eta -> pi^+ pi^- pi^0 gamma in Chiral Perturbation Theory

G. D'Ambrosio, G. Ecker, G. Isidori +1

We analyse the radiative decay $\eta \to {\pi }^{+}{\pi }^{-}{\pi }^0\gamma$ in the low--energy expansion of the Standard Model. We employ the notion of ``generalized bremsstrahlung'' to take full advantage…