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arXiv 0706.2117hep-ph
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扭转3软胶子极机制对单横自旋非对称性的新主公式

Novel Master Formula for Twist-3 Soft-Gluon-Pole Mechanism to Single Transverse-Spin Asymmetry

Yuji Koike, Kazuhiro Tanaka

摘要:

我们证明了在首阶微扰QCD中,单自旋不对称的扭3软胶子极(SGP)截面取决于运动学和色因子的某个"本原“扭2截面。这揭示了在各种硬过程中SGP截面背后的普遍结构,以及标度不变性在相应的原始截面中的特殊作用,从而导致了无质量粒子产生的SGP截面的显著简化,例如π介子产生p^ \uparrow p \to πX和直接光子产生p^ \uparrow p \to γX的SGP截面。

英文摘要:

We prove that twist-3 soft-gluon-pole (SGP) cross section for single spin asymmetries is determined by a certain ``primordial'' twist-2 cross section up to kinematic and color factors in the leading order perturbative QCD. This unveils universal structure behind the SGP cross sections in a variety of hard processes, and also the special role of the scale invariance in the corresponding primordial cross section, which leads to remarkable simplification of the SGP cross sections for the production of massless particle, such as those for pion production p^\uparrow p \to πX and direct-photon production p^\uparrow p \to γX.

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