论文标题
单个横向自旋不对称和Siver在大动量有效理论中起作用
Single Transverse-Spin Asymmetry and Sivers Function in Large Momentum Effective Theory
论文作者
论文摘要
我们将最新动量有效理论（LAMET）的最新发展用于根据所谓的Sesivers机制的准横向momentum依赖性夸克依赖性夸克依赖性夸克分布函数来制定单trans旋转旋转不对称的非扰动计算。当旋转不对称定义为夸克·西弗（Quark Sivers）功能与自旋平均分布的比率时，可以直接根据相关的准函数和软函数和取消扰动匹配的内核来直接计算。除了提出的一般公式外，我们还以一环阶的小横向距离限制验证了结果，该横向距离的距离降低了扭曲三级的沿线扩张。
We apply recent developments in large momentum effective theory (LaMET) to formulate a non-perturbative calculation of the single-transverse spin asymmetry in terms of the quasi transverse-momentum-dependent quark distribution functions from the so-called Sivers mechanism. When the spin asymmetry is defined as the ratio of the quark Sivers function over the spin averaged distribution, it can be directly calculated in terms of the relevant quasi distributions with the soft functions and perturbative matching kernels cancelling out. Apart from the general formula presented, we have verified the result in the small transverse distance limit at one-loop order, which reduces to a collinear expansion at twist-three level.
