dorsal/arxiv
View SchemaChiral anomaly and nucleon properties in the Nambu--Jona-Lasinio model with vector mesons
| Authors | E. Ruiz Arriola, L. L. Salcedo |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9501026 |
| URL | https://arxiv.org/abs/nucl-th/9501026 |
| DOI | 10.1016/0375-9474(95)00198-A |
| Journal | Nucl.Phys.A590:703-734,1995 |
Abstract
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.
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"abstract": "We consider the extended SU(3) Nambu and Jona-Lasinio model with explicit\nvector couplings in the presence of external fields. We study the chiral\nanomaly in this model and its implications on the properties of the nucleon\ndescribed as a chiral soliton of three valence quarks bounded in mesonic\nbackground fields. For the model to reproduce the QCD anomaly it is necessary\nto subtract suitable local and polynomial counterterms in the external and\ndynamical vector and axial-vector fields. We compute the counterterms\nexplicitly in a vector gauge invariant regularization, and obtain modifications\nto the total effective action and vector and axial currents. We study the\nnumerical influence of those counterterms in the two flavour version of model\nwith dynamical $\\sigma,\\pi, \\rho, A $ and $\\omega$ mesons. We find that, for\ntime independent hedgehog configurations, the numerical effects in the nucleon\nmass, the isoscalar nucleon radius and the axial coupling constant are\nnegligibly small.",
"arxiv_id": "nucl-th/9501026",
"authors": [
"E. Ruiz Arriola",
"L. L. Salcedo"
],
"categories": [
"nucl-th"
],
"doi": "10.1016/0375-9474(95)00198-A",
"journal_ref": "Nucl.Phys.A590:703-734,1995",
"title": "Chiral anomaly and nucleon properties in the Nambu--Jona-Lasinio model with vector mesons",
"url": "https://arxiv.org/abs/nucl-th/9501026"
},
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