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Evidence for the decay B0 → ωω and search for B0 → ωϕ
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We describe searches for B meson decays to the charmless vector-vector final states ω ω and ω ϕ with 471 × 1 0 6 B ¯ B pairs produced in e + e − annihilation at √ s = 10.58 GeV using the BABAR detector at the PEP-II collider at the SLAC National Accelerator Laboratory. We measure the branching fraction B ( B 0 → ω ω ) = ( 1.2 ± 0.3 + 0.3 − 0.2 ) × 10 − 6 , where the first uncertainty is statistical and the second is systematic, corresponding to a significance of 4.4 standard deviations. We also determine the upper limit B ( B 0 → ω ϕ ) < 0.7 × 10 − 6 at 90% confidence level. These measurements provide the first evidence for the decay B 0 → ω ω , and an improvement of the upper limit for the decay B 0 → ω ϕ .
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GRAUGÉS POUS, Eugeni and BABAR Collaboration. Evidence for the decay B0 → ωω and search for B0 → ωϕ. Physical Review D. 2014. Vol. 89, num. 5, pags. 051101(R). ISSN 1550-7998. [consulted: 16 of June of 2026]. Available at: https://hdl.handle.net/2445/131190