Baryon-baryon scattering in a one-boson-exchange-potential approach. II. Hyperon-nucleon scattering

Abstract

From a combined analysis of nucleon-nucleon and hyperon-nucleon scattering with a one-boson-exchange potential model the $\ensuremath{\Lambda}N$ and $\ensuremath{\Sigma}N$ results are presented. The model consists of local potentials due to exchanges of members of the pseudoscalar and vector-meson nonets and the scalar meson $\ensuremath{\epsilon}$ taken as a unitary singlet. The multichannel Schr\"odinger equation is solved in configuration space with phenomenological hard-core potentials at short distances. The coupling constants are calculated via SU(3) with the coupling constants of the $\mathrm{NN}$ analysis as input. Charge-symmetry breaking between the $\ensuremath{\Lambda}p$ and $\ensuremath{\Lambda}n$ channels is included. A least-squares fit to the low-energy $\ensuremath{\Lambda}p$, ${\ensuremath{\Sigma}}^{+}p$, and ${\ensuremath{\Sigma}}^{\ensuremath{-}}p$ data yields a very satisfactory result. Predictions up to the pion production threshold are given, and, whenever possible, compared to the experimental data.