QCD corrections of all structure functions in transverse momentum dependent factorization for Drell-Yan processes

QCD corrections of all structure functions in transverse momentum dependent factorization for Drell-Yan processes
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Drell-Yan 过程横向动量相关分解中所有结构函数的 QCD 校正

DOI:
10.1007/jhep02(2014)100
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发表时间:
2013-08
期刊:
The Journal of High Energy Physics
影响因子:
--
通讯作者:
Zhang, G. P.
Zhang, G. P.
中科院分区:
其他
文献类型:
--
作者:
Ma, J. P.;Zhang, G. P.

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摘要:我们研究了轻子对小横向动量下 Drell-Yan 过程的横向动量相关(TMD)分解的单环校正。我们采用所谓的减法方法,可以系统地构建贡献来减去由图表表示的远距离效应。相减后得到扰动部分。我们发现 TMD 分解中所有结构函数在前导扭曲处的微扰系数是相同的。微扰部分也可以通过部分子而不是强子的散射来研究。这样,许多结构函数的因式分解只能通过研究多部分子态的散射来检验,其中有很多图。这些图与减法方法中处理的图没有相似之处。作为一个例子,我们使用负责单自旋不对称的结构函数的现有结果来表明,多部分子态散射中的这些图与使用 Ward 恒等式后在减法方法中处理的图等效。
A bstractWe study the one-loop correction in Transverse-Momentum-Dependent(TMD) factorization for Drell-Yan processes at small transverse momentum of the lepton pair. We adopt the so-called subtractive approach, in which one can systematically construct contributions for subtracting long-distance effects represented by diagrams. The perturbative parts are obtained after the subtraction. We find that the perturbative coefficients of all structure functions in TMD factorization at leading twist are the same. The perturbative parts can also be studied with scattering of partons instead of hadrons. In this way, the factorization of many structure functions can only be examined by studying the scattering of multi-parton states, where there are many diagrams. These diagrams have no similarities to those treated in the subtractive approach. As an example, we use existing results of one structure function responsible for Single-Spin-Asymmetry, to show that these diagrams in the scattering of multi-parton states are equivalent to those treated in the subtractive approach after using Ward identity.
帕顿能级单横向自旋不对称
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