Measurement of the differential γ+2bγ+2b-jet cross section and the ratio σ(γ+2b-jets)/σ(γ+b-jet)σ(γ+2b-jets)/σ(γ+b-jet) in pp¯ collisions at s=1.96 TeV

We present the first measurements of the differential cross section dσ/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|yγ|<1.0 and transverse momenta 3015 GeV and |yjet|<1.5|yjet|<1.5. The ratio of differential production cross sections for γ+2γ+2b  -jets to γ+bγ+b-jet as a function of pTγ is also presented. The results are based on the proton–antiproton 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 kTkT-factorization approach and those from the sherpa and pythia Monte Carlo event generators.