Observation of the $X(2370)$ in $J/\ddot{I}ˆ\to {\hat{I}}^3{K}_S^0{K}_S^0\ddot{I}{€}^0$ and $J/\ddot{I}ˆ\to {\hat{I}}^3\ddot{I}{€}^0\ddot{I}{€}^0\hat{I}\cdot$

BESIII Collaboration, M. Ablikim, M. N. Achasov +767

Based on $(10087\pm 44)\times 10^6$ $J/\ddot{I}ˆ$ events collected with the BESIII detector, the $J/\ddot{I}ˆ\to {\hat{I}}^3{K}_S^0{K}_S^0\ddot{I}{€}^0$ and $J/\ddot{I}ˆ\to {\hat{I}}^3\ddot{I}{€}^0\ddot{I}{€}^0\hat{I}\cdot$ processe…