Dependence of the S=-2 baryon-baryon interactions on the Effective Meson=Exchange Potentials in a Quark Model (ハイペロンの混合とストレンジネス多体系)

概要

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We investigate the dependence of the H-particle mass on the effective meson-exchange potentials by adopting the recent SU_6 quark model developed for a unified description of the NN and YN interactions. The results are sensitive to the magnitude of the attraction of the ΞN interaction and the strength of the ΛΛ-ΞN channel coupling. The H-particle may be bound when the ΛΛ-ΞN coupling effect is strong, which depends on the strength of the strange-meson exchange potentials and the flavor-symmetry breaking generated from the mass difference between ud and s quarks. We also estimate the Ξ^-p cross sections and find that the present three quark models predict the Ξ^-p → ΛΛ cross section of about 12 mb at p_Ξ=500 MeV/c.
2000-08-20