Charm Production and QCD Analysis at HERA and LHC

Abstract

This review is devoted to the study of charm production in ep and pp collisions. The total set of measurements obtained by the two collaborations H1 and ZEUS from HERA and their combination is outlined, as well as complementary data obtained by the LHCb collaboration at the LHC. After fitting the parton distribution functions the charm production cross sections are predicted within perturbative QCD at next-to-leading order using the fixed-flavour-number scheme. Agreement with the data is found. The combined HERA charm data are sensitive to the $c$-quark mass and enabled its accurate determination. The predictions crucially depend upon the knowledge of the gluon distribution function. It is shown that the shape of the gluon distribution based on the HERA data is considerably improved by adding the measurements from LHCb and applicable down to values x of about 10^{-6}, where x is the proton momentum fraction carried by a parton.

arXiv comment105 pages, 108 figures, 22 tables; final version

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Cited by in corpus (11)

• The Large Hadron-Electron Collider at the HL-LHC
• The Structure of the Proton in the LHC Precision Era
• A Critical Appraisal and Evaluation of Modern PDFs
• Impact of heavy-flavour production cross sections measured by the LHCb experiment on parton distribution functions at low x
• Revisiting the D-meson hadroproduction in general-mass variable flavour number scheme
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• Transverse momentum dependent parton densities in processes with heavy quark generations
• Combination of Differential D^{*\pm} Cross-Section Measurements in Deep-Inelastic ep Scattering at HERA
• The ZEUS long term data preservation project
• Probing the strange content of the proton with charm production in charged current at LHeC