Production of $\psi (4040)$, $\psi (4160)$, and $\psi (4415)$ mesons in strong interactions

TL;DR

This paper investigates the production of specific charmonium states in heavy-ion collisions by modeling inelastic meson scattering processes with temperature-dependent cross sections, revealing their relative abundances during hadronic matter evolution.

Contribution

It introduces a comprehensive model of charmonium production via inelastic scattering with temperature-dependent cross sections in heavy-ion collisions.

Findings

The $ ext{ψ}(4040)$ has the highest number density among the three states.

Cross sections vary significantly with temperature during hadronic matter evolution.

The model predicts the relative abundances of charmonium states in Pb-Pb collisions.

Abstract

Using the inelastic scattering of charmed strange mesons by open-charm mesons in hadronic matter produced in Pb-Pb collisions at the Large Hadron Collider, we study the production of $\psi (4040)$, $\psi (4160)$, and $\psi (4415)$ mesons. Master rate equations are established for inelastic scattering. The scattering is caused by quark interchange in association with color interactions between all constituent pairs in different mesons. We consider fifty-one reactions between charmed strange and open-charm mesons. Unpolarized cross sections for the reactions are obtained from a temperature-dependent interquark potential. The temperature dependence of the cross sections causes the contributions of the reactions to the production of $\psi (4040)$, $\psi (4160)$, and $\psi (4415)$ to change with decreasing temperature during the evolution of hadronic matter. For central Pb-Pb collisions at $\sqrt{s_{NN}}=5.02$ TeV, the master rate equations reveal that the $\psi(4040)$ number density is larger than the $\psi(4160)$ number density which is larger than the $\psi(4415)$ number density.