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In the $pp \rightarrow t\bar{t}$ process the angular distributions of top andanti-top quarks are expected to present a subtle difference, which could beenhanced by processes not included in the Standard Model. This Letter presentsa measurement of the charge asymmetry in events where the top-quark pair isproduced with a large invariant mass. The analysis is performed on 20.3fb$^{-1}$ of $pp$ collision data at $\sqrt{s} =$ 8 TeV collected by the ATLASexperiment at the LHC, using reconstruction techniques specifically designedfor the decay topology of highly boosted top quarks. The charge asymmetry in afiducial region with large invariant mass of the top-quark pair ($m_{t\bar{t}}> $ 0.75 TeV) and an absolute rapidity difference of the top and anti-top quarkcandidates within $-$2 $ < |y_t| - |y_{\bar{t}}| <$ 2 is measured to be 4.2$\pm$ 3.2%, in agreement with the Standard Model prediction at next-to-leadingorder. A differential measurement in three $t\bar{t}$ mass bins is alsopresented.

physics letters b

Measurement of the charge asymmetry in highly boosted top-quark pair  production in $\sqrt{s} =$ 8 TeV $pp$ collision data collected by the ATLAS  experiment