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CMS_2017_I1518399

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Measurement of the differential and normalised differential tˉt production cross section as a function of the leading jet mass. The measurement was performed in the lepton+jets channel and the fiducial measurement phase space is enriched with events where the leading jet includes all decay products of a hadronically decaying top quark. This analysis is to be run on tˉt simulation. The objects are defined as follows - Lepton: electron or muon originating from the decay of a W boson - Jets: jets are clustered from final state particles using the Cambridge-Aachen algorithm with a distance parameter of 1.2. If a lepton overlaps with a jet (distance in the eta-phi plane smaller 1.2) its four momentum is subtracted from the four momentum of the jet. Definition of the particle level phase space: - only tˉt decays with one top quark decaying hadronically and one top quark decaying leptonically including an electron or muon from the W decay. - lepton \pt>45GeV and |η|<2.1 - at least one jet with \pt>400GeV and |η|<2.5 - a second jet with \pt>150GeV and |η|<2.5 - veto on additional jets with \pt>150GeV and |η|<2.5 - distance between the second jet and the lepton in the eta-phi plane ΔR(jet2,lepton) smaller 1.2 - invariant mass of the leading jet larger than the invariant mass of the combination of the second jet and lepton The differential and normalised differential cross section was measured as a function of the leading jet mass.

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