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Observation of the double Dalitz decay eta' -> e(+)e(-)e(+)e(-)

Ablikim M.; Achasov M.N.; Adlarson P.; Albrecht M.; Aliberti R.; Kolcu, O. B. (Observation of the double Dalitz decay η′ →e+e-e+e-, 2022)

Based on (10087±44)×106 J/ψ events collected with the BESIII detector at BEPCII, the double Dalitz decay η′→e+e-e+e-is observed for the first time via the J/ψ→γη′ decay process. The significance is found to be 5.7σ with ...