Spin and orbital angular momentum in gauge theories (II): QCD and nucleon spin structure
arXiv:0709.1284 · doi:10.1103/PhysRevLett.100.232002
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.
3 pages, no figure; presented by F. Wang at NSTAR2007