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The dispersion method was applied to the problem of neutral-pion decay. lt is shown that a pion-pion P-wave resonance can produce a large effect in the decay matrix element. The contribution is related to the semifundamental constant which determines the rate of photoproduction of pions from pions. The contribution of a strong threepion state is considered. (auth)

Effects of the Pion-Pion Resonance and the Three-Pion Resonance or Bound State on Neutral-Pion Decay