Speaker
Evgenii Baldin
(BINP)
Description
The ratio of the partial width of $J/\psi$ decays into $e^+e^-$ and $\mu^+\mu^-$ pairs are measured using a data sample of $7\cdot10^{6}$ \(J/\psi\) events recorded by the KEDR detector at the VEPP-4M collider. Our preliminary
result are:
\[\Gamma_{ee}/\Gamma_{\mu\mu}=0.9965\pm0.0045\pm0.0050.\]
Primary author
Evgenii Baldin
(BINP)
