Nuclear absorption and J/ suppression in Pb+Pb collisions
Abstract
We have analyzed the NA58 data on J/ suppression in Pb+Pb collisions. J/ production is assumed to be a two step process, (i) formation of cc pair, which is accurately calculable in QCD and (ii) formation of J/ meson from the cc pair, which can be conveniently parameterized. In a pA/AA collision, a cc pair gain relative square momentum as it passes through the nuclear medium and some of the cc pairs can gain enough momentum to cross the threshold to become an open charm meson, leading to suppression in pA/AA collisions. A new prescription is proposed for the gain in momentum square, consistent with Krammer process. The model without any free parameter could explain the ET dependence of J/ over Drell-Yan ratio.
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