1207.2865 (BESIII collaboration)

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

BESIII collaboration

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.

View original: http://arxiv.org/abs/1207.2865