Dark photon and dark Z contributions to J/ψ → e+e−φ are far below the experimental limit, making the channel insensitive to these mediators.
Determination of the number of J/$\psi$ events with J/$\psi$ \rightarrow decays
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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.
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Searching for neutral state in the rare decay $J/\psi \rightarrow e^+ e^- \phi$
Dark photon and dark Z contributions to J/ψ → e+e−φ are far below the experimental limit, making the channel insensitive to these mediators.