NRQCD calculations predict low event yields (0-172) and poor significances (10^{-6} to 10^{-1}) for dark photon mediated J/ψ decays at BESIII, with four-body invisible channels offering relatively better prospects below 0.2 GeV.
Physics Program of the Super Tau-Charm Factory,
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Searching for dark photons in $J/\psi$ decays
NRQCD calculations predict low event yields (0-172) and poor significances (10^{-6} to 10^{-1}) for dark photon mediated J/ψ decays at BESIII, with four-body invisible channels offering relatively better prospects below 0.2 GeV.