Measurement of $\Gamma (\eta \to {\pi }^{+}{\pi }^{-}\gamma )/\Gamma (\eta \to {\pi }^{+}{\pi }^{-}{\pi }^0)$ with KLOE experiment

The KLOE Collaboration, F. Ambrosino, A. Antonelli +87

We report the measurement of the ratio $\Gamma (\eta \to {\pi }^{+}{\pi }^{-}\gamma )/\Gamma (\eta \to {\pi }^{+}{\pi }^{-}{\pi }^0)$ analyzing a large sample of $\varphi \to \eta \gamma$ decays recorded with the KLOE experiment at the DA$\Phi$NE $e^{+}{e}^{-}$ c…