Collinear factorization for single transverse-spin asymmetry in Drell-Yan processes

Collinear factorization for single transverse-spin asymmetry in Drell-Yan processes
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Drell-Yan 过程中单横向自旋不对称性的共线分解

DOI:
10.1103/physrevd.85.114011
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发表时间:
2011-11
期刊:
Physical Review D (particles, Fields, Gravitation and Cosmology)
影响因子:
--
通讯作者:
S. T. Zhu
S. T. Zhu
中科院分区:
其他
文献类型:
--
作者:
J. P. Ma;H. Z. Sang;S. T. Zhu

文献摘要

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我们研究单部分子态与多部分子态的散射,以导出前导阶微扰系数函数的完整结果,这些结果出现在初始态具有横向极化强子的 Drell-Yan 过程中单横向自旋不对称性 (SSA) 的共线分解中。我们发现SSA的分解公式包含硬极点、软夸克极点和软胶子极点的贡献。有趣的是,软夸克极和软胶子极贡献的前阶微扰系数函数是从单环的部分子散射振幅中提取的,而硬极贡献的函数是从树级的树级振幅中提取的。我们推导出 SSA 因式分解的方法与文献中现有的方法不同。这里将我们的结果与其他方法获得的结果进行比较。
We study the scattering of a single parton state with a multiparton 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 methods is made here.
帕顿能级单横向自旋不对称
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发表时间: 2009-01
影响因子: 3.1
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影响因子: --
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