Two-Component Approach to J/Ψ Production in High-Energy Heavy-Ion Collisions

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The production of charmonia in ultrarelativistic heavy-ion collisions is investigated including two sources. These are a primordial contribution coupled with various phases of dissociation, and a statistical coalescence of c and c quarks at the hadronization phase transition. Within a schematic fireball evolution, SPS data on J/Ψ production can be reasonably well reproduced. Remaining discrepancies in the Ψ'/Ψ ratio are discussed. Predictions for the J/Ψ centrality dependence at RHIC energies are confronted with first data from PHENIX. The pertinent excitation function of the Nⱼ/Ψ/Ncc ratio exhibits a characteristic minimum structure signaling the transition from the standard J/Ψ suppression scenario (SPS) to predominantly statistical production (RHIC).