1/N(C) ROTATIONAL CORRECTIONS TO GA AND ISOVECTOR MAGNETIC-MOMENT OF THE NUCLEON

The 1/N(c) rotational corrections to the axial vector constant and the isovector magnetic moment of the nucleon are studied in the Nambu-Jona-Lasinio model. We follow a semiclassical quantization procedure in terms of path integrals in which we can include perturbatively corrections in powers of angular velocity OMEGA approximately 1/N(c). We find non-zero 1/N(c) order corrections from both the valence and the Dirac sea quarks. These corrections are large enough to resolve the long-standing problem of a strong underestimation of both g(A) and mu(IV) in the leading order. For the constituent quark mass of about 400 MeV the axial constant g(A) is well reproduced, whereas the isovector magnetic moment mu(IV) is still underestimated by 25 %.