arxiv: 2510.25100 · v5 · submitted 2025-10-29 · ✦ hep-ex
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Search for the charmonium semi-leptonic weak decay J/psirightarrow D_s^-e^+ν_e+c.c.
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Using a data sample of $(10087 \pm 44) \times 10^6$ $J/\psi$ events collected with the BESIII detector at a centre-of-mass energy of $\sqrt{s}=3.097\ \textrm{GeV}$, a dedicated search for the charmonium semileptonic weak decay $J/\psi\rightarrow D_s^-e^+\nu_e + \text{c.c.}$ is performed. No significant signal is observed. An upper limit on the branching fraction is set at $\mathcal{B}(J/\psi\rightarrow D_s^- e^+ \nu_e + \text{c.c.}) < 9.9 \times 10^{-8}$ at the 90\% confidence level. This result improves upon previous constraints by an order of magnitude, representing the most stringent experimental limit to date. It thus provides a critical test of Standard Model predictions and new physics scenarios in heavy-quark dynamics.
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