Inclusive b-jet production measurement on early CMS data

We describe a measurement of the inclusive b-jet production in pp collisions at sqrt(s) = 7 TeV. The analysis has been done on the first physics data collected at a centre of mass engery of 7 TeV by the CMS experiment at the Large Hadron Collider at CERN. To improve the low $p_T$ measurement, the jets are reconstructed with the Particle Flow algorithm. The experimental uncertainties from jet energy corrections, jet energy resolutions and luminosity are reduced by taking a ratio to the inclusive jet production cross section. We're using a simple secondary vertex high purity tagger, which is one of the most reliable b-taggers for this early measurement, for selecting a jet sample with high b-jet purity. To measure the b fractions in the tagged jet data sample, we make a template fit to the secondary vertex mass. Our estimation of the b-tagging efficiency is taken from Monte Carlo simulation. Thus our studies on LO+NLO contributions from flavor creation, flavor excitation and gluon splitting are shown as well.