One-loop corrections to single spin asymmetries at twist-3 in Drell-Yan processes

One-loop corrections to single spin asymmetries at twist-3 in Drell-Yan processes
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对 Drell-Yan 过程中扭曲 3 处单自旋不对称性的单环修正

DOI:
10.1103/physrevd.95.074005
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发表时间:
2016-07
期刊:
影响因子:
5
通讯作者:
Zhang G. P.
Zhang G. P.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Chen A. P.;Ma J. P.;Zhang G. P.

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我们研究了Drell-Yan过程中的单圈精度的单自旋不对称性,其中一个初始强子是横向极化的。微分截面的自旋相关部分可以用twist-2和twist-3算符的各种强子矩阵元分解。这些算子可以是偶手性和奇手性。在这项工作中,所研究的非对称性的观测值是具有不同权重的微分截面。这些权重的选择,使观测量是自旋相关的,其虚拟的修正是完全由夸克的形状因子。在单圈修正的计算中,我们遇到了涉及手征奇和手征偶算子的贡献的共线发散。我们发现,所有的分歧可以正确地减去。因此,我们的结果给出了一个明确的例子,QCD因子分解与扭转-3算子,特别是QCD因子分解与手性奇扭转-3算子。
We study single spin asymmetries at one-loop accuracy in Drell-Yan processes in which one of the initial hadrons is transversely polarized. The spin-dependent part of differential cross-sections can be factorized with various hadronic matrix elements of twist-2 and twist-3 operators. These operators can be of even- and odd-chirality. In this work, the studied observables of asymmetries are differential cross-sections with different weights. These weights are selected so that the observables are spin-dependent and their virtual corrections are completely determined by quark form factor. In the calculations of one-loop corrections we meet collinear divergences in the contributions involving chirality-odd and chirality-even operators. We find that all of the divergences can be correctly subtracted. Therefore, our results give an explicit example of QCD factorization with twist-3 operators, especially, QCD factorization with chirality-odd twist-3 operators.
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