The impact of the intrinsic charm quark content of the proton on differential $\gamma+c$ cross section

TL;DR

This paper investigates how the non-perturbative intrinsic charm quark content of the proton influences the differential cross section of gamma plus charm-jet production in proton-proton and proton-antiproton collisions, comparing theoretical predictions with experimental data.

Contribution

It introduces a detailed analysis of intrinsic charm effects on gamma+c production and provides a code for evolving intrinsic charm distributions across different scales and Fock states.

Findings

Intrinsic charm significantly affects gamma+c cross sections.

Theoretical predictions align with Tevatron data.

Predictions for LHC energies are provided.

Abstract

We present a comparative analysis of the impact of the non-perturbative intrinsic charm quark content of the proton on differential cross section of $\gamma +c $-jet in $ pp $ and $ p\bar{p} $ collisions, for the kinematic regions that are sensitive to this contribution. We discuss the $ Q^2 $ evolution of intrinsic quark distributions and present a code which provide these distributions as a function of $ x $ and $ Q^2 $ for any arbitrary Fock state probability. For the $ p\bar{p} $ collisions at the Tevatron, the results are compared with the recent experimental data of D0 at $\sqrt{s} =1.96$ TeV and also predictions for $ pp $ collisions at $\sqrt{s} =8$ TeV and $\sqrt{s} =13$ TeV for the LHC.