Observation of $\ddot{I}{‡}_{cJ}\to p\bar{p}{K}_S^0{K}^{-}\ddot{I}{€}^{+}+c.c.$

Abstract

By analyzing $(27.12\pm 0.14)\times 10^8$ $\ddot{I}ˆ(3686)$ events collected with the BESIII detector operating at the BEPCII collider, the decays of $\ddot{I}{‡}_{cJ}\to p\bar{p}{K}_S^0{K}^{-}\ddot{I}{€}^{+}+c.c.(J=0,1,2)$ 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 $\mathcal{B}(\ddot{I}{‡}_{c0}\to p\bar{p}{K}_S^0{K}^{-}\ddot{I}{€}^{+}+c.c.)=(2.61\pm 0.27\pm 0.32)\times 10^{-5},$ $\mathcal{B}(\ddot{I}{‡}_{c1}\to p\bar{p}{K}_S^0{K}^{-}\ddot{I}{€}^{+}+c.c.)=(4.16\pm 0.24\pm 0.46)\times 10^{-5},$ and $\mathcal{B}(\ddot{I}{‡}_{c2}\to p\bar{p}{K}_S^0{K}^{-}\ddot{I}{€}^{+}+c.c.)=(5.63\pm 0.28\pm 0.46)\times 10^{-5}$, respectively. The processes $\ddot{I}{‡}_{c1,2}\to \bar{p}\hat{I}›(1520)K_S^0\ddot{I}{€}^{+}+c.c.$ are also observed, with statistical significances of 5.7$\ddot{I}ƒ$ and 7.0$\ddot{I}ƒ$, respectively. Evidence for $\ddot{I}{‡}_{c0}\to \bar{p}\hat{I}›(1520)K_S^0\ddot{I}{€}^{+}+c.c.$ is found with statistical significances of 3.3$\ddot{I}ƒ$ each. The corresponding branching fractions are determined to be $\mathcal{B}(\ddot{I}{‡}_{c0}\to \bar{p}\hat{I}›(1520)K_S^0\ddot{I}{€}^{+}+c.c.)=(1.61_{-0.64}^{+0.68}\pm 0.23)\times 10^{-5}$, $\mathcal{B}(\ddot{I}{‡}_{c1}\to \bar{p}\hat{I}›(1520)K_S^0\ddot{I}{€}^{+}+c.c.)=(4.06_{-0.76}^{+0.80}\pm 0.52)\times 10^{-5}$, and $\mathcal{B}(\ddot{I}{‡}_{c2}\to \bar{p}\hat{I}›(1520)K_S^0\ddot{I}{€}^{+}+c.c.)=(4.09_{-0.84}^{+0.87}\pm 0.42)\times 10^{-5}$. Here, the first uncertainties are statistical and the second ones are systematic.

12 pages, 5 figures