Measurement of the top-quark mass in all-jets ... formula ... events in pp collisions at ... formula ... TeV

摘要

The mass of the top quark is measured using a sample of tt¯ candidate events with at least six jets in the final state. The sample is selected from data collected with the CMS detector in pp collisions at s=7 TeV in 2011 and corresponds to an integrated luminosity of 3.54 fb^-1. The mass is reconstructed for each event employing a kinematic fit of the jets to a tt¯ hypothesis. The top-quark mass is measured to be 173.49 ± 0.69 (stat.) ± 1.21 (syst.) GeV. A combination with previously published measurements in other decay modes by CMS yields a mass of 173.54 ± 0.33 (stat.) ± 0.96 (syst.) GeV.