The SU(6) value for the axial-vector coupling constant of the nucleon, which is 5/3, is modified by considering the relativistic motion of the quarks inside the hadron. The covariant harmonic-oscillator formalism of Kim and Noz is used to describe the internal quark motion. An excellent numerical result is obtained with reasonable choices for spring constant and quark mass.
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Michael J. Ruiz (1975) studied this question.
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