Study of the decays $\ddot{I}ˆ(3686)\to {\hat{I}}^3\ddot{I}{‡}_{cJ}\to {\hat{I}}^3\bar{p}{K}^{\ast +}\hat{I}›+c.c.$ and $\ddot{I}ˆ(3686)\to \bar{p}{K}^{\ast +}\hat{I}›+c.c.$

Abstract

Based on the data sample of $448.1\times 10^6$ $\ddot{I}ˆ(3686)$ events collected with the BESIII detector at BEPCII, we present a study of the decays $\ddot{I}ˆ(3686)\to {\hat{I}}^3\ddot{I}{‡}_{cJ}\to {\hat{I}}^3\bar{p}{K}^{\ast +}\hat{I}›+c.c.$ and $\ddot{I}ˆ(3686)\to \bar{p}{K}^{\ast +}\hat{I}›+c.c.$. The branching fractions of $\ddot{I}{‡}_{cJ}\to \bar{p}{K}^{\ast +}\hat{I}›+c.c.$ ($J$=0, 1, 2) are measured to be $(4.8\pm 0.7\pm 0.5)\times 10^{-4}$, $(5.0\pm 0.5\pm 0.4)\times 10^{-4}$, and $(8.2\pm 0.9\pm 0.7)\times 10^{-4}$, respectively, where the first uncertainties are statistical and the second systematic. The branching fraction of $\ddot{I}ˆ(3686)\to \bar{p}{K}^{\ast +}\hat{I}›+c.c.$ is measured to be $(6.3\pm 0.5\pm 0.5)\times 10^{-5}$. All these decay modes are observed for the first time.