\begin{document}$ B^0\to J/ \psi\phi$\end{document} is performed using \begin{document}$ pp$\end{document} collision data collected with the LHCb dete-ctor at centre-of-mass energies of 7, 8 and 13 TeV, corresponding to an integrated luminosity of 9 fb−1. No significant signal of the decay is observed and an upper limit of \begin{document}$ 1.1 \times 10^{-7}$\end{document} at 90% confidence level is set on the branching fraction."> Search for the rare decay <i>B</i><sup>0</sup> → <i>J</i>/<i>ψϕ</i> -
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