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First observation of the electromagnetic Dalitz decay $ψ(3686) \rightarrow μ^+ μ^- η^\prime$
Utilizing $(2712.4 {\pm} 14.3)\times10^{6}~ψ(3686)$ events collected by the BESIII detector at the symmetric $e^+ e^-$ collider BEPCII, we report the first observation of the electromagnetic Dalitz decay $ψ(3686) \to μ^+ μ^-η^{\prime} $ with a statistical significance of 6.1$σ$. The branching fracti
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