规范场结构与基本粒子角动量性质研究

本项目将首先研究自由粒子的内禀轨道角动量性质，以及内禀轨道角动量对应的横向动量等问题。进而我们将探讨粒子的内禀轨道角动量，外部轨道角动量和自旋之间的区别与联系。在此基础上，我们将考察携带内禀轨道角动量的粒子在外场中的行为，特别是在原子系统中可能的新物理现象。进一步通过对非阿贝尔规范场结构的分析并结合上述工作，我们将研究夸克和胶子的自旋和轨道角动量算符，使之与半经典图像中的相应算符具有相同的物理含义。这些研究有望为核子自旋研究提供新的思路，同时为我国计划开展的核子结构实验研究提供理论预研。

In this project we will study the intrinsic orbit angular momentum (OAM) and corresponding nontrivial transverse momentum of free particles firstly. Then, we will investigate the relation between intrinsic OAM, extrinsic OAM and spin. Next step, the dynamics of particles carrying the intrinsic OAM in the external field will be considered. And the possible novel phenomena induced by the intrinsic OAM in the atomic system will be explored. Furthermore, a new definition of spin and OAM of quark and gluons based on the inner structure of gauge field will be studied, which should have the same meanings as their semi-classical counterpart. We expect that above research may shed a light on the nucleon spin problem, also provide the theoretical study for the future experiments on nucleon structure.