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Ju l 1 99 8 J / Ψ suppressions in a thermally equilibrating quark-gluon plasma at RHIC

We estimate the survival probability of J/ψ in relativistic heavy-ion collisions , using both short-distance QCD and nuclear absorption mechanism. The suppression is found to be almost 100 percent for a thermally equili-brating quark-gluon plasma. The measurement of such a huge suppression of J/ψ may suggest the existence of a deconfined partonic medium, possibly a thermalised quark-gluon plasma, at RHIC.