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arXiv 0807.1605hep-ph
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质子-核和核-核碰撞的正向物理

Forward Physics in Proton-Nucleus and Nucleus-Nucleus Collisions

J. Nemchik, I. K. Potashnikova

摘要:

我们提出了一个普遍的治疗实质性的核抑制核目标上的所有已知的反应的共同特征(向前生产高pT强子,直接光子的生产,Drell-Yan过程,重味生产等)。在大费曼xF(对应于原子核中最小光锥动量分数变量x2的区域)处的这种抑制很容易被解释为相干性或彩色玻璃凝聚的表现。然而,我们证明,它实际上是一个简单的结果,能量守恒,甚至在低能量,没有相干性的影响是可能的。我们分析了这种常见的抑制机制进行模型预测的几个过程中的光锥偶极子的方法。我们的计算与数据相符.

英文摘要:

We present an universal treatment for a substantial nuclear suppression representing a common feature of all known reactions on nuclear targets (forward production of high-pT hadrons, production of direct photons, the Drell-Yan process, heavy flavor production, etc.). Such a suppression at large Feynman xF, corresponding to region of minimal light-cone momentum fraction variable x2 in nuclei, is tempting to interpret as a manifestation of coherence or the Color Glass Condensate. We demonstrate, however, that it is actually a simple consequence of energy conservation and takes place even at low energies, where no effects of coherence are possible. We analyze this common suppression mechanism for several processes performing model predictions in the light-cone dipole approach. Our calculations agree with data.

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