Search for the electromagnetic Dalitz decays $\ddot{I}{‡}_{cJ}\to e^{+}{e}^{-}\ddot{I}•$

BESIII Collaboration, M. Ablikim, M. N. Achasov +689

Using a data sample of $(2.712\pm 0.014)\times 10^9$ $\ddot{I}ˆ(3686)$ events collected at $\sqrt{s}=3.686$ GeV by the BESIII detector, we search for the rare electromagnetic Dalitz dec…