TRANSVERSE MOMENTUM-WEIGHTED SIVERS ASYMMETRY IN SEMI-INCLUSIVE DEEP INELASTIC SCATTERING AT NEXT-TO-LEADING ORDER
TRANSVERSE MOMENTUM-WEIGHTED SIVERS ASYMMETRY IN SEMI-INCLUSIVE DEEP INELASTIC SCATTERING AT NEXT-TO-LEADING ORDER
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DOI：
10.1103/physrevd.87.034024
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发表时间：
2012-12
期刊：
影响因子：
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通讯作者：
Z. Kang;I. Vitev;H. Xing
中科院分区：
文献类型：
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作者：
Z. Kang;I. Vitev;H. Xing
我们总结了最近一项对轻子-质子深非弹性散射中半包容强子产生中横向动量加权 Sivers 不对称性的次领先阶微扰 QCD 校正的研究结果。相应的微分截面被评估为扭曲三夸克胶子相关函数的卷积，通常称为 Qiu-Sterman 函数、通常的非偏振碎片函数和硬系数函数。通过研究共线散度结构，我们确定了 Qiu-Sterman 函数的演化核。硬系数函数是有限且没有任何散度的，以单循环顺序求值。
We summarize the results of a recent study of next-to-leading order perturbative QCD corrections to the transverse momentum-weighted Sivers asymmetry in semi-inclusive hadron production in lepton-proton deep inelastic scattering. The corresponding differential cross section is evaluated as a convolution of a twist-three quark-gluon correlation function, often referred to as Qiu-Sterman function, the usual unpolarized fragmentation function, and a hard coefficient function. By studying the collinear divergence structure, we identify the evolution kernel for the Qiu-Sterman function. The hard coefficient function, which is finite and free of any divergence, is evaluated at one-loop order.