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arXiv 1105.4804hep-phhep-thnucl-th
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用于树级横向动量相关关联函数的规范链

Gauge links for transverse momentum dependent correlators at tree-level

M. G. A. Buffing, P. J. Mulders

摘要:

本文讨论了在描述高能散射过程中的软强子物理的强子矩阵元中引入规范链的问题。在这种描述中,矩阵元出现在软关联函数中,它们包含夸克和胶子场的非定域组合。在我们的描述中,我们超越了共线的方法,在这种情况下,也考虑到部分子的横动量的依赖。在横向方向上的非局域性导致了一个复杂的规范链接结构的整个过程中,颜色纠缠,即使在树级。我们表明,在树水平的1-部分子未积分(1 PU)的情况下,其中只有一个初始状态强子的横向动量是相关的,人们可以得到一个因子化的表达式,涉及横向动量相关(TMD)的分布函数。我们指出的问题,在两个初始状态强子的水平,即使是相对简单的过程,如Drell-Yan散射。

英文摘要:

In this paper we discuss the incorporation of gauge links in hadronic matrix elements that describe the soft hadronic physics in high energy scattering processes. In this description the matrix elements appear in soft correlators and they contain non-local combinations of quark and gluon fields. In our description we go beyond the collinear approach in which case also the dependence on transverse momenta of partons is taken into consideration. The non-locality in the transverse direction leads to a complex gauge link structure for the full process, in which color is entangled, even at tree-level. We show that at tree-level in a 1-parton unintegrated (1PU) situation, in which only the transverse momentum of one of the initial state hadrons is relevant, one can get a factorized expression involving transverse momentum dependent (TMD) distribution functions. We point out problems at the level of two initial state hadrons, even for relatively simple processes such as Drell-Yan scattering.

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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