Probing TMDs in heavy quarkonium production in $pp$ collision

TL;DR

This paper explores how heavy quarkonium production in proton-proton collisions can be used to investigate gluon transverse momentum dependent distributions, providing insights into gluon polarization effects.

Contribution

It introduces a method using the color evaporation model and generalized factorization to probe unpolarized and linearly polarized gluon TMDs through quarkonium production.

Findings

Results align with experimental data

Demonstrates sensitivity of quarkonium production to gluon TMDs

Provides a framework for future gluon polarization studies

Abstract

We present a recent calculation of $J/\psi$ and $\Upsilon$ production in unpolarized $pp$ collision and show that this can be used to probe the unpolarized gluon as well as the linearly polarized gluon transverse momentum dependent parton distributions (TMDs). We use the color evaporation model for the heavy quarkonium production and use a generalized factorized form of the cross section. We compare the results with experimental data.