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

Abstract

The number of $J/ψ$ 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 $J/ψ\rightarrow inclusive$ events, where the uncertainty is the systematic error and the statistical one is negligible.

12 pages, 14 figures; (the paper has been received by the Chinese Physics C.)