The branching fraction of η → e⁺e⁻e⁺e⁻ is measured to be (2.63 ± 0.34_stat ± 0.16_syst) × 10^{-5}.
Petri,Anomalous decays of pseudoscalar mesons, M
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Measurement of the double Dalitz decay $\eta \to e^+e^-e^+e^-$
The branching fraction of η → e⁺e⁻e⁺e⁻ is measured to be (2.63 ± 0.34_stat ± 0.16_syst) × 10^{-5}.