Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1995-01-24
Nucl.Phys.A590:703-734,1995
Physics
Nuclear Physics
Nuclear Theory
Plain TeX, 27 pages. (revised version with minor corrections).
Scientific paper
10.1016/0375-9474(95)00198-A
We consider the extended SU(3) Nambu and Jona-Lasinio model with explicit vector couplings in the presence of external fields. We study the chiral anomaly in this model and its implications on the properties of the nucleon described as a chiral soliton of three valence quarks bounded in mesonic background fields. For the model to reproduce the QCD anomaly it is necessary to subtract suitable local and polynomial counterterms in the external and dynamical vector and axial-vector fields. We compute the counterterms explicitly in a vector gauge invariant regularization, and obtain modifications to the total effective action and vector and axial currents. We study the numerical influence of those counterterms in the two flavour version of model with dynamical $\sigma,\pi, \rho, A $ and $\omega$ mesons. We find that, for time independent hedgehog configurations, the numerical effects in the nucleon mass, the isoscalar nucleon radius and the axial coupling constant are negligibly small.
Arriola Enrique Ruiz
Salcedo L. L.
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