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Using $(1310.6 \pm 7.0) \times 10^{6}~J/\psi$ events acquired with the BESIIIdetector at the BEPCII storage rings, the decay$\eta^\prime\rightarrow\pi^+\pi^-\mu^+\mu^-$ is observed for the first timewith a significance of 8$\sigma$ via the process$J/\psi\rightarrow\gamma\eta'$. We measure the branching fraction of$\eta^\prime\rightarrow\pi^+\pi^-\mu^+\mu^-$ to be$\mathcal{B}(\eta^\prime\rightarrow\pi^+\pi^-\mu^+\mu^-)$=(1.97$\pm$0.33(stat.)$\pm$0.18(syst.))$\times10^{-5}$,where the first and second uncertainties are statistical and systematic,respectively.

Observation of $\eta^\prime\rightarrow\pi^+\pi^-\mu^+\mu^-$