Energy dependence of the Cronin effect from nonlinear QCD evolution

被引：178

作者：

Albacete, JL ^{[1
]}

Armesto, N

Kovner, A

Salgado, CA

Wiedemann, UA

机构：

[1] Univ Cordoba, Dept Fis, E-14071 Cordoba, Spain

[2] CERN, Div Theory, CH-1211 Geneva 23, Switzerland

[3] Univ Plymouth, Dept Math & Stat, Plymouth PL4 8AA, Devon, England

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 92卷 / 08期

关键词：

D O I：

10.1103/PhysRevLett.92.082001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The nonlinear evolution of dense partonic systems has been suggested as a novel physics mechanism relevant for the dynamics of p-A and A-A collisions at collider energies. Here we study to what extent the description of Cronin enhancement in the framework of this nonlinear evolution is consistent with the recent observation in roots=200 GeV d-Au collisions at the Relativistic Heavy Ion Collider. We solve the Balitsky-Kovchegov evolution equation numerically for several initial conditions encoding Cronin enhancement. We find that the properly normalized nuclear gluon distribution is suppressed at all momenta relative to that of a single nucleon. For the resulting spectrum of produced gluons in p-A and A-A collisions, the nonlinear QCD evolution is unable to generate a Cronin-type enhancement, and it quickly erases any such enhancement which may be present at lower energies.

引用

页数：4

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