Spin and orbital angular momentum in gauge theories (II): QCD and nucleon spin structure

2007/09/09 by X. S. Chen, Xiang-Song Chen, Xiao-Fu Lü +6 · 2 citations
Physics and Astronomy · #hep-ph

paper · pdf · doi:10.1103/physrevlett.100.232002

published as Phys.Rev.Lett.100:232002,2008 · 3 pages, no figure; presented by F. Wang at NSTAR2007

arxiv created 2007/09/09 · arxiv updated 2015/06/30

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.

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• Zero curvature is a necessary and sufficient condition for a spin-orbital decomposition
• Geometrizing the Anomaly

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• Spin and orbital angular momentum in gauge theories (I): QED and determination of the angular momentum density
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• Orbital and field angular momentum in the nucleon
• The application of gauge invariance and canonical quantization to the internal structure of gauge field systems
• GPDs and underlying spin structure of the nucleon