On gauge invariant nucleon spin decomposition
arXiv:1110.6516 · doi:10.1140/epja/i2012-12091-8
Abstract
A non-uniqueness problem of gauge invariant separation of quark and gluon contributions to nucleon spin is considered. We show that there is a wide number of gauge invariant spin decompositions each of them reduces to the canonical one in a special gauge. A class of physical gauge equivalent nucleon spin decompositions is selected by requirements of consistence with helicity notion described within E(2) little group representation theory and with gluon helicity Δg measured in experiment.
5 pages, final version accepted by EPJA
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- Gauge symmetry and background independence: Should the proton spin decomposition be path independent?
- Gauge Invariant Descriptions of Gluon Polarizations
- Are there infinitely many decompositions of the nucleon spin ?
- Gauge Invariant Descriptions of Gluon Polarizations Revisited
- On the decomposition theorem for gluons
- The proton spin decomposition : path dependence and gauge symmetry
- Gauge invariant gluon spin operator for spinless non-linear wave solutions
- Reformulations of Yang-Mills Theories with Space-time Tensor Fields
- Gauge invariance, Lorentz covariance and canonical quantization in nucleon structure studies
- Physical Angular Momentum Separation for QED