e + A碰撞中胶子密度的测量：KLN，DGLAP Glauber，还是都不是？
Measuring the Gluon Density in e + A Collisions: KLN CGC, DGLAP Glauber, or Neither?
摘要：
我们预测了在eRHIC和LHeC能量下e + A碰撞中J/psi介子相干光生的衍射截面的实验可测量的差异，假设核胶子分布：1）在x方向上以DGWIN动力学演化，空间分布与Glauber核厚度函数成正比，2）根据CGC动力学的KLN处方在x和b方向上演化。我们发现，CGC物理预测，核胶子密度显着扩大作为x的函数产生衍射峰和最小值，与x显着演变;另一方面，DGWG-Glauber分布产生的峰值和最小值常数在x。我们还发现，在两个胶子交换的水平内的KLN参数化的CGC的偶极截面满足黑盘限制，而这个限制是违反时，使用DGstrom演化;衍射截面的归一化增长更慢的几个数量级的x时，使用KLN参数化相比，当采用DGstrom演化的结果。
英文摘要：
We predict readily experimentally measurable differences in the diffractive cross section in the coherent exclusive photoproduction of J/psi mesons in e + A collisions at eRHIC and LHeC energies for nuclear gluon distributions assumed to 1) evolve in x with DGLAP dynamics and have a spatial distribution proportional to the Glauber nuclear thickness function and 2) evolve in x and b according to the KLN prescription of CGC dynamics. We find that CGC physics predicts that the nuclear gluon density widens significantly as a function of x yielding diffractive peaks and minima that evolve dramatically with x; on the other hand the DGLAP Glauber distribution yields peaks and minima constant in x. We also find that the dipole cross section at the level of two gluon exchange within the KLN parameterization of the CGC satisfies the black disk limit whereas this limit is violated when DGLAP evolution is used; the normalization of the diffractive cross section grows more slowly in x by several orders of magnitude when using the KLN parameterization as compared to the result when employing DGLAP evolution.
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