Measurement of the $B_s^0 \to φ φ$ branching fraction and search for the decay $B^0 \to φ φ$статья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 марта 2016 г.
Аннотация:Using a dataset corresponding to an integrated luminosity of 3.0fb−1 collected in pp collisions at centre-of-mass energies of 7 and 8 TeV, the B0s→ϕϕ branching fraction is measured to be \mathcal{B}(B^0_s → \phi \phi) = \left( 1.84 \pm 0.05 (stat) \pm 0.07 (syst) \pm 0.11 (f_s/f_d) \pm 0.12 (\text{norm}) \right) \times 10^{-5}, where fs/fd represents the ratio of the B0s 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 as \mathcal{B}(B^0 → \phi \phi) < 2.8 \times 10^{-8} at 90% confidence level. This is a factor of seven improvement compared to the previous best limit.