Measurements of b-quark production and bb(bar) angular correlations

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 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. In addition, measurements of the angular correlations between beauty and anti-beauty hadrons produced in LHC pp collisions at sqrt{s}=7 TeV are presented, probing for the first time the small angular separation region. The results are compared with predictions based on perturbative QCD calculations at leading and next-to-leading order.