First observation of $\eta (1405)$ decays into $f_0(980){\pi }^0$

BESIII Collaboration, M. Ablikim, M. N. Achasov +332

The decays $J/\psi \to \gamma {\pi }^{+}{\pi }^{-}{\pi }^0$ and $J/\psi \to \gamma {\pi }^0{\pi }^0{\pi }^0$ are analyzed using a sample of 225 million $\jpsi$ events collected with the BESIII detector. The decay of $η…