Measurements of the branching fractions of $\ddot{I}{‡}_{cJ}\to 2K^{+}2K^{-}\ddot{I}‰$ and $\ddot{I}•K^{+}{K}^{-}\ddot{I}‰$ decays

BESIII Collaboration, M. Ablikim, M. N. Achasov +688

Using a data sample of $(2712.4\pm 14.3)\times 10^6$ $\ddot{I}ˆ(3686)$ events collected with the BESIII detector operating at the BEPCII collider, we report the first observation of t…