Number of J/psi events at BESIII

Abstract

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 (224.0 +/- 1.3) x 10(6) (1088.5 +/- 4.4) x 10(6), 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 (8774 .0 +/- 39 .4) x 10(6). The total number of J/psi events collected with the BESIII detector was determined to be (10087 +/- 44) x 10(6), where the uncertainty is dominated by systematic effects, and the statistical uncertainty is negligible.