Decay Modesη→π+π−π0γandη→π0γγ

Abstract

We calculate rates and photon-energy spectra for the decay modes $\eta \to {\pi }^{+}{\pi }^{-}{\pi }^0\gamma$ and $\eta \to {\pi }^0\gamma \gamma$, with the aid of a new model. The relevance of the decay mode $\eta \to {\pi }^{+}{\pi }^{-}{\pi }^0\gamma$ to the possibility of $C$ violation in electromagnetic interactions is discussed.