data distribution. The inclusive tt¯ charge asymmetry is measured to be AC = 0.009 ± 0.005 (stat. +  syst.). The inclusive and differential measurements are compatible with the values predicted by the Standard Model.