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Measurement of the Bs → ϕϕ branching fraction and search for the decay → ϕϕ

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Original languageEnglish
Article number053
Number of pages18
JournalJournal of High Energy Physics
Issue number10
Publication statusPublished - 8 Oct 2015


Using a dataset corresponding to an integrated luminosity of 3.0 fb−1 collected in pp collisions at centre-of-mass energies of 7 and 8 TeV, the Bs0 → ϕϕ branching fraction is measured to beB(B0s→ϕϕ)=(1.84±0.05(stat)±0.07(syst)±0.11(fs/fd)±0.12(norm))×10−5,B(Bs0→ϕϕ)=(1.84±0.05(stat)±0.07(syst)±0.11(fs/fd)±0.12(norm))×10−5,where fs/fd represents the ratio of the Bs0 to B0 production cross-sections, and the B0 → ϕK*(892)0 decay mode is used for normalization. This is the most precise measurement of this branching fraction to date, representing a factor five reduction in the statistical uncertainty compared with the previous best measurement. A search for the decay B0 → ϕϕ is also made. No signal is observed, and an upper limit on the branching fraction is set asB(B0→ϕϕ)<2.8×10−8B(B0→ϕϕ)<2.8×10−8at 90% confidence level. This is a factor of seven improvement compared to the previous best limit.

    Research areas

  • Hadron-Hadron Scattering, Branching fraction, B physics, Flavor physics, POLARIZATION, ASYMMETRIES

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