# Probing the Sivers asymmetries through $\rm J/\psi$ photoproduction in $\rm p^\uparrow p$ collision with forward proton tagging

## TL;DR

This paper investigates the Sivers asymmetries in J/psi photoproduction during polarized proton-proton collisions, analyzing how different evolution models affect the asymmetry's magnitude and sign, with implications for gluon Sivers functions at collider experiments.

## Contribution

It introduces a detailed analysis of Sivers asymmetries in J/psi production using TMDs and compares evolution models, providing new insights into gluon Sivers functions in high-energy collisions.

## Key findings

- Sizable asymmetries depend on the evolution model used.
- The sign and magnitude of asymmetries vary with rapidity and momentum fractions.
- Results are relevant for experiments at RHIC and AFTER@LHC.

## Abstract

In this paper we probe the Sivers asymmetries through $\rm J/\psi$ photoproduction in $\rm p^\uparrow p$ collision within the non-relativistic QCD framework, based on color octet model and the Transverse Momentum Dependent Parton Distributions (TMDs). Both the DGLAP evolution and the TMD evolution are included. The intensity and the sign of the Sivers asymmetry is strongly related on evolution model used to investigate the Gluon Sivers Function (GSF). A sizable asymmetry is obtained as a function of the rapidity, $\rm log{(x_{\gamma})}$ or $\rm log{(x_{g})}$ dependence using a recent parametrization of GSF at the RHIC and AFTER@LHC experiments with the LHC planned forward detector acceptances.