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 is consistent with the net-proton rapidity distribution reported by BRAHMS.
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机译：我们认为，在RHIC的重离子碰撞的中心速度区域观察到的重子停止量与小x处的核价夸克分布成比例。通过推广用于描述Reggeons的Mueller偶极子模型，我们为超小对数近似中的小x处的价夸克分布构造了一个非线性演化方程。该方程式中包括胶子饱和度的影响。演化方程的解给出了价夸克分布函数$ dn_ {val} / dy \ sim e ^ {-（0.4 \ div0.5）y} $。我们表明，这种y依赖性与BRAHMS报告的净质子速度分布是一致的。
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