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Titolo:
MESON PROPERTIES IN AN EXTENDED NONLOCAL NJL MODEL
Autore:
PLANT RS; BIRSE MC;
Indirizzi:
UNIV MANCHESTER,DEPT PHYS & ASTRON,THEORET PHYS GRP MANCHESTER M13 9PL LANCS ENGLAND
Titolo Testata:
Nuclear physics. A
fascicolo: 4, volume: 628, anno: 1998,
pagine: 607 - 644
SICI:
0375-9474(1998)628:4<607:MPIAEN>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
JONA-LASINIO MODEL; PION FORM-FACTOR; DYSON-SCHWINGER-EQUATIONS; AXIAL-VECTOR MESONS; QUARK-MODEL; RESONANCE PHYSICS; CHIRAL LAGRANGIANS; SYMMETRY-BREAKING; NAMBU; QCD;
Keywords:
NAMBU-JONA-LASINIO MODEL; NONLOCAL INTERACTIONS; CHIRAL SYMMETRY; MESONS; FORM FACTORS; VECTOR-MESON DOMINANCE;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
115
Recensione:
Indirizzi per estratti:
Citazione:
R.S. Plant e M.C. Birse, "MESON PROPERTIES IN AN EXTENDED NONLOCAL NJL MODEL", Nuclear physics. A, 628(4), 1998, pp. 607-644

Abstract

We consider a non-local version of the NJL model, based on a separable quark-quark interaction. The interaction is extended to include terms that bind vector and axial-vector mesons. The nonlocality means thatno further regulator is required. Moreover the model is able to confine the quarks by generating a quark propagator without poles at real energies. Working in the ladder approximation, we calculate amplitudes in Euclidean space and discuss features of their continuation to Minkowski energies. Conserved currents are constructed and we demonstrate their consistency with various Ward identities. Various meson masses are calculated, along with their strong and electromagnetic decay amplitudes. We also calculate the electromagnetic form factor of the pion, as well as form factors associated with the processes gamma gamma --> pi(0) and omega --> pi(0) gamma. The results are found to lead to a satisfactory phenomenology and lend some dynamical support to the idea of vector-meson dominance. (C) 1998 Elsevier Science B.V.

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Documento generato il 22/09/20 alle ore 20:49:03