Number of events at BESIII

Using inclusive decays of $J/\psi $ , a precise determination of the number of $J/\psi $ events collected with the BESIII detector was performed. For the two data sets taken in 2009 and 2012, the numbers of $J/\psi $ events were recalculated to be $J/\psi $ and $J/\psi $ , respectively; these numbers are in good agreement with the previous measurements. For the $J/\psi $ sample taken in 2017–2019, the number of events was determined to be $J/\psi $ . The total number of $J/\psi $ events collected with the BESIII detector was determined to be $J/\psi $ , where the uncertainty is dominated by systematic effects, and the statistical uncertainty is negligible.