Measurement of the differential photon+ c-jet cross section and the ratio of differential photon+ c and photon+ b cross sections in proton-antiproton collisions at sqrt(s) = 1.96 TeV

Abstract

We present measurements of the differential cross section $d\sigma /d{p}_T^{\gamma }$ for the associated production of a $c$-quark jet and an isolated photon with rapidity $|y^{\gamma }|<1.0$ and transverse momentum $30<p_T^{\gamma }<300$ GeV. The $c$-quark jets are required to have $|y^{jet}|<1.5$ and $p_T^{jet}>15$ GeV. The ratio of differential cross sections for photon+ c and photon+ b production as a function of $p_T^{\gamma }$ is also presented. The results are based on data corresponding to an integrated luminosity of 8.7 fb${}^{-1}$ recorded with the D0 detector at the Fermilab Tevatron $p\bar{p}$ Collider at $\sqrt{s}=$1.96 TeV. The obtained results are compared to next-to-leading order perturbative QCD calculations using various parton distribution functions, to predictions based on the $k_T$-factorization approach, and to predictions from the Sherpa and Pythia Monte Carlo event generators.

Submitted to Phys. Lett. B

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• Novel Heavy-Quark Physics Phenomena
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