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We present the first measurements of the differential cross section$d\sigma/dp_{T}^{\gamma}$ for the production of an isolated photon inassociation with at least two $b$-quark jets. The measurements consider photonswith rapidities $|y^\gamma| < 1.0$ and transverse momenta $30 < p_{T}^{\gamma}< 200$~\GeV. The $b$-quark jets are required to have $p_T^{jet}>15$ GeV and $|y^{jet}| < 1.5$. The ratio of differential production cross sections for$\gamma+2~b$-jets to $\gamma+b$-jet as a function of $p_{T}^{\gamma}$ is alsopresented. The results are based on the proton-antiproton collision data at$\sqrt{s}=$1.96~\TeV collected with the D0 detector at the Fermilab TevatronCollider. The measured cross sections and their ratios are compared to thenext-to-leading order perturbative QCD calculations as well as predictionsbased on the $k_{T}$-factorization approach and those from the SHERPA andPYTHIA Monte Carlo event generators.

physics letters b

Measurement of the differential $\gamma+2~b$-jet cross section and the  ratio $\sigma$($\gamma+2~b$-jets)/$\sigma$($\gamma+b$-jet) in $p\bar{p}$  collisions at $\sqrt{s}$=1.96 TeV