Ground states and excitation spectra of baryons in a non-Coulombic power-law potential model - art. no. 014011

Under the assumption that baryons are an assembly of independent quarks, co nfined in a first approximation by an effective non-Coulombic power-law pot ential which presumably represents the nonperturbative multigluon interacti ons including gluon self-coupling, the ground state and the excitation spec tra of the light and strange baryons are studied, taking into account the c ontribution of the quark-gluon coupling perturbatively due to one-gluon exc hange along with that of the quark-pion coupling arising out of the require ment of chiral symmetry in one model and that of the Goldstone boson (pi, e ta, and k) exchange interaction arising from spontaneous breaking of chiral symmetry in a second model. Both of these models, which (i) include an app reciable contribution from the color-magnetic interaction and (ii) treat th e meson degree of freedom perturbatively in a manner as is done in the clou dy bag model, are capable of describing the ground state mass spectrum of o ctet baryons in close agreement with experiment but fail to provide the sim ultaneous description of both ground states and radial excitations, especia lly the correct ordering of the positive- and negative-parity excitations i n the N, Delta, and Lambda spectra.