W/Z+jets with the CMS detector

We present a study of jet production in association with W and Z bosons in proton-proton collisions at $\sqrt{s}$ = 7 TeV using the full 2010 data set collected by the CMS experiment corresponding to an integrated luminosity of 36$\pm$4 pb$^{-1}$. The production of vector bosons with jets provides a stringent and important test of perturbative QCD, and is an important background to the study of top quark properties and in searches for new physics. We report the inclusive rates of jets produced (normalized to the total cross section) as well as the ratios $\sigma(V+(n+1)$-jets)/$\sigma(V+n$-jets) for a jet threshold of 30 GeV. We also present a measurement of $Z \rightarrow ll +b$ and the first test of the Berends-Giele scaling at $\sqrt{s}$ = 7 TeV.