Axial Anomaly and the Nucleon Spin
C. S. Kim, J. H. Lin
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 (p) and that of the neutron (n) is evaluated by this formula. Neglecting the higher-order isospin corrections, this formula can reduce to Efremov's results in the large Nc limit.
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