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

Abstract

We present the first measurements of the differential cross section $d\sigma /d{p}_T^{\gamma }$ for the production of an isolated photon in association with at least two $b$-quark jets. The measurements consider photons with 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 $\gamma +2b$-jets to $\gamma +b$-jet as a function of $p_T^{\gamma }$ is also presented. The results are based on the proton-antiproton collision data at $\sqrt{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 $k_T$-factorization approach and those from the SHERPA and PYTHIA Monte Carlo event generators.

arXiv comment10 pages, 8 figures, Submitted to Phys. Lett. B

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• Impact of Charm H1-ZEUS Combined data and Determination of the Strong Coupling in Two Different Schemes