Asymmetries associated with higher twists: gauge invariance, gluonic poles and twist three
Asymmetries associated with higher twists: gauge invariance, gluonic poles and twist three
复制标题
DOI：
--
复制
发表时间：
2012-01
期刊：
影响因子：
--
通讯作者：
I. Anikin;O. Teryaev
中科院分区：
文献类型：
--
作者：
I. Anikin;O. Teryaev
研究了具有一个横向极化强子的Drell-yan过程的强子张量的电磁规范不变性。由于等值规在胶子场中的特殊作用，TWIST 3相关器中胶子极点的规定可以与唯一硬过程的因果规定相联系。正因为如此，我们发现了额外的贡献，这些贡献天真地没有想象中的阶段。相应地，Drell-yan过程的单自旋不对称性增加了2倍。
We explore the electromagnetic gauge invariance of the hadron tensor of the Drell-Yan process with one transversely polarized hadron. Due to the special role of the contour gauge for gluon fields, the prescription for the gluonic pole in the twist 3 correlator can be related to the causality prescriptions for exclusive hard processes. Because of this, we find the extra contributions, which naively do not have an imaginary phase. The single spin asymmetry for the Drell-Yan process is accordingly enhanced by the factor of two.