Single transverse-spin asymmetry in Drell-Yan production at large and moderate transverse momentum
Single transverse-spin asymmetry in Drell-Yan production at large and moderate transverse momentum
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DOI：
10.1103/physrevd.73.094017
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发表时间：
2006-04
影响因子：
5
通讯作者：
X. Ji;J. Qiu;W. Vogelsang;F. Yuan
中科院分区：
文献类型：
--
作者：
X. Ji;J. Qiu;W. Vogelsang;F. Yuan
我们研究了Drell-Yan过程的单横自旋不对称性。我们考虑轻子对在大横动量q{subvertical}{approx}Q下的产生，其中Q是轻子对的质量。自旋不对称性则具有更高的扭曲度，可能是由扭曲度为3的夸克-胶子关联函数产生的。当q{subvertical}<<Q时，我们将结果展开，得到了包含Sivers函数的与横动量相关的QCD因子分解。我们发现夸克胶子关联和Sivers效应这两种机制在这一区域具有相同的物理性质。这将两者联系在一起，并对单横自旋不对称性的唯象研究施加了重要的约束。
We study the single-transverse-spin asymmetry for the Drell-Yan process. We consider production of the lepton pair at large transverse momentum, q{sub perpendicular}{approx}Q, where Q is the pair's mass. The spin asymmetry is then of higher twist and may be generated by twist-three quark-gluon correlation functions. Expanding the result for q{sub perpendicular}<<Q, we make contact with the transverse-momentum-dependent QCD factorization involving the so-called Sivers functions. We find that the two mechanisms, quark-gluon correlations on one hand and the Sivers effect on the other, contain the same physics in this region. This ties the two together and imposes an important constraint on phenomenological studies of single-transverse-spin asymmetries.