  The mass of the top quark is measured using a sample of t t-bar candidate
events with one electron or muon and at least four jets in the final state,
collected by CMS in pp collisions at sqrt(s) = 7 TeV at the LHC. A total of
5174 candidate events is selected from data corresponding to an integrated
luminosity of 5.0 inverse femtobarns. For each event the mass is reconstructed
from a kinematic fit of the decay products to a t t-bar hypothesis. The
top-quark mass is determined simultaneously with the jet energy scale (JES),
constrained by the known mass of the W boson in q anti-q decays, to be 173.49
+/- 0.43 (stat.+JES) +/- 0.98 (syst.) GeV.
