Speaker
Description
The observation of any CLFV process would be a clear signal of new physics beyond the Standard Model. Various decay modes, including lepton ($\mu$, $\tau$) decays, pseudoscalar meson (K, $\pi$) decays, vector meson ($\phi$, $J/\psi$, $\Upsilon$) decays, and Higgs decays, have been explored to detect the violation. This presentation focuses on the search for CLFV at the BESIII experiment, the results of the search for $J/\psi→e\tau/e\mu$ using the 10 billion $J/\psi$ events collected by the BESIII experiment are presented. The upper limits at the 90% confidence level are B($J/\psi$→e$\tau$) < $7.5×10^{-8}$ and B($J/\psi$→e$\mu$) < $4.5×10^{-9}$, respectively. Improving the previously published limits by two orders of magnitudes, the results are the most stringent CLFV searches in heavy quarkonium systems.
