Cross Sections for π - and ρ - induced Dissociation of J / ψ and ψ ′ Cheuk -

We evaluate the cross sections for the dissociation of J/ψ and ψ ′ by π and ρ at low collision energies, using the quark-interchange model of Barnes and Swanson. The dissociation cross section for J/ψ by π 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 ψ ′ 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/ψ and ψ ′ by ρ mesons are also evaluated and are found to be large near threshold.