Measurement of the top quark mass in the l+jets channel

We present a measurement of the top quark mass using events with one charged lepton (muon or electron) and at least four jets in the final state, collected by CMS in $pp$ collisions at $\sqrt{s} = 7$ TeV. From the full 2010 dataset, corresponding to an integrated luminosity of 36 pb$^{-1}$, 637 candidate events are selected. The top quark mass is measured to be $m_{\textrm{t}} = 173.1\pm 2.1 \mathrm{(stat)} ^{+2.8}_{-2.5} \mathrm{(syst)}$~GeV. A combination with the CMS results obtained in the dilepton channel on the same data sample, yields $m_{\textrm{t}} = 173.4 \pm 1.9 \mathrm{(stat)} \pm 2.7 \mathrm{(syst)}$~GeV.