Interactions between octet baryons in the ${\mathrm{SU}}_6$ quark model

Baryon-baryon interactions for the complete baryon octet ${(B}_8)$ are investigated in a unified framework of the resonating-group method, in which the spin-flavor ${\mathrm{SU}}_6$ quark-model wave functions are employed. Model parameters are determined to reproduce properties of the nucleon-nucleon system and the low-energy cross section data for the hyperon-nucleon interaction. We then proceed to explore $B_8{B}_8$ interactions in the strangeness $S=-2,$ $-3,$ and $-4$ sectors. The S-wave phase-shift behavior and total cross sections are systematically understood by (1) the spin-flavor ${\mathrm{SU}}_6$ symmetry, (2) the special role of the pion exchange, and (3) the flavor symmetry breaking.