Observation of ${\eta }^{\prime }\to {\pi }^{+}{\pi }^{-}{\mu }^{+}{\mu }^{-}$

Abstract

Using $(1310.6\pm 7.0)\times 10^{6}J/\psi$ events acquired with the BESIII detector at the BEPCII storage rings, the decay ${\eta }^{\prime }\to {\pi }^{+}{\pi }^{-}{\mu }^{+}{\mu }^{-}$ is observed for the first time with a significance of 8$\sigma$ via the process $J/\psi \to \gamma {\eta }^{\prime }$. We measure the branching fraction of ${\eta }^{\prime }\to {\pi }^{+}{\pi }^{-}{\mu }^{+}{\mu }^{-}$ to be $\mathcal{B}({\eta }^{\prime }\to {\pi }^{+}{\pi }^{-}{\mu }^{+}{\mu }^{-})$=(1.97$\pm$0.33(stat.)$\pm$0.18(syst.))$\times 10^{-5}$, where the first and second uncertainties are statistical and systematic, respectively.

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Cited by in corpus (5)

• Novel approach to investigate $\eta$ decays via ${\eta }^{\prime }\to \pi \pi \eta$
• $CP$ violation in ${\eta }^{(\prime )}\to {\pi }^{+}{\pi }^{-}{\mu }^{+}{\mu }^{-}$ decays
• ${\eta }^{{(}^{\prime })}\to {\pi }^{+}{\pi }^{-}{\gamma }^{(\ast )}$ in large-$N_c$ chiral perturbation theory
• Study of $\eta \to {\pi }^{+}{\pi }^{-}{l}^{+}{l}^{-}$
• Axion-like particles from soft supersymmetry breaking