Search for the charmonium weak decays and

Based on (10087 $\textit{±}$ 44) $\textit{×}$ 10 $\textit{J}$/$\textit{ψ}$ events recorded with the BESIII detector, we search for the rare charmonium weak decays and No signal is observed, and upper limits on the branching fractions at the 90% confidence level are set as and . Our results provide the most stringent experimental constraints on these decays.