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The $B_s^0 \rightarrow J/\psi \phi \phi$ decay is observed in $pp$ collisiondata corresponding to an integrated luminosity of 3 fb$^{-1}$ recorded by theLHCb detector at centre-of-mass energies of 7 TeV and 8 TeV. This is the firstobservation of this decay channel, with a statistical significance of 15standard deviations. The mass of the $B_s^0$ meson is measured to be$5367.08\,\pm \,0.38\,\pm\, 0.15$ MeV/c$^2$. The branching fraction ratio$\mathcal{B}(B_s^0 \rightarrow J/\psi \phi \phi)/\mathcal{B}(B_s^0 \rightarrowJ/\psi \phi)$ is measured to be $0.0115\,\pm\, 0.0012\, ^{+0.0005}_{-0.0009}$.In both cases, the first uncertainty is statistical and the second issystematic. No evidence for non-resonant $B_s^0 \rightarrow J/\psi \phi K^+K^-$ or $B_s^0 \rightarrow J/\psi K^+ K^- K^+ K^-$ decays is found.

Observation of the $B_s^0 \rightarrow J/\psi \phi \phi$ decay