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arXiv · 1111.3717

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

J. P. Ma·H. Z. Sang·S. J. Zhu
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Abstract

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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J. P. Ma, H. Z. Sang, S. J. Zhu. 2012-05-03. Collinear Factorization for Single Transverse-Spin Asymmetry in Drell-Yan Processes. https://doi.org/10.1103/physrevd.85.114011

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