Search for the rare decay $B^0\to J\mathrm{/}\psi \varphi$

A search for the rare decay $B^0\to J\mathrm{/}\psi \varphi$ is performed using $pp$ collision data collected with the LHCb detector at centre-of-mass energies of 7, 8 and 13 TeV, corresponding to an integrated luminosity of 9 ${\rm fb}^{-1}$\mathrm{.}Nosignificantsignalofthedecayisobservedandanupperlimitof$1.1 \times 10^{-7}$ at 90% confidence level is set on the branching fraction.