Abstract: The production cross section for a W boson and two b jets is measured using proton–proton collisions at vs=7TeV in a data sample collected with the CMS experiment at the LHC corresponding to an integrated luminosity of 5.0 fb-1. The W +bb events are selected in the W ?µ? decay mode by requiring a muon with transverse momentum pT>25GeV and pseudorapidity |?| <2.1, and exactly two b-tagged jets with pT>25 GeV and |?| <2.4. The measured W +bb production cross section in the fiducial region, calculated at the level of final-state particles, is s(pp ?W +bb) ×B(W ?µ?) =0.53 ±0.05 (stat.)±0.09 (syst.)±0.06 (theo.)±0.01 (lum.) pb, in agreement with the standard model prediction. In addition, kinematic distributions of the W +bb system are in agreement with the predictions of a simulation using MADGRAPH and PYTHIA.

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