ar X iv : n uc l - th / 0 50 10 74 v 1 2 8 Ja n 20 05 Charm production in antiproton - nucleus collisions at the J / ψ and the ψ ′ thresholds

Charm production in antiproton-nucleus collisions at the J/ψ and the ψ ′ thresholds Abstract We discuss the production of charmonium states in antiproton-nucleus collisions at the ψ ′ threshold. It is explained that measurements in ¯ pA collisions will allow to get new information about the strengths of the inelastic J/ψN, ψ ′ N interaction, on the production of Λc and ¯ D in charmonium-nucleon interactions and for the first time about nondiagonal transitions ψ ′ N → J/ψN. The inelastic J/ψ-nucleon cross section is extracted from the comparison of hadron-nucleus collisions with hadron-nucleon collisions. We extract the total J/ψ nucleon cross section from photon-nucleon collisions by accounting for the color transparency phenomenon within the frame of the GVDM (Generalized Vector meson Dominance Model). We evaluate also within the GVDM the inelastic ψ ′-nucleon cross section as well as the cross section for the nondiagonal transitions. Predictions for the ratio of J/ψ to ψ ′ yields in the near threshold ¯ p nucleus scattering for different nuclear targets are presented.