No significant signal observed for J/ψ → D_s^- e^+ ν_e + c.c., setting branching fraction upper limit < 9.9 × 10^{-8} at 90% CL and improving prior constraints by an order of magnitude.
Ablikimet al.[BESIII Collaboration], Phys
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Search for the charmonium semi-leptonic weak decay $J/\psi\rightarrow D_s^-e^+\nu_e+c.c.$
No significant signal observed for J/ψ → D_s^- e^+ ν_e + c.c., setting branching fraction upper limit < 9.9 × 10^{-8} at 90% CL and improving prior constraints by an order of magnitude.