K−−DAbsorption and aπ−ΣResonance

The branching ratios for the $K^{-}+d\to \pi +Y+N$ reactions are compared with those for the $K^{-}+p\to \pi +Y$ reactions. Certain of these deuteron branching ratios are shown to be independent of hyperon-nucleon final state interaction and are inconsistent with the proton branching ratios. The most likely explanation of the discrepancy is the presence of an isospin zero $\pi -\Sigma$ resonance a few Mev below the $K^{-}+p$ threshold. This resonance is consistent with the ($b-$) set of $K^{-}-p$ scattering lengths determined by Dalitz and Tuan.