Nuclear absorption and J/ψ suppression in Pb plus Pb collisions -: art. no. 021902

被引：0
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作者：
Chaudhuri, AK [1 ]
机构：
[1] Technion Israel Inst Technol, Dept Phys, IL-32000 Haifa, Israel
[2] Bhabha Atom Res Ctr, Ctr Variable Energy Cyclotron, Kolkata 700064, W Bengal, India
来源：
PHYSICAL REVIEW C | 2002年 / 66卷 / 02期
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中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
We have analyzed the NA58 data on J/psi suppression in Pb+Pb collisions. J/psi production is assumed to be a two step process, (i) formation of c (c) over bar pair, which is accurately calculable in QCD and (ii) formation of J/psi meson from the c (c) over bar pair, which can be conveniently parametrized. In a pA/AA collision, a c (c) over bar pair gains relative square momentum as it passes through the nuclear medium and some of the c (c) over bar 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 could explain the E-T dependence of J/psi over Drell-Yan ratio.
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