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Measurement of jet shapes in top-quark pair events at √ s = 7 TeV using the ATLAS detector

A measurement of jet shapes in top-quark pair events using 1 . 8 fb − 1 of √ s = 7 TeV pp collision data recorded by the ATLAS detector at the LHC is presented. Samples of top-quark pair events are selected in both the single-lepton and dilepton ﬁnal states. The differential and integrated shapes of the jets initiated by bottom-quarks from the top-quark decays are compared with those of the jets originated by light-quarks from the hadronic W -boson decays W → q ¯ q (cid:4) in the single-lepton channel. The light-quark jets are found to have a narrower distribution of the momentum ﬂow inside the jet area than b -quark jets.