Charmonium production in the TMD factorization using the Improved Color Evaporation Model

TL;DR

This paper investigates unpolarized J/ψ production in proton-proton collisions using TMD factorization with the Soft Gluon Resummation approach and the Improved Color Evaporation Model, providing energy-dependent hadronization insights and predictions for NICA.

Contribution

It introduces a combined TMD and Improved Color Evaporation Model approach to describe J/ψ production and hadronization in proton-proton collisions, including energy dependence and experimental predictions.

Findings

Hadronization parameter F^{J/ψ} depends on collision energy.

Model successfully describes experimental data across energies.

Predictions made for J/ψ production at NICA energies.

Abstract

In the article, the study of unpolarized $J/\psi$ production in proton-proton collisions is presented. The Soft Gluon Resummation approach as a TMD framework was used for description of small-$p_T^{}$ production cross section. The Improved Color Evaporation model was considered as an approach to describe hadronization of produced quarks into charmonium state. We find that the experimental data at various center-of-mass energies $\sqrt{s}$ demonstrate the dependence of hadronization parameter $F^{J/\psi}$ on energy. The predictions for $J/\psi$ production in the kinematics of the SPD NICA experiment have been made.