Determination of the number of $\ddot{I}ˆ(3686)$ events taken at BESIII

BESIII Collaboration, M. Ablikim, M. N. Achasov +647

The number of $\ddot{I}ˆ(3686)$ events collected by the BESIII detector during the 2021 run period is determined to be $(2259.3\pm 11.1)\times 10^6$ by counting inclusive $\ddot{I}ˆ(3686)$ hadro…