Single and pair $J/\psi$ production in the Improved Color Evaporation Model using the Parton Reggeization Approach

TL;DR

This paper investigates single and pair $J/$ meson production in high-energy hadron collisions using an advanced theoretical framework that incorporates $k_T$-factorization and Reggeized partons, providing detailed numerical analysis.

Contribution

It introduces a novel application of the Improved Color Evaporation Model combined with the Parton Reggeization Approach for $J/$ production, including contributions from multiple scattering mechanisms.

Findings

Quantitative comparison of single and double parton scattering contributions.

Implementation of the model using the KaTie Monte Carlo generator.

Insights into the role of Reggeized gluons and quarks in $J/$ production.

Abstract

In the article, we study single and pair $J/\psi$ hadroproduction in the Improved Color Evaporation Model via the Parton Reggeization Approach. The last one is based on $k_T$-factorization of hard processes in multi-Regge kinematics, the Kimber-Martin-Ryskin-Watt model for unintegrated parton distribution functions, and the effective field theory of Reggezied gluons and quarks, suggested by L.N. Lipatov. We compare contributions from the single and double parton scattering mechanisms in the pair $J/\psi$ production. The numerical calculations are realized using the Monte-Carlo event generator KaTie.