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arXiv 1111.3717hep-ph
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Drell-Yan过程中单横自旋不对称性的共线分解

Collinear Factorization for Single Transverse-Spin Asymmetry in Drell-Yan Processes

J. P. Ma, H. Z. Sang, S. J. Zhu

摘要:

研究了单部分子态与多部分子态的散射,得到了初态为横极化强子的Drell-Yan过程中单横自旋不对称性(SSA)共线分解中首阶微扰系数函数的完整结果.我们发现SSA的因子分解公式包含了硬极、软夸克极和软胶子极的贡献。有趣的是,软夸克极和软胶子极贡献的首阶微扰系数函数是从单圈部分子散射振幅中提取的,而硬极贡献的首阶微扰系数函数是从树能级部分子散射振幅中提取的.我们的方法来获得SSA的因式分解是不同于现有的文献中。并将所得结果与其它方法所得结果作了比较。

英文摘要:

We study the scattering of a single parton state with a multi-parton state to derive the complete results of perturbative coefficient functions at leading order, which appear in the collinear factorization for Single transverse-Spin Asymmetry(SSA) in Drell-Yan processes with a transversely polarized hadron in the initial state. We find that the factorization formula of SSA contains hard-pole-, soft-quark-pole- and soft-gluon-pole contributions. It is interesting to note that the leading order perturbative coefficient functions of soft-quark-pole- and soft-gluon-pole contributions are extracted from parton scattering amplitudes at one-loop, while the functions of hard-pole contributions are extracted from the tree level amplitudes at tree-level. Our method to derive the factorization of SSA is different than the existing one in literature. A comparison of our results with those obtained by other method is made.

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