Cross Sections for pi- and rho-induced Dissociation of J/psi and psi'

TL;DR

This paper calculates the dissociation cross sections of J/psi and psi' by pions and rhos using the quark-interchange model, revealing significant differences in their magnitudes and thresholds.

Contribution

It provides the first detailed evaluation of dissociation cross sections for J/psi and psi' by pions and rhos at low energies using the Barnes and Swanson quark-interchange model.

Findings

J/psi dissociation by pion has a small cross section (~1 mb) with a high energy threshold.

Psi' dissociation by pion has a larger cross section (~5 mb) and a lower threshold.

Rho-induced dissociation cross sections are large near threshold for both states.

Abstract

We evaluate the cross sections for the dissociation of $J/\psi$ and $\psi'$ by $\pi$ and $\rho$ at low collision energies, using the quark-interchange model of Barnes and Swanson. The dissociation cross section for $J/\psi$ by $\pi$ is found to be relatively small with a maximum of about 1 mb and a kinetic energy threshold of 0.65 GeV. The pion-induced $\psi'$ dissociation cross section is found to be much larger, with a maximum of about 5 mb and a lower threshold. Dissociation cross sections for $J/\psi$ and $\psi'$ by $\rho$ mesons are also evaluated and are found to be large near threshold.