Observation of $\ddot{I}{‡}_{cJ}\to 3K_S^0{K}^{\pm }\ddot{I}{€}^{\mp }$

Abstract

By analyzing $(2712.4\pm 14.3)\times 10^6$ $\ddot{I}ˆ(3686)$ events collected with the BESIII detector operating at the BEPCII collider, the decays $\ddot{I}{‡}_{c0,1,2}\to 3K_S^0{K}^{\pm }\ddot{I}{€}^{\mp }$ are observed for the first time with statistical significances greater than $10\ddot{I}ƒ$. The branching fractions of these decays are determined to be $\mathcal{B}(\ddot{I}{‡}_{c0}\to 3K_S^0{K}^{\pm }\ddot{I}{€}^{\mp })=(7.95\pm 0.50\pm 0.65)\times 10^{-5},$ $\mathcal{B}(\ddot{I}{‡}_{c1}\to 3K_S^0{K}^{\pm }\ddot{I}{€}^{\mp })=(2.62\pm 0.08\pm 0.19)\times 10^{-4},$ and $\mathcal{B}(\ddot{I}{‡}_{c2}\to 3K_S^0{K}^{\pm }\ddot{I}{€}^{\mp })=(1.72\pm 0.07\pm 0.15)\times 10^{-4},$ where the first uncertainties are statistical and the second systematic.

11 pages, 6 figures