Hard- and soft-fermion-pole contributions to single transverse-spin asymmetry for Drell-Yan process
Hard- and soft-fermion-pole contributions to single transverse-spin asymmetry for Drell-Yan process
复制标题
DOI：
10.1016/j.physletb.2011.06.021
复制
发表时间：
2011-05
影响因子：
4.4
通讯作者：
K. Kanazawa;Y. Koike
中科院分区：
文献类型：
--
作者：
K. Kanazawa;Y. Koike
本文研究了基于twist-3机制的Drell-Yan轻子对产生的单横自旋非对称性。本文计算了横极化核子中夸克胶子关联函数对单自旋相关截面的所有硬极和软费米子贡献。结合软胶子极（SGP）的贡献，这就完成了相应的扭曲-3截面。在真实的光子极限下，当所有的HP贡献都转化为SFP贡献时，我们发现SFP部分子硬截面对于两个独立的夸克胶子关联函数在每个散射通道中是一致的，就像在包含轻强子产生的情况下一样.我们的结果使人们能够从RHIC和J-PARC等设施即将进行的实验中提取夸克-胶子关联函数。
We study the single transverse-spin asymmetry for the Drell–Yan lepton pair production based on the twist-3 mechanism in the collinear factorization. We calculate all the hard-pole (HP) and the soft-fermion-pole (SFP) contributions to the single-spin-dependent cross section originating from the quark–gluon correlation functions in the transversely polarized nucleon in the leading order with respect to the QCD coupling constant. Combined with the soft-gluon-pole (SGP) contribution, this completes the corresponding twist-3 cross section. In the real photon limit, where all the HP contributions are transformed into the SFP contribution, we find that the SFP partonic hard cross section for the two independent quark–gluon correlation functions coincides in each scattering channel, as in the case of the inclusive light-hadron production. Our result enables one to extract the quark–gluon correlation functions from the forthcoming experiments at several facilities such as RHIC and J-PARC.