What question did this study set out to answer?

The aim is to accurately measure the number of J/ψ events using inclusive decay methods.

April 16, 2026Open Access

Determination of the number of J/ψ events with inclusive J/ψ decays

Key Points

The aim is to accurately measure the number of J/ψ events using inclusive decay methods.
Utilized the BESIII detector for data collection in 2009 and 2012
Recalculated event numbers with improved software
Analyzed inclusive decays of J/ψ for event counting
Number of J/ψ events for 2009 is (223.7±1.4)×10^6
Number of J/ψ events for 2012 is (1086.9±6.0)×10^6
Total number of collected J/ψ events is (1310.6±7.0)×10^6
Uncertainty primarily due to systematic effects

Abstract

A measurement of the number of J/ events collected with the BESIII detector in 2009 and 2012 is performed using inclusive decays of the J/. The number of J/ events taken in 2009 is recalculated to be (223. 71. 4) 10⁶, which is in good agreement with the previous measurement, but with significantly improved precision due to improvements in the BESIII software. The number of J/ events taken in 2012 is determined to be (1086. 9 6. 0) 10⁶. In total, the number of J/ events collected with the BESIII detector is measured to be (1310. 6 7. 0) 10⁶, where the uncertainty is dominated by systematic effects and the statistical uncertainty is negligible.

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