Baryon Stopping and the Valence Quark Distribution at Small x

Details Baryon Stopping and the Valence Quark Distribution at Small x Baryon Stopping and the Valence Quark Distribution at Small x

2003-05-30

arxiv.org/abs/hep-ph/0305332v3

Nucl.Phys.A730:160-190,2004

Physics

High Energy Physics

High Energy Physics - Phenomenology

25 pages, 10 figures, Sects.II and VI are improved. Many references added, typos corrected, Fig.4 replaced, etc

Scientific paper

10.1016/j.nuclphysa.2003.10.016

We argue that the amount of baryon stopping observed in the central rapidity region of heavy ion collisions at RHIC is proportional to the nuclear valence quark distributions at small x. By generalizing Mueller's dipole model to describe Reggeons we construct a non-linear evolution equation for the valence quark distributions at small x in the leading double-logarithmic approximation. The equation includes the effects of gluon saturation in it. The solution of the evolution equation gives a valence quark distribution function $dn_{val}/dy \sim e^{-(0.4\div0.5) y}$. We show that this y-dependence as well as the predictions of Regge theory are consistent with the net-proton rapidity distribution reported by BRAHMS.

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