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Search for the lepton number violating process $J/ψ\to K^+K^+e^-e^- +c.c.$

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  • Additional Information
    • Publication Date:
      2025
    • Collection:
      High Energy Physics - Experiment
    • Abstract:
      Based on $(10087\pm 44)\times10^{6}$ $J/ψ$ events collected with the BESIII detector, we search for the lepton number violating decay $J/ψ\to K^+K^+e^-e^- + c.c.$ for the first time. The upper limit on the branching fraction of this decay is set to be $2.1 \times 10^{-9}$ at the 90$\%$ confidence level with a frequentist method. This is the first search for $J/ψ$ decays with the lepton number change by two, offering valuable insights into the underlying physical processes.
      9 pages, 3 figures
    • Accession Number:
      edsarx.2507.06872