A look at the influence of the $J/\psi$ transverse momentum on shadowing

TL;DR

This paper investigates how the transverse momentum of $J/eta$ particles influences shadowing effects in nuclear collisions, using a new approach that incorporates physical constraints and compares two shadowing models.

Contribution

It introduces a novel method to explicitly analyze the $p_T$-dependence of shadowing in $J/eta$ production, combining physical constraints with Monte Carlo simulations.

Findings

First prediction of $J/eta$ nuclear modification factor as a function of $p_T$.

Comparison of shadowing models with experimental data.

Insights into the role of shadowing and nuclear absorption in $J/eta$ production.

Abstract

Stringent physical constraints relate the $J/\psi$ produced at a given transverse momentum $p_T$ to the Bjorken-$x$ of the initial gluons. We present a new approach which takes them into account in order to explicitely investigate the $p_T$-dependence of the shadowing effect on the $J/\psi$ production. Using the $J/\psi$ rapidity and $p_T$ spectra extracted from $\sqrt{s}=200\mathrm{GeV}$ p + p data from PHENIX, we build a Glauber Monte-Carlo code which includes shadowing in two alternative ways: multiple scattering corrections or $Q^2$ evolution of parton densities. We present our results in d + Au collisions at the same energy, notably providing the first prediction of the $J/\psi$ nuclear modification factor as a function of $p_T$, and compare them to the available data by adding some nuclear absorption effect.