Observation of the decays $\ddot{I}{‡}_{cJ}\to \hat{I}{\pounds }^0\bar{p}{K}^{+}+c.c.(J=0,1,2)$

Abstract

The decays $\ddot{I}{‡}_{cJ}\to \hat{I}{\pounds }^0\bar{p}{K}^{+}+c.c.(J=0,1,2)$ are studied via the radiative transition $\ddot{I}ˆ(3686)\to {\hat{I}}^3\ddot{I}{‡}_{cJ}$ based on a data sample of $(448.1\pm 2.9)\times 10^6$ $\ddot{I}ˆ(3686)$ events collected with the BESIII detector. The branching fractions of $\ddot{I}{‡}_{cJ}\to \hat{I}{\pounds }^0\bar{p}{K}^{+}+c.c.(J=0,1,2)$ are measured to be $(3.03\pm 0.12\pm 0.15)\times 10^{-4}$, $(1.46\pm 0.07\pm 0.07)\times 10^{-4}$, and $(0.91\pm 0.06\pm 0.05)\times 10^{-4}$, respectively, where the first uncertainties are statistical and the second are systematic. In addition, no evident structure is found for excited baryon resonances on the two-body subsystems with the limited statistics.

9 pages, 16 figures