BESIII presents experimental searches for sub-GeV dark matter via invisible decays, dark baryons, light vector bosons, and baryon/lepton-number-violating processes in charmonium and hyperon decays.
Search for the charmonium semi-leptonic weak decay $J/\psi\rightarrow D_s^-e^+\nu_e+c.c.$
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abstract
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.
fields
hep-ex 2years
2026 2verdicts
UNVERDICTED 2representative citing papers
BESIII sets the most stringent upper limits to date on semileptonic, nonleptonic, and FCNC charmonium weak decays using over 10^10 J/ψ and 2.7×10^9 ψ(2S) events.
citing papers explorer
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Search for dark sector and rare decays at BESIII
BESIII presents experimental searches for sub-GeV dark matter via invisible decays, dark baryons, light vector bosons, and baryon/lepton-number-violating processes in charmonium and hyperon decays.
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Mini-review of charmonium weak decays at BESIII
BESIII sets the most stringent upper limits to date on semileptonic, nonleptonic, and FCNC charmonium weak decays using over 10^10 J/ψ and 2.7×10^9 ψ(2S) events.