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The observation of any charged lepton flavor violation (CLFV) process wouldbe a clear signal of new physics beyond the Standard Model. Various decaymodes, including lepton ($\mu, \tau$) decays, pseudoscalar meson ($K,\pi$)decays, vector meson ($\phi, J/\psi, \Upsilon$) decays, and Higgs decays, havebeen explored to detect CLFV. Focusing on the search for CLFV at the$\tau$-charm region, the results of the search for $J/\psi\to e\tau / e\mu$using the 10 billion $J/\psi$ events collected by the BESIII experiment arepresented. The upper limits (ULs) at the 90$\%$ confidence level are$\mathcal{B}(J/\psi\to e^\pm\tau^\mp)<7.5\times10^{-8}$ and$\mathcal{B}(J/\psi\to e^\pm\mu^\mp)<4.5\times10^{-9}$, respectively. Improvingthe previously published limits by two orders of magnitudes, the results arethe most stringent CLFV searches in heavy quarkonium system.

Search for Charged Lepton Flavor Violation in $J/\psi$ decays at BESIII