论文标题
通过通用力矩参数化的广义Parton分布：零偏度案例
Generalized parton distributions through universal moment parameterization: zero skewness case
论文作者
论文摘要
我们为基于共形力矩扩展提供了一项全球分析计划（GPD）。我们应用了通用矩参数化的策略，以符合现象学和晶格计算中普遍的形式因素的共线parton分布函数（PDF），并表明参数化足够灵活以适应这些约束。此外，我们还可以符合大型摩氏有效理论的GPD的直接晶格计算。在这项工作中，我们着重于$ t $依赖性PDF的分析，该分析与$ξ\至0 $限制中的GPD相对应。该策略还适用于带有额外参数的$ξ\ not = 0 $区域，因此将来可以适用于实验性观察物。以拟合GPD的示例示例，我们展示了质子的夸克横向动量密度，以及在非极化和横向极化质子中夸克的冲击参数空间分布。
We present a global analysis program for the generalized parton distributions (GPDs) based on conformal moment expansion. We apply the strategy of universal moment parameterization to fit both the collinear parton distribution functions (PDFs) from phenomenology and generalized form factors from lattice calculations, and show that the parameterization is flexible enough to accommodate these constraints. In addition, we can also fit direct lattice calculations of GPDs from large-momentum effective theory. In this work we focus on the analysis of $t$-dependent PDFs which correspond to GPDs in the $ξ\to 0$ limit. The strategy also applies to the $ξ\not =0$ region with extra parameters, and therefore can be fitted to experimental observables in the future. With a demonstrative example of fitted GPDs, we exhibit the quark transverse angular momentum densities of the proton as well as the impact parameter space distributions of quarks in both unpolarized and transversely polarized protons.
