Measurement of the charge asymmetry in highly boosted top-quark pair production in s√=s= 8 TeV pppp collision data collected by the ATLAS experiment

In the View the MathML source process the angular distributions of top and anti-top quarks are expected to present a subtle difference, which could be enhanced by processes not included in the Standard Model. This Letter presents a measurement of the charge asymmetry in events where the top-quark pair is produced with a large invariant mass. The analysis is performed on 20.3 fb−1 of pp collision data at View the MathML source collected by the ATLAS experiment at the LHC, using reconstruction techniques specifically designed for the decay topology of highly boosted top quarks. The charge asymmetry in a fiducial region with large invariant mass of the top-quark pair (View the MathML source) and an absolute rapidity difference of the top and anti-top quark candidates within View the MathML source is measured to be 4.2±3.2%, in agreement with the Standard Model prediction at next-to-leading order. A differential measurement in three View the MathML source mass bins is also presented.