Measurement of the top quark pair production cross section in the semi-leptonic channels at $\sqrt{s} = 7$ TeV with the CMS experiment

A measurement of the top quark pair production cross section is presented using between $0.8$ and $1.1 \, \mathrm{fb}^{-1}$ of data recorded by the CMS experiment at the Large Hadron Collider at a center-of-mass energy of $7$ TeV. The cross-section measurement is performed in the semi-leptonic final state with events containing one lepton, either a muon or an electron, missing transverse energy and jets. The cross-section measurement yields $164.4 \pm 2.8 \mathrm{(stat.)} \pm 11.9 \mathrm{(syst.)} \pm 7.4 \mathrm{(lum.)}$ pb which is consistent with higher order QCD calculations.