Abstract
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 1 2 and 3 2 . Transverse momentum and x F distributions of prompt J/ ψ produced in 800 GeV/ c p–Be collisions are calculated by using NRQCD dσ/d t ̂ 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 χ cJ give rise to remarkable differences of J/ ψ, ψ′ and χ c suppressions at large negative x F in p–W collisions at s NN =38.8 and 41.6 GeV and p–Au collisions at s NN =130 GeV .
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