Drell-Yan cross section measurement in the muon channel at the LHC

The first measurement of the Drell-Yan differential cross-section in the muon channel at $\sqrt{s} = 7$ TeV is presented. A data set of 36~pb$^{-1}$ of $pp$ collisions collected by the CMS detector at the LHC during the year 2010 was used for this measurement. Dedicated data-driven methods to estimate the trigger, reconstruction and identification efficiencies and the QCD background were employed. The differential Drell-Yan muon pair production cross-section was measured in the mass range 15--600 GeV and a comparison with theoretical predictions is presented.