Determination of the number of J/$\psi$ events with J/$\psi$ \rightarrow decays

TL;DR

This paper reports the precise determination of the number of J/ψ events collected by BESIII in 2009, crucial for subsequent physics analyses, with a detailed methodology based on inclusive decay events.

Contribution

It introduces a method to accurately count J/ψ events using inclusive decay channels, providing a key dataset for future studies.

Findings

Number of J/ψ events: (225.3 ± 2.8) million

Systematic uncertainty quantified, negligible statistical error

Method improves accuracy of event counting for J/ψ studies

Abstract

The number of $J/\psi$ events collected with the BESIII detector at the BEPCII from June 12 to July 28, 2009 is determined to be $(225.3\pm2.8)\times10^{6}$ using $J/\psi \rightarrow inclusive$ events, where the uncertainty is the systematic error and the statistical one is negligible.