Measurement of the B 0s → ϕϕ branching fraction and search for the decay B 0 → ϕϕ
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Abstract
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 B 0s → ϕϕ branching fraction is measured to be
B(B0s→ϕϕ)=(1.84±0.05(stat)±0.07(syst)±0.11(fs/fd)±0.12(norm))×10−5,
where f s /f d represents the ratio of the B 0s to B 0 production cross-sections, and the B 0 → 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 B 0 → ϕϕ is also made. No signal is observed, and an upper limit on the branching fraction is set as
B(B0→ϕϕ)<2.8×10−8
at 90% confidence level. This is a factor of seven improvement compared to the previous best limit.
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Aaij, R., Adeva, B., Adinolfi, M. et al. Measurement of the B 0s → ϕϕ branching fraction and search for the decay B 0 → ϕϕ . J. High Energ. Phys. 2015, 53 (2015). https://doi.org/10.1007/JHEP10(2015)053
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© CERN, for the benefit of the LHCb Collaboration. Article funded by SCOAP3. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0), which permits use, duplication, adaptation, distribution, and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made