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We report a measurement of the mass of the top quark in lepton+jets finalstates of ppbar->ttbar data corresponding to 2.6 fb^{-1} of integratedluminosity collected by the D0 experiment at the Fermilab Tevatron Collider.Using a matrix element method, we combine an insitu jet energy calibration withour standard jet energy scale derived in studies of {\gamma}+jet and dijetevents and employ a novel flavor-dependent jet response correction to measure atop-quark mass of mt = 176.01 +/- 1.64 GeV. Combining this result with ourprevious result obtained on an independent data set, we measure a top-quarkmass of mt = 174.94 +/- 1.49 GeV for a total integrated luminosity of 3.6fb^{-1}.

Precise measurement of the top-quark mass from lepton+jets events at D0