Scalar Mesons in a Chiral Quark Model with Glueball

Details Scalar Mesons in a Chiral Quark Model with Glueball Scalar Mesons in a Chiral Quark Model with Glueball

2000-07-13

arxiv.org/abs/hep-ph/0007131v1

Eur.Phys.J. A8 (2000) 567-576

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, LaTeX text, requires svjour.cls and svepj.clo

Scientific paper

10.1007/s100500070079

Ground-state scalar isoscalar mesons and a scalar glueball are described in a U(3)xU(3) chiral quark model of the Nambu--Jona-Lasinio (NJL) type with 't Hooft interaction. The latter interaction produces singlet-octet mixing in the scalar and pseudoscalar sectors. The glueball is introduced into the effective meson Lagrangian as a dilaton on the base of scale invariance. The mixing of the glueball with scalar isoscalar quarkonia and amplitudes of their decays into two pseudoscalar mesons are shown to be proportional to current quark masses, vanishing in the chiral limit. Mass spectra of the scalar mesons and the glueball and their main modes of strong decay are described.

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