Differential cross-section measurements of boosted top quarks at √s = 13 TeV with the ATLAS detector

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Differential cross-section measurements of highly boosted top quarks are presented. The dataset used has an integrated luminosity of 3.2 fb⁻¹, recorded at a centre-of-mass energy of √s=13 TeV with the ATLAS detector at the CERN Large Hadron Collider in 2015. Events are selected in the lepton + jets channel, containing one isolated lepton and a large radius jet that is identified as originating from a top quark using substructure tagging techniques. The measured transverse momentum and absolute rapidity distributions are unfolded to remove detector effects and compared to a range of Monte Carlo simulations. The transverse momentum distribution shows that all Monte Carlo generators used predict a harder spectrum than observed in data, while the rapidity distribution agrees well between MC and data.