Spin and orbital angular momentum in gauge theories:: Nucleon spin structure and multipole radiation revisited

被引：164

作者：

Chen, Xiang-Song ^{[1
,2
]}

Lue, Xiao-Fu ^{[1
]}

Sun, Wei-Min ^{[2
]}

Wang, Fan ^{[2
]}

Goldman, T. ^{[3
]}

机构：

[1] Sichuan Univ, Dept Phys, Chengdu 610064, Peoples R China

[2] Nanjing Univ, Dept Phys, Nanjing 210093, Peoples R China

[3] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 23期

关键词：

D O I：

10.1103/PhysRevLett.100.232002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We address and solve the long-standing gauge-invariance problem of the nucleon spin structure. Explicitly gauge-invariant spin and orbital angular momentum operators of quarks and gluons are obtained. This was previously thought to be an impossible task and opens a more promising avenue towards the understanding of the nucleon spin. Our research also justifies the traditional use of the canonical, gauge-dependent angular momentum operators of photons and electrons in the multipole-radiation analysis and labeling of atomic states and sheds much light on the related energy-momentum problem in gauge theories, especially in connection with the nucleon momentum.

引用

页数：4

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