Gluon shadowing in nuclei and the role of the c c g state in the coherent photoproduction of J/ψ in nucleus-nucleus collisions

2024/06/14 by Łuszczak, Agnieszka, Schäfer, Wolfgang
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2406.10371

Abstract

In this brief note, we confront our results on diffractive photoproduction of J/ψ mesons with the putative gluon shadowing ratio defined as R_g= √σ(γA → J/ψA)/σ_{\rm IA.}, where σ_{\rm IA} is the result in impulse approximation. Building on our earlier description of the process in the color-dipole approach, where we took into account the rescattering of c c states only, we demonstrate that the inclusion of c c g-Fock states improves the description at small x commonly associated with gluon shadowing.

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