Baryon spectra and non-strange baryon strong decays in the chiral SU(3) quark model

摘要

In the framework chiral SU(3) quark model, the baryon spectra within the bandof $N\leq 2$ are studied, and the effect of the confining potential indifferent configurations, namely the $\Delta$-mode and Y-mode are compared. Inthe same way, the baryon spectra in the extended chiral SU(3) quark model, inwhich additional vector meson exchanges are introduced, are also calculated. Itis shown that a reasonable baryon spectrum in the chiral SU(3) quark model canbe achieved no matter whether the $\Delta$-mode or the Y-mode confiningpotential is employed. In the extended chiral SU(3) quark model, several energylevels are further improved. The resultant binding energies of excited baryonstates in different confining modes deviate just by a few to several tens MeV,and it is hard to justify which confining mode is the dominant one. Thenon-strange baryon strong decay widths are further discussed in the point-likemeson emission model by using the wave-function obtained in the spectrumcalculation. The resultant widths can generally explain the experimental databut still cannot distinguish which confining mode is more important in thissimple decay mode.