arXiv 1611.044492016-11hep-ph

Drell-Yan结构函数的扭曲分解：唯象意义

Twist decomposition of Drell-Yan structure functions: phenomenological implications

Dawid Brzeminski, Leszek Motyka, Mariusz Sadzikowski, Tomasz Stebel

备注：: 23 pages, 9 figures
发表信息：: JHEP01(2017)005
DOI：: 10.1007/JHEP01(2017)005

摘要：

本文研究了LHC上$\sqrt{S}=14$ TeV的$pp$散射的前向Drell-Yan过程。我们分析了Drell-Yan结构函数，假设快夸克散射小$x$胶子时虚光子的类康普顿发射占主导地位。应用色偶极框架对所有Drell-Yan结构函数进行了定量的扭曲分解。应用两种模型的颜色偶极子散射：Golec-Biernat-Wüsthoff模型和偶极子截面从Balitsky-Fadin-Kuraev-Lipatov演化方程得到。这两个模型具有本质上不同的高扭含量和胶子横向动量分布，并导致了超出共线主导扭描述的不同显着效应。结果表明，对于所有Drell-Yan对质量$M$，Drell-Yan结构函数中的胶子横动量效应都是显著的，而对于$M \lesssim 10$ GeV，更高的扭曲效应变得很重要.发现与$A_2$角系数相关的结构函数$W_{TT}$和Lam-Tung观测值$A_0 -A_2$对胶子$k_T$效应和高扭曲效应特别敏感.提出了一种从胶子横动量效应中分离高扭效应的方法。

英文摘要：

The forward Drell--Yan process in $pp$ scattering at the LHC at $\sqrt{S}=14$ TeV is considered. We analyze the Drell--Yan structure functions assuming the dominance of a Compton-like emission of a virtual photon from a fast quark scattering off the small $x$ gluons. The color dipole framework is applied to perform quantitatively the twist decomposition of all the Drell--Yan structure functions. Two models of the color dipole scattering are applied: the Golec-Biernat--Wüsthoff model and the dipole cross section obtained from the Balitsky--Fadin--Kuraev--Lipatov evolution equation. The two models have essentially different higher twist content and the gluon transverse momentum distribution and lead to different significant effects beyond the collinear leading twist description. It is found that the gluon transverse momentum effects are significant in the Drell--Yan structure functions for all Drell--Yan pair masses $M$, and the higher twist effects become important for $M \lesssim 10$ GeV. It is found that the structure function $W_{TT}$ related to the $A_2$ angular coefficient and the Lam--Tung observable $A_0 -A_2$ are particularly sensitive to the gluon $k_T$ effects and to the higher twist effects. A procedure is suggested how to disentangle the higher twist effects from the gluon transverse momentum effects.

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