Unitary Symmetry and the Stability ofΣHypernuclei

Abstract
In the limit of unbroken SU(3) symmetry, we exhibit a selection rule which forbids the decay of certain hypernuclear states involving a coherent admixture of Λ and Σ hyperons. This may provide an explanation of the narrow widths of some hypernuclear excitations observed in the Σ continuum.

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