We calculate the quark spin contribution to the total angular momentum of flavor octet and flavor decuplet ground state baryons using a spin-flavor symmetry based parametrization method of quantum chromodynamics. We find that third order SU(6) symmetry breaking three-quark operators are necessary to explain the experimental result Sigma_1=0.32(10). For spin 3/2 decuplet baryons we predict that the quark spin contribution is Sigma_3=3.93(22), i.e. considerably larger than their total angular momentum.
@article{arxiv.1011.0139,
title = {Spin of ground state baryons},
author = {A. J. Buchmann and E. M. Henley},
journal= {arXiv preprint arXiv:1011.0139},
year = {2013}
}