Observation of $\ddot{I}ˆ(3686)\to {\hat{I}}^3\hat{I}\cdot (1405)$ via $\hat{I}\cdot (1405)\to f_0(980)\ddot{I}{€}^0$

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

The decay $\ddot{I}ˆ(3686)\to {\hat{I}}^3\ddot{I}{€}^{+}\ddot{I}{€}^{-}\ddot{I}{€}^0$ is studied using a sample of $(2712.4\pm 14.3)\times 10^6$ $\ddot{I}ˆ(3686)$ events collected with the BESIII detector. The decay $η(1405)\toπ^+π^-Ï…