Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-05-23
Phys.Rev. D68 (2003) 054009
Physics
High Energy Physics
High Energy Physics - Phenomenology
22 pages LaTex, 7 eps-figures, discussion of evolved gluon distribution revised significantly
Scientific paper
10.1103/PhysRevD.68.054009
We note that the phenomenon of perturbative saturation leads to transverse momentum broadening in the spectrum of partons produced in hadronic collisions. This broadening has a simple interpretation as parton level Cronin effect for systems in which saturation is generated by the "tree level" Glauber-Mueller mechanism. For systems where the broadening results form the nonlinear QCD evolution to high energy, the presence or absence of Cronin effect depends crucially on the quantitative behavior of the gluon distribution functions at transverse momenta kt outside the so called scaling window. We discuss the relation of this phenomenon to the recent analysis by Kharzeev-Levin-McLerran of the momentum and centrality dependence of particle production in nucleus-nucleus collisions at RHIC.
Baier Rudolf
Kovner Alexander
Wiedemann Urs Achim
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