Can the $Σ^- nn$ System be Bound?

Abstract

Motivated by the $Σ$-hypernuclear states reported in ($K^-,π^{\pm}$) experiments, we have explored the possibility that there exists a particle-stable $Σ^- nn$ bound state. For the Jülich à hyperon-nucleon, realistic-force model, our calculations yield little reason to expect a positive-parity bound state in either the $J = \frac{1}{2}$ or the $J = \frac{3}{2}$ channels.