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

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

2008-06-19

arxiv.org/abs/0806.3166v1

Phys.Rev.Lett.100:232002,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, no figure

Scientific paper

10.1103/PhysRevLett.100.232002

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.

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