B-quark production at 7 TeV with the CMS experiment

Measurements performed by the CMS experiment of the cross section for inclusive b-quark production in proton-proton collisions at $\sqrt{s} = 7$ TeV are presented. The measurements are based on data collected in 2010. The measurements are based on different methods, such as inclusive jet measurements with secondary vertex tagging or selecting a sample of events containing jets and at least one muon, where the transverse momentum of the muon with respect to the closest jet axis discriminates b events from the background. The measurements of the total and single differential cross sections for $B^+, B^0, B_s$ mesons are also presented. The results are compared with predictions based on perturbative QCD calculations at leading and next-to-leading order.