\begin{document}$ (1.0087\pm0.0044)\times10^{10} $\end{document} \begin{document}$ J/\psi $\end{document}events collected using the BESIII detector at the BEPCII collider, we firstly search for the lepton number violation decay \begin{document}$ \phi \to \pi^+ \pi^+ e^- e^- $\end{document} via \begin{document}$ J/\psi\to \phi\eta $\end{document}. No obviously signals are found. The upper limit on the branching fraction of \begin{document}$ \phi \to \pi^+ \pi^+ e^- e^- $\end{document}is set to be \begin{document}$ 1.3\times10^{-5} $\end{document} at the 90% confidence level."> Search for the lepton number violation decay <i>ϕ</i> → <i>π</i><sup>+</sup><i>π</i><sup>+</sup><i>e</i><sup>−</sup><i>e</i><sup>−</sup> via <i>J</i>/<i>ψ</i> → <i>ϕη</i> -
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