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arXiv 1608.05293hep-ph
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次领先级质子-核碰撞中前向粒子产生的CGC因子分解

CGC factorization for forward particle production in proton-nucleus collisions at next-to-leading order

E. Iancu, A. H. Mueller, D. N. Triantafyllopoulos

摘要:

在彩色玻璃凝聚有效理论的框架内,我们重新考虑了高能质子-核碰撞中正向快速单包容粒子产生的次领先级(NLO)计算.为了确定夸克产生,我们建立了一个新的因子分解方案,通过NLO微扰正确,其中没有“快度扣除”。也就是说,对影响因子的NLO校正没有明确地与高能演化分离。我们的构造利用了(NLO)Balitsky-Kovchegov方程的骨架结构,其中演化的第一步被明确挑出来。NLO影响因子是通过计算第一次发射的胶子的精确运动学,而不是通过使用程函近似。这种特殊的计算已经在文献[1,2]中提出,但我们提出的微扰理论的重组是新的。与文献[1,2]中的方案相比,我们的方案不需要快度减项中的微调,而快度减项可能是导致NLO截面为负的原因。

英文摘要:

Within the Color Glass Condensate effective theory, we reconsider the next-to-leading order (NLO) calculation of the single inclusive particle production at forward rapidities in proton-nucleus collisions at high energy. Focusing on quark production for definiteness, we establish a new factorization scheme, perturbatively correct through NLO, in which there is no `rapidity subtraction'. That is, the NLO correction to the impact factor is not explicitly separated from the high-energy evolution. Our construction exploits the skeleton structure of the (NLO) Balitsky-Kovchegov equation, in which the first step of the evolution is explicitly singled out. The NLO impact factor is included by computing this first emission with the exact kinematics for the emitted gluon, rather than by using the eikonal approximation. This particular calculation has already been presented in the literature [1,2], but the reorganization of the perturbation theory that we propose is new. As compared to the proposal in [1,2], our scheme is free of the fine-tuning inherent in the rapidity subtraction, which might be the origin of the negativity of the NLO cross-section observed in previous studies.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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