Effective meson-exchange potentials in theSU6quark model forNNandYNinteractions

We investigate characteristic properties of effective meson-exchange potentials to achieve a simultaneous description of the nucleon-nucleon (NN) and hyperon-nucleon (YN) interactions in the (3q)-(3q) resonating-group formulation of the spin-flavor ${\mathrm{SU}}_6$ quark model. The quark Hamiltonian includes a phenomenological confinement potential of ${\mathit{r}}^2$ type, the full Fermi-Breit interaction with explicit quark-mass dependence, and the central, spin-spin, and tensor components of the meson-exchange potentials generated from the scalar and pseudoscalar meson nonet exchanges. A small number of parameters are determined to fit the S- and P-wave NN phase shifts and the low-energy cross-section data for YN scattering. Satisfactory agreement with experiment is obtained, including the NN phase shifts up to J=4 partial waves, the deuteron properties, the effective-range parameters, and the total and differential cross sections of the ΛN and ΣN systems. In the intermediate-energy region with ${\mathit{p}}_{\mathrm{lab}}$≥ 400–500 MeV/c, some discrepancies from the one-boson exchange potentials, such as the Nijmegen and Jülich models, are found for the YN scattering observables. In particular, the total nuclear cross sections of ${\mathrm{\Sigma }}^{+}$p elastic scattering show a smooth decreasing behavior in this energy region. In Λp elastic total cross sections, the cusp structure appearing at the ΣN threshold through the one-pion tensor force is influenced by the antisymmetric ${\mathit{LS}}^{\left(\mathrm{-}\right)}$ force generated from the Fermi-Breit interaction. © 1996 The American Physical Society.