Measurement of the Z / γ *+ b-jet cross section in pp collisions at √s = 7 TeV

Journal of High Energy Physics 2012.6 (2012): 53 reproduced by permission of Scuola Internazionale Superiore di Studi Avanzati (SISSA)The production of b jets in association with a Z/γ*boson is studied using proton-proton collisions delivered by the LHC at a centre-of-mass energy of 7TeV and recorded by the CMS detector. The inclusive cross section for Z/γ*+b-jet production is measured in a sample corresponding to an integrated luminosity of 2.2 fb -1. The Z/γ*+b-jet cross section with Z/γ*→ℓℓ (where ℓ ℓ = ee or μ μ) for events with the invariant mass 60 25 GeV and |η| 0:5 is found to be 5:84±0:08 (stat.) ±0:72 (syst.) -0:55 +0:25 (theory) pb. The kinematic properties of the events are also studied and found to be in agreement with the predictions made by the MADGRAPH event generator with the parton shower and the hadronisation performed by PYTHI