Observation of the double Dalitz decay η′ →e+e-e+e-
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CitationAblikim, M., Achasov, M. N., Adlarson, P., Albrecht, M., Aliberti, R., Amoroso, A., ... & Kalantar-Nayestanaki, N. (2022). Observation of the double Dalitz decay $\eta'\to e^+ e^-e^+ e^-$. arXiv preprint arXiv:2203.12229.
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. © 2022 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.