强子结构和量子色动力学因子化的研究

申请的项目主要将对量子色动力学中的因子化问题以及利用因子化的结果去探索强子内部结构开展理论研究。我们拟对单自旋不对称性的量子修正或twist-3共线因子化中高阶效应开展研究工作。首先，我们将对半单举深度非弹性散射过程和Drell-Yan过程中twist-3 效应的单圈修正开展计算，期待通过具体计算去验证twist-3因子化以及的更精确的物理预言。我们也将对一些过程中涉及胶子的依赖横向动量因子化的论证工作，为实验上利用这些过程探索强子内部胶子的运动提供理论依据。在某些特殊动力学区域，共线因子化和依赖横向动量因子化同时适用。我们将试图研究在此特殊动力学区域两种因子化，特别是涉及到胶子作为部分子的两种因子化之间的等价关系。

The project of the application will focus on the study of factorizations of quantum chromodynamics and how to explore the inner structure of hadrons by using factorizations. We plan to study higher order corrections in collinear factorization involving twist-3 operators. In the first step, we will calculate the one-loop corrections of twist-3 effects in Semi Inclusive DIS and Drell-Yan processes, with the expectation to verify the factorization by explicit calculations and to obtain more accurate predictions. We will also perform studies to give arguments or proofs for transverse-momentum-dependent factorizations of certain processes suggested for extracting transverse-momentum-dependent gluon distribution functions. In some special kinematic regions, both of the collinear- and transverse-momentum-dependent factorization applies. We will make attempt to study the equivalence between the two factorizations where gluons as partons are involved.