Study of the processes $\ddot{I}{‡}_{cJ}\to \hat{I}{ž}^{-}\bar{\hat{I}}{ž}^{+}$ and $\hat{I}{ž}^0\bar{\hat{I}}{ž}^0$

Abstract

Using $448.1\times 10^6$ $\ddot{I}ˆ(3686)$ decays collected with the BESIII detector at the BEPCII $e^{+}{e}^{-}$ storage rings, the branching fractions and angular distributions of the decays $\ddot{I}{‡}_{cJ}\to \hat{I}{ž}^{-}\bar{\hat{I}}{ž}^{+}$ and $\hat{I}{ž}^0\bar{\hat{I}}{ž}^0$ $(J=0,1,2)$ are measured based on a partial-reconstruction technique. The decays $\ddot{I}{‡}_{c1}\to \hat{I}{ž}^0\bar{\hat{I}}{ž}^0$ and $\ddot{I}{‡}_{c2}\to \hat{I}{ž}^0\bar{\hat{I}}{ž}^0$ are observed for the first time with statistical significances of 7$\ddot{I}ƒ$ and 15$\ddot{I}ƒ$, respectively. The results of this analysis are in good agreement with previous measurements and have significantly improved precision.

10 pages, 3 figures, 4 tables, consistent with the publication in JHEP06(2022)074