arXiv:0709.1284·v1·High Energy Physics — Phenomenology
Spin and orbital angular momentum in gauge theories (II): QCD and nucleon spin structure
X.S. Chen🇨🇳 · X.F. Lü🇨🇳 · W.M. Sun🇨🇳 · F. Wang🇨🇳 · T. Goldman🇺🇸
Abstract
Parallel to the construction of gauge invariant spin and orbital angular momentum for QED in paper (I) of this series, we present here an analogous but non-trivial solution for QCD. 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 structure.
Comments: 3 pages, no figure; presented by F. Wang at NSTAR2007