Thermal versus direct J/Ψ production in ultrarelativistic heavy-ion collisions

被引：169

作者：

Grandchamp, L ^{[1
]}

Rapp, R

机构：

[1] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA

[2] Inst Phys Nucl, IN2P3, CNRS, F-69622 Villeurbanne, France

[3] UCBL, F-69622 Villeurbanne, France

来源：

PHYSICS LETTERS B | 2001年 / 523卷 / 1-2期

关键词：

D O I：

10.1016/S0370-2693(01)01311-9

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The production of J/psi mesons in central collisions of heavy nuclei is investigated as a function of collision energy. Two contributions are considered simultaneously: early (hard) production coupled with subsequent suppression in a quark-gluon plasma. as well as thermal recombination of primordially produced c and (c) over bar quarks at the hadronization transition. Whereas the former still constitutes the major fraction of the observed J/psi abundance at SpS energies, the latter dominates the yield at RHIC. The resulting excitation function for the number of J/psi 's over open charm pairs exhibits nontrivial structure around roots similar or equal to 30 A GeV, evolving into a significant rise towards maximal RHIC energy. We study this feature within different (thermal) scenarios for J/psi suppression, including parton-induced quasifree destruction as a novel mechanism. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：60 / 66

页数：7

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