Parton saturation and Npart scaling of semi-hard processes in QCD

被引:284
作者
Kharzeev, D [1 ]
Levin, E
McLerran, L
机构
[1] Brookhaven Natl Lab, Dept Phys, Nucl Theory Grp, Upton, NY 11973 USA
[2] Tel Aviv Univ, Raymond & Beverly Sackler Fac Exact Sci, Sch Phys, HEP Dept, IL-69978 Tel Aviv, Israel
[3] DESY, Theory Grp, D-22603 Hamburg, Germany
基金
以色列科学基金会;
关键词
D O I
10.1016/S0370-2693(03)00420-9
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We argue that the suppression of high p(t) hadrons discovered recently in heavy ion collisions at RHIC may be a consequence of saturation in the color glass condensate. We qualitatively and semi-quantitatively describe the data, in particular, the dependence upon the number of nucleon participants. We show that if parton saturation sets in at sufficiently small energy, then in nucleus-nucleus collisions at RHIC and LHC energies the cross sections of semi-hard processes should scale approximately with the number of participants, N-part. Our results provide a possible explanation of both the absence of apparent jet quenching at SPS energies and its presence at RHIC. Under the same assumption we predict that in semi-central and central p(A) (dA) collisions at collider energies the dependence of semi-hard processes on the number of participating nucleons of the nucleus will change to similar to(N-part(A))(1/2). The forthcoming data on dA collisions will provide a crucial test of this description. (C) 2003 Published by Elsevier Science B.V.
引用
收藏
页码:93 / 101
页数:9
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