Probing Transverse Momentum Dependent Parton Distributions in Charmonium and Bottomonium Production

TL;DR

This paper investigates how unpolarized and linearly polarized gluon distributions affect the transverse momentum and rapidity distributions of charmonium and bottomonium production in proton-proton collisions, using TMD factorization and CEM.

Contribution

It introduces a study of gluon TMDs and their impact on quarkonium production, applying TMD evolution within the color evaporation model for the first time.

Findings

Predicted transverse momentum distributions at LHCb, RHIC, and AFTER energies.

Analyzed the effect of linearly polarized gluons on quarkonium production.

Provided theoretical estimates for future experimental comparisons.

Abstract

We propose the study of unpolarized transverse momentum dependent gluon parton distributions as well as the effect of linearly polarized gluons on transverse momentum and rapidity distributions of $J/\psi$ and $\Upsilon$ production within the framework of transverse momentum dependent factorization employing color evaporation model (CEM) in unpolarized proton-proton collision. We estimate the transverse momentum and rapidity distributions of $J/\psi$ and $\Upsilon$ at LHCb, RHIC and AFTER energies using TMD evolution formalism.