Abstract
The object of this study is a system containing a baryon with the properties of the $\ensuremath{\Lambda}\ensuremath{-}\ensuremath{\Sigma}$ quartet, in strong interaction with mesons which may be bound to form various isobar states. The model involves two independent coupling constants $g$ and ${g}^{\ensuremath{'}}$. It will be shown that the case $g={g}^{\ensuremath{'}}$ which corresponds to doublet (or global) symmetry is singular in that it is strongly affected by a certain quantum-mechanical resonance.
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