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Journal of High Energy Physics


The mass of the top quark is measured using a sample of tt candidate events with one electron or muon and at least four jets in the nal state, collected by CMS in pp collisions at p s = 7TeV at the LHC. A total of 5174 candidate events is selected from data corresponding to an integrated luminosity of 5.0 fb􀀀1. For each event the mass is reconstructed from a kinematic t of the decay products to a tt hypothesis. The topquark mass is determined simultaneously with the jet energy scale (JES), constrained by the known mass of the W boson in qq decays, to be 173:49+-0:43 (stat.+JES)+-0:98 (syst.) GeV.


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