Key points are not available for this paper at this time.
Abstract The number of ψ (3686) events collected by the BESIII detector during the 2021 run period is determined to be (2259.3±11.1)×10 6 by counting inclusive ψ (3686) hadronic events. The uncertainty is systematic and the statistical uncertainty is negligible. Meanwhile, the numbers of ψ (3686) events collected during the 2009 and 2012 run periods are updated to be (107.7±0.6)×10 6 and (345.4±2.6)×10 6 , respectively. Both numbers are consistent with the previous measurements within one standard deviation. The total number of ψ (3686) events in the three data samples is (2712.4±14.3)×10 6 .
麦 et al. (Tue,) studied this question.