Observation of the double Dalitz decay ${\eta }^{\prime }\to e^{+}{e}^{-}{e}^{+}{e}^{-}$

Abstract

Based on $(10087\pm 44)\times 10^6$ $J/\psi$ events collected with the BESIII detector at BEPCII, the double Dalitz decay ${\eta }^{\prime }\to e^{+}{e}^{-}{e}^{+}{e}^{-}$ is observed for the first time via the $J/\psi \to \gamma {\eta }^{\prime }$ decay process. The significance is found to be 5.7$\sigma$ with systematic uncertainties taken into consideration. Its branching fraction is determined to be $\mathcal{B}({\eta }^{\prime }\to e^{+}{e}^{-}{e}^{+}{e}^{-})=(4.5\pm 1.0(stat.)\pm 0.5(sys.))\times 10^{-6}$.

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Cited by in corpus (2)

• Observation of the rare decay of the $\eta$ meson to four muons
• Measurement of the double Dalitz decay $\eta \to e^{+}{e}^{-}{e}^{+}{e}^{-}$