论文标题
QCD中NLO+NNLL的SIVERS功能的全局分析
Global analysis of the Sivers functions at NLO+NNLL in QCD
论文作者
论文摘要
我们在QCD中的横向动量依赖性（TMD）分解形式上表现全局拟合。我们同时拟合来自Compass，Hermes和Jlab的半包含深度弹性散射（SIDIS）的Sesivers不对称数据，来自Compass的Drell-Yan Lepton对生产，以及RHIC的$ W/Z $ BOSON。此提取是在近代领先顺序（NLO）和临时到达领先对数（NNLL）精度下进行的。我们发现我们提取的不对称性与SIDIS和DRELL-YAN LEPTON对生产的实验数据之间存在极好的一致性，而在尝试描述Rhic的$ W/z $玻色子的旋转不对称时会产生张力。我们仔细评估了情况，并通过不同的拟合方式详细研究了RHIC数据及其含义的影响。此外，除了通常的TMD演化外，我们发现$ W/z $ vector Boson不对称数据的描述质量可能对Qiu-Sterman函数的DGLAP演变非常敏感。我们对此进行了讨论，以及对未来电子离子对撞机横向自旋不对称的测量的影响。
We perform global fit to the quark Sivers function within the transverse momentum dependent (TMD) factorization formalism in QCD. We simultaneously fit Sivers asymmetry data from Semi-Inclusive Deep Inelastic Scattering (SIDIS) at COMPASS, HERMES, and JLab, from Drell-Yan lepton pair production at COMPASS, and from $W/Z$ boson at RHIC. This extraction is performed at next-to-leading order (NLO) and next-to-next-to leading logarithmic (NNLL) accuracy. We find excellent agreement between our extracted asymmetry and the experimental data for SIDIS and Drell-Yan lepton pair production, while tension arises when trying to describe the spin asymmetries of $W/Z$ bosons at RHIC. We carefully assess the situation, and we study in details the impact of the RHIC data and their implications through different ways of performing the fit. In addition, we find that the quality of the description of $W/Z$ vector boson asymmetry data could be strongly sensitive to the DGLAP evolution of Qiu-Sterman function, besides the usual TMD evolution. We present discussion on this and the implications for measurements of the transverse-spin asymmetries at the future Electron Ion Collider.
