# metadata.dc.description.abstract[].value
The B s 0  → J/ψϕϕ decay is observed in pp collision data corresponding to an integrated luminosity of 3 fb−1 recorded by the LHCb detector at centre-of-mass energies of 7 TeV and 8 TeV. This is the first observation of this decay channel, with a statistical significance of 15 standard deviations. The mass of the B s 0 meson is measured to be 5367.08 ± 0.38 ± 0.15 MeV/c2. The branching fraction ratio ℬ(B s 0  → J/ψϕϕ)/ℬ(B s 0  → J/ψϕ) is measured to be 0.0115 ± 0.0012 − 0.0009 + 0.0005 . In both cases, the first uncertainty is statistical and the second is systematic. No evidence for non-resonant B s 0  → J/ψϕK + K − or B s 0  → J/ψK + K − K + K − decays is found.

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Journal of High Energy Physics, 2016, vol. 2016, num. 40

# metadata.dc.rights[].value
cc-by (c) LHCb Collaboration et al., 2016

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Articles publicats en revistes (Física Quàntica i Astrofísica)