Charm production in antiproton–nucleus collisions at the J/ψ and the ψ′ thresholds (original) (raw)

We discuss the production of charmonium states in antiproton-nucleus collisions at the ψ ′ threshold. It is explained that measurements inpA collisions will allow to get new information about the strengths of the inelastic J/ψN and ψ ′ N interaction, on the production of Λc andD in charmonium-nucleon interactions and for the first time about the nondiagonal transitions ψ ′ N → J/ψN. The inelastic J/ψ-nucleon cross section is extracted from the comparison of hadronnucleus 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 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 antiproton-nucleus scatterings close to the threshold of ψ ′ production for different nuclear targets are presented.