Static properties of light baryons in different large-N limits

Abstract

We investigate some static properties of light baryon ground states in three inequivalent large-N limits (with respect to the quark color representation): 't Hooft, QCD antisymmetric and QCD symmetric. Our framework is a constituent quark model with relativistic-type kinetic energy, stringlike confinement and one-gluon-exchange term, thus leading to well-defined results even for massless quarks. Moreover, two spin-dependent potentials are considered and treated as perturbations: the color magnetic interaction stemming from the one-gluon exchange process and the chiral (or Goldstone) boson exchange interaction. Our results confirm previous ones obtained by using either diagrammatic methods or constituent approaches for heavy quarks.Xth Quark Confinement and the Hadron Spectrum,