Hyperon-nucleon and hyperon-hyperon interaction in the quark cluster model

The non-relativistic quark cluster model is used to describe the hyperon-nucleon (ΛN,ΣN) and hyperon-hyperon (H-dibaryon) interaction. The potentials comprise the one gluon exchange and a pseudoscalar meson exchange between quarks plus an additional phenomenological σ-meson exchange. The strength of the σ-meson is the only fit parameter of the model. Fitting this parameter to one cross section, the ΛN and ΣN cross sections agree well with the experimental data. The H-dibaryon is then calculated without any change of parameters. It is found to exhibit a bound state with a binding energy of (- 20 ± 5) MeV below the ΛΛ threshold, i.e., the mass of the H-dibaryon is predicted to be (2211 ± 5 MeV)