Central Force of Baryon-Baryon Interactions with S=-2 in the SU_6 Quark Model : Nuclear Physics

概要

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We investigate the strangeness S=-2 central interaction between two octet baryons using a unified formulation of the (3q)-(3q) resonating-group method in the SU_6 quark model. The full Fermi-Breit qq interaction with explicit flavor symmetry breaking is supplemented by the effective meson-exchange potentials generated from the scalar-meson nonet and π and K mesons of the Nijmegen potential model-F. The central forces predicted by the quark-model potential have flavor-dependent medium-range attraction in the S=-2 system just as in the S=-1 system. The strength of the ΞN-ΛΛ transition potential in the ^1S channel strongly depends on the effect of the flavor symmetry breaking generated by the mass difference between ud and s quarks. The binding energy of the H-particle and Ξ^-p total cross sections at p_Ξ=500 MeV/c are estimated in the simplest model RGM-F. The binding energy is 19 MeV in the full three-channel calculation, and σ_<el>(Ξ^-p)=28 mb, σ(Ξ^-p⇾Ξ^0n)=24 mb and σ(Ξ^-p⇾ΛΛ)=15 mb in the two-channel calculation.
1997-05-25