Impact of unitarization on the $J/\psi$-light meson cross section

TL;DR

This paper studies how unitarization affects the cross sections of $J/$ mesons scattering with light mesons, providing updated calculations within an effective Lagrangian framework to better understand hadronic interactions post-quark-gluon plasma.

Contribution

It presents an updated analysis of $J/$-light meson interactions using unitarized coupled channel amplitudes, incorporating symmetry breaking and focusing on low-energy scattering.

Findings

Calculated cross sections for $J/\psi$ with light mesons.

Compared results with existing literature.

Identified dominant scattering channels.

Abstract

Hidden charm mesons continue playing an essential role as relevant probes to understand the evolution of partonic matter. It is expected that the charmonia that survived the quark-gluon plasma phase suffer collisions with other particles composing the hadronic matter. In this work, we intend to contribute on this subject by presenting an updated study about the interactions of $J/\psi$ with surrounding hadronic medium. The meson-meson interactions are described with a $SU(4)$ effective Lagrangian, and within the framework of unitarized coupled channel amplitudes projected onto s-wave. The symmetry is explicitly broken to $SU(3)$ by suppression of the interactions driven by charmed mesons. We calculate the cross sections for $J/\psi $ scattering by light pseudoscalar mesons ($\pi, K, \eta$) and vector mesons ($\rho, K^\ast, \omega$), as well as their inverse processes. Keeping the validity of this present approach in the low CM energy range, the most relevant channels are evaluated and a comparison of the findings with existing literature is performed.