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

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 they are much larger than in a previous study where only pseudoscalar-pseudoscalar-vector-meson couplings were considered. Including form factors at interaction vertices, the $J/\psi$ absorption cross sections $\sigma_{\pi \psi}$ and $\sigma_{\rho \psi}$ have values on the order of 7 mb and 3 mb, respectively. Their thermal averages in a hadronic matter at temperature T=150 MeV are, respectively, about 1 mb and 2 mb.