Axial Anomaly and the Nucleon Spin
Abstract
In this letter, we have taken a particular Lagrangian, which was introduced to resolve U(1) problem, as an effective QCD Lagrangian, and have derived a formula of the quark content of the nucleon spin. The difference between quark content of the proton (\Delta\Sigma_p) and that of the neutron (\Delta\Sigma_n) is evaluated by this formula. Neglecting the higher-order isospin corrections, this formula can reduce to Efremov's results in the large N_c limit.
Keywords
Cite
@article{arxiv.hep-ph/9510332,
title = {Axial Anomaly and the Nucleon Spin},
author = {C. S. Kim and J. H. Lin},
journal= {arXiv preprint arXiv:hep-ph/9510332},
year = {2009}
}
Comments
(1) A few changes and corrections made following Referee. (2) The difference between quark content of the proton (\Delta\Sigma_p) and that of the neutron (\Delta\Sigma_n) is evaluated. Neglecting the higher-order isospin corrections, this formula can reduce to Efremov's results in the large N_c limit