Probing the gluon density of the proton in the exclusive photoproduction of vector mesons at the LHC: a phenomenological analysis

2015/11/30 by V. P. Gonçalves, V. P. Goncalves, L. A. S. Martins +2 · 1 citation
Physics and Astronomy · #Gluon #HERA #Hadron #High-Energy Particle Collisions Research #Large Hadron Collider #Meson #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Parton #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quark #Vector meson #hep-ex #hep-ph

paper · pdf · doi:10.1140/epjc/s10052-016-3917-z

8 pages, 6 figures, 1 table. Version published in European Physical Journal C

openalex publication_date 2016/02/01 · arxiv created 2016/04/03 · arxiv updated 2016/04/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

The current uncertainty on the gluon density extracted from the global parton analysis is large in the kinematical range of small values of the Bjorken-x variable and low values of the hard scale Q² . An alternative to reduces this uncertainty is the analysis of the exclusive vector meson photoproduction in photon–hadron and hadron–hadron collisions. This process offers a unique opportunity to constrain the gluon density of the proton, since its cross section is proportional to the gluon density squared. In this paper we consider current parametrisations for the gluon distribution and estimate the exclusive vector meson photoproduction cross section at HERA and LHC using the leading logarithmic formalism. We perform a fit of the normalisation of the γ h cross section and the value of the hard scale for the process and demonstrate that the current LHCb experimental data are better described by models that assume a slow increasing of the gluon distribution at small x and low Q² .

Citations

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• Dynamical parton distributions from DGLAP equations with nonlinear corrections