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 (ΔΣp) and that of the neutron (∆Σn) 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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