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Exclusive $J/Ψ$ Production and Gluon GPDs Effects

S. V. Goloskokov, Ya-Ping Xie

Abstract

Study of exclusive photoproduction of $J/Ψ$ mesons was carried out in a factorization approach. Generalized parton distributions (GPDs) for gluons, which play an important role here, are constructed using the double distribution representation. The obtained cross sections of $J/Ψ$ production in a wide energy range are in good agreement with the experiment. The spin asymmetries in the $J/Ψ$ production were estimated. These calculations were extended to the of $J/Ψ$ mesons production in ultraperipherical $pp$ collisions. It was shown a good agreement of our results with the LHCb data. Predictions have been made for the NICA energy range. The model results can be used to study the gluon GPDs in future colliders.

Exclusive $J/Ψ$ Production and Gluon GPDs Effects

Abstract

Study of exclusive photoproduction of mesons was carried out in a factorization approach. Generalized parton distributions (GPDs) for gluons, which play an important role here, are constructed using the double distribution representation. The obtained cross sections of production in a wide energy range are in good agreement with the experiment. The spin asymmetries in the production were estimated. These calculations were extended to the of mesons production in ultraperipherical collisions. It was shown a good agreement of our results with the LHCb data. Predictions have been made for the NICA energy range. The model results can be used to study the gluon GPDs in future colliders.
Paper Structure (4 sections, 10 equations, 4 figures)

This paper contains 4 sections, 10 equations, 4 figures.

Table of Contents

  1. Introduction
  2. Handbag approach for heavy meson leptoproduction
  3. $J/\Psi$ production in lepton-proton reactions
  4. $J/\Psi$ production in proton-proton ultraperipheral collisions

Figures (4)

  • Figure 1: Left:Ratio of $ReM/Im M$ parts of $J/\Psi$ production amplitudes. $J/\psi$ differential cross section vs $|t|$ at different $Q^2$, right graph. Cross sections are scaled by the factor shown in the graph.
  • Figure 2: Left: $J/\psi$ total cross section at HERA for fixed $Q^2$ vs the energy $W$ and at $Q^2 = 0$ from low to very high energies, right graph.
  • Figure 3: Left: Single spin asymmetry $A_N$ versus W at $Q^2$ = 0 GeV$^2$ and double spin correlation $A_{LL}$, right graph.
  • Figure 4: Left: Exclusive $J/\psi$ production in proton-proton ultraperipheral collisions as a function of rapidity at LHCb, and for NICA energy range, right graph.