Measurement of the production cross sections of Z bosons in association with b jets in pp collisions at $\surd s$ = 7 TeV with the CMS detector

The mechanism of production of heavy-flavoured mesons, in association with vector bosons like Z+b in the Standard Model is only partially understood. The deep understanding of these processes is furthermore required by Higgs and BSM analysis with similar final states. Using the 2.1 fb$^{-1}$ LHC proton-proton collision data collected in 2011 at a centre of mass energy of 7 \nolinebreak[1]TeV by the CMS detector, the final measurements of Z+b inclusive, Z+1b exclusive and Z+2b inclusive cross sections are determined for b hadron jets having p$_{T} >$ 25 GeV and $ \mid \eta \mid < 2.1$. Results and kinematics are compared to Monte Carlo predictions.