Observation of the decays $\ddot{I}{‡}_{cJ}\to n{K}_S^0\bar{\hat{I}}›+c.c.$

Abstract

By analyzing $4.48\times 10^8$ $\ddot{I}ˆ(3686)$ events collected with the BESIII detector, we observe the decays $\ddot{I}{‡}_{cJ}\to n{K}_S^0\bar{\hat{I}}›+c.c.$ ($J=0$, 1, 2) for the first time, via the radiative transition $\ddot{I}ˆ(3686)\to {\hat{I}}^3\ddot{I}{‡}_{cJ}$. The branching fractions are determined to be $(6.67\pm 0.26_{\mathrm{stat}}\pm 0.41_{\mathrm{syst}})\times 10^{-4}$, $(1.71\pm 0.12_{\mathrm{stat}}\pm 0.12_{\mathrm{syst}})\times 10^{-4}$, and $(3.66\pm 0.17_{\mathrm{stat}}\pm 0.23_{\mathrm{syst}})\times 10^{-4}$ for $J=0$, 1, and 2, respectively.

10 pages, 4 figures