Charmonium dissociation cross sections and p–A collisions Original Research Article

Charmonium dissociations by nucleons are first studied from a quark–quark potential in combination with quark exchange mechanism. Wave functions of nucleons and charmed baryons involved in dissociation reactions result from a fit to mass splittings of baryons with spins View the MathML source and View the MathML source. Transverse momentum and xF distributions of prompt J/ψ produced in 800 GeV/cp–Be collisions are calculated by using NRQCD View the MathML source for parton–parton scatterings and taking into account initial transverse-momentum distributions of partons inside nucleons. We emphasize that the new dissociation cross sections of J/ψ, ψ′ and χcJ give rise to remarkable differences of J/ψ, ψ′ and χc suppressions at large negative xF in p–W collisions at View the MathML source and 41.6 GeV and p–Au collisions at View the MathML source.