First observation of the $\hat{I}{\cdot }_c\to \hat{I}{ž}^0\bar{\hat{I}}{ž}^0$ decay

BESIII Collaboration, M. Ablikim, M. N. Achasov +761

Using $(10087\pm 44)\times 10^6$ $J/\ddot{I}ˆ$ events collected with the BESIII detector at the BEPCII collider, we report the first observation of the decay $η_{c} \to Ξ^{0} \barΞ^{0}…