Measurement of the differential γ+2b -jet cross section and the ratio Ï(γ+2b-jets)/Ï(γ+b-jet) in pp¯ collisions at s=1.96 TeV
V.M. Abazov (Joint Institute for Nuclear Research, Dubna, Russia); B. Abbott (University of Oklahoma, Norman, OK, 73019, USA); B.S. Acharya (Tata Institute of Fundamental Research, Mumbai, India); M. Adams (University of Illinois at Chicago, Chicago, IL, 60607, USA); T. Adams (Florida State University, Tallahassee, FL, 32306, USA); et al - Show all 364 authors
We present the first measurements of the differential cross section dÏ/dpTγ for the production of an isolated photon in association with at least two b -quark jets. The measurements consider photons with rapidities |yγ|<1.0 and transverse momenta 30
15 GeV and |yjet|<1.5 . The ratio of differential production cross sections for γ+2 b -jets to γ+b -jet as a function of pTγ is also presented. The results are based on the protonâantiproton collision data at s=1.96 TeV collected with the D0 detector at the Fermilab Tevatron Collider. The measured cross sections and their ratios are compared to the next-to-leading order perturbative QCD calculations as well as predictions based on the kT -factorization approach and those from the sherpa and pythia Monte Carlo event generators.