A model for $J/ψ$ absorption in hadronic matter

The cross sections of $J/\psi$ absorption by $\pi$ and $\rho$ mesons are studied in a meson-exchange model that includes not only the pseudoscalar-pseudoscalar-vector-meson couplings but also the three-vector-meson and four-point couplings. We find that the $J/\psi$ absorption cross sections, $\sigma_{\pi \psi}$ and $\sigma_{\rho \psi}$, are much larger than in a previous study where only pseudoscalar-pseudoscalar-vector-meson couplings were considered. Including form factors at vertices, their thermal averages $<\sigma_{\pi \psi}v >$ and $<\sigma_{\rho \psi}v>$ in a hadronic matter at a temperature of 150 MeV are found to have values of the order of 1 mb and 2 mb, respectively.