Quark-Model Baryon-Baryon Interaction and Its Applications to Hypernuclei

The quark-model baryon-baryon interaction fss2, proposed by the Kyoto-Niigatagroup, is a unified model for the complete baryon octet (B_8=N, Lambda, Sigmaand Xi), which is formulated in a framework of the (3q)-(3q) resonating-groupmethod (RGM) using the spin-flavor SU_6 quark-model wave functions andeffective meson-exchange potentials at the quark level. Model parameters aredetermined to reproduce properties of the nucleon-nucleon system and thelow-energy cross section data for the hyperon-nucleon scattering. Due to theseveral improvements including the introduction of vector-meson exchangepotentials, fss2 has achieved very accurate description of the NN and YNinteractions, comparable to various one-boson exchange potentials. We reviewthe essential features of fss2 and our previous model FSS, and theirpredictions to few-body systems in confrontation with the availableexperimental data. Some characteristic features of the B_8 B_8 interactionswith the higher strangeness, S=-2, -3, -4, predicted by fss2 are discussed.These quark-model interactions are now applied to realistic calculations offew-body systems in a new three-cluster Faddeev formalism which usestwo-cluster RGM kernels. As for the few-body systems, we discuss thethree-nucleon bound states, the Lambda NN-Sigma NN system for the hypertriton,the alpha alpha Lambda system for 9Be Lambda, and the Lambda Lambda alphasystem for 6He Lambda Lambda.Comment: 20 pages, 12 figures, 18th Nishinomiya Yukawa Memorial Symposium on Strangeness in Nuclear Matter, 4 - 5 December 2003, Nishinomiya, Japan. (to be published in Prog. Theor. Phys. Suppl.