On gauge invariant nucleon spin decomposition
High Energy Physics - Phenomenology
2012-06-22 v3 High Energy Physics - Theory
Nuclear Theory
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 \Delta g measured in experiment.
Keywords
Cite
@article{arxiv.1110.6516,
title = {On gauge invariant nucleon spin decomposition},
author = {P. M. Zhang and D. G. Pak},
journal= {arXiv preprint arXiv:1110.6516},
year = {2012}
}
Comments
5 pages, final version accepted by EPJA