Spin and orbital angular momentum in gauge theories (II): QCD and nucleon spin structure
X.S. Chen, X.F. L\"u, W.M. Sun, F. Wang, and T. Goldman
TL;DR
This paper constructs explicit gauge-invariant spin and orbital angular momentum operators for quarks and gluons in QCD, advancing the understanding of the nucleon spin structure.
Contribution
It provides the first explicit gauge-invariant operators for quark and gluon angular momentum in QCD, extending previous work on QED.
Findings
Explicit gauge-invariant operators for QCD spin and orbital angular momentum.
Demonstrates the feasibility of defining gauge-invariant angular momentum in QCD.
Opens new pathways for studying nucleon spin structure.
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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Taxonomy
TopicsPulsars and Gravitational Waves Research · Geophysics and Sensor Technology · Quantum and Classical Electrodynamics