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arXiv 1004.3697hep-ph
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自旋自由度与横动量相关的部分子分布函数中的Wilson线

Wilson lines in transverse-momentum dependent parton distribution functions with spin degrees of freedom

I. O. Cherednikov, A. I. Karanikas, N. G. Stefanis

摘要:

我们提出了一个新的框架的横向动量相关的部分子分布函数,基于广义的规范不变性的概念,其中包括到威尔逊线的泡利项$\sim F^{μν}[γ_μ, γ_ν]$。我们讨论了非积分部分子分布函数,有关自旋粒子的非最小项的相关性,并分析其重整化群性质的影响。结果表明,虽然泡利长期保留的概率解释的扭曲两个分布-非极化和极化-它引起额外的极贡献的扭曲三。这种方式诱导的异常维度是一个矩阵,需要仔细分析演化效应。此外,事实证明,泡利项之间的串扰和纵向和横向部分的规范场,伴随着费米子,诱导一个恒定的,但依赖于过程,这是相同的领先和subleading分布函数的相位。我们包括费曼规则的计算与规范链接包含泡利项和评论的现象学意义,我们的方法。

英文摘要:

We propose a new framework for transverse-momentum dependent parton distribution functions, based on a generalized conception of gauge invariance which includes into the Wilson lines the Pauli term $\sim F^{μν}[γ_μ, γ_ν]$. We discuss the relevance of this nonminimal term for unintegrated parton distribution functions, pertaining to spinning particles, and analyze its influence on their renormalization-group properties. It is shown that while the Pauli term preserves the probabilistic interpretation of twist-two distributions---unpolarized and polarized---it gives rise to additional pole contributions to those of twist-three. The anomalous dimension induced this way is a matrix, calling for a careful analysis of evolution effects. Moreover, it turns out that the crosstalk between the Pauli term and the longitudinal and the transverse parts of the gauge fields, accompanying the fermions, induces a constant, but process-dependent, phase which is the same for leading and subleading distribution functions. We include Feynman rules for the calculation with gauge links containing the Pauli term and comment on the phenomenological implications of our approach.

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