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 systematic uncertainties taken into consideration. Its branching fraction is determined to be B(η′→e+e-e+e-)=(4.5±1.0(stat)±0.5(sys))×10-6
Observation of the double Dalitz decay η′ →e+e-e+e-
I. Garzia;
2022
Abstract
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 systematic uncertainties taken into consideration. Its branching fraction is determined to be B(η′→e+e-e+e-)=(4.5±1.0(stat)±0.5(sys))×10-6File in questo prodotto:
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