Study of the processes ?cJ ? ??$$ \overline{\Xi} $$ + and ?0 $$ \overline{\Xi} $$0

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