Search for $\hat{I}{\cdot }_c(2S)\to \ddot{I}‰\ddot{I}‰$ and $\ddot{I}‰\ddot{I}•$ decays and measurements of $\ddot{I}{‡}_{cJ}\to \ddot{I}‰\ddot{I}‰$ and $\ddot{I}‰\ddot{I}•$ in $\ddot{I}ˆ(2S)$ radiative processes

BESIII Collaboration, M. Ablikim, M. N. Achasov +649

Using $(2712\pm 14)$ $\times$ 10${}^6$ $\ddot{I}ˆ(2S)$ events collected with the BESIII detector at the BEPCII collider, we search for the decays $\hat{I}{\cdot }_c(2S)\to \ddot{I}‰\ddot{I}‰$ and $η_{c}(2S)\toωυ