Decay Rates of Neutral Mesons

We re-examine the model of Gell-Mann, Sharp, and Wagner for relating the $\omega \to {\pi }^{+}+{\pi }^{-}+{\pi }^0$ decay rate to the ${\pi }^0$ lifetime. It is shown that, if present experimental results, finding large structure effects in the ${\pi }^0$ decay form factor, are confirmed by more precise data, then Gell-Mann et al. have considerably under-estimated the $\omega \to 3\pi$ decay rate. The branching ratio, $\frac{\Gamma (\rho \to \pi +\gamma )}{\Gamma (\rho \to 2\pi )}$ is also greatly enhanced, becoming a percent or more.