Nambu-Jona-Lasinio Models Beyond the Mean Field Approximation

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dc.creatorDomitrovich, P.
dc.creatorBückers, D.
dc.creatorMüther, H.
dc.date1993-04-01
dc.date.accessioned2026-07-07T11:14:59Z
dc.date.available2026-07-07T11:14:59Z
dc.descriptionInspired by the model of Nambu and Jona-Lasinio, various Lagrangians are considered for a system of interacting quarks. Employing standard techniques of many-body theory, the scalar part of the quark self-energy is calculated including terms up to second-order in the interaction. Results obtained for the single-particle Green's function are compared with those which only account for the mean-field or Hartree-Fock term in the self-energy. Depending on the explicit form of the Lagrangian, the second-order contributions range between 4 and 90 percent of the leading Hartree-Fock term. This leads to a considerable momentum dependence of the self-energy and the effective mass of the quarks.
dc.description17 pages
dc.identifierhttps://arxiv.org/abs/nucl-th/9304001
dc.identifierhttp://arxiv.org/abs/nucl-th/9304001
dc.identifierPhys.Rev.C48:413-422,1993
dc.identifierdoi:10.1103/PhysRevC.48.413
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/192262
dc.subjectNuclear Theory
dc.titleNambu-Jona-Lasinio Models Beyond the Mean Field Approximation
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