Coherent photoproduction of $J/\psi$ in nucleus-nucleus collisions in the color dipole approach- an update

TL;DR

This paper updates the color dipole model for coherent $J/$ photoproduction in nucleus-nucleus collisions by incorporating $c ar c g$-Fock states and compares the results with recent ALICE and LHCb data.

Contribution

It introduces the inclusion of $c ar c g$-Fock states into the color dipole approach for $J/$ photoproduction and compares predictions with experimental data.

Findings

The updated model better describes recent experimental data.

Inclusion of $c ar c g$-Fock states improves the understanding of the process.

Results show good agreement with ALICE and LHCb measurements.

Abstract

We discuss the role of $c \bar c g$-Fock states in the diffractive photoproduction of $J/\psi$-mesons. We build on our earlier description of the process in the color-dipole approach, where we took into account the rescattering of $c \bar c$ pairs using a Glauber-Gribov form of the dipole-nucleus amplitude. We compare the results of our calculations to recent data on the photoproduction of $J/\psi$ by the ALICE and LHCb collaborations.