Observation of $\psi (3686)\to \gamma \eta (1405)$ via $\eta (1405)\to f_0(980){\pi }^0$

M. Ablikim, M. N. Achasov, P. Adlarson +694

The decay $\psi (3686)\to \gamma {\pi }^{+}{\pi }^{-}{\pi }^0$ is studied using a sample of $(2712.4\pm 14.3)\times 10^6$ $\psi (3686)$ events collected with the BESIII detector. The decay $\eta (1405)\to {\pi }^{+}{\pi }^{-}{\pi }^0$ is ob…