Lees, J. P.Poireau, V.Tisserand, V.Grauges, E.Palano, A.Eigen, G.Stugu, B.Lou, XinchouIzen, Joseph M.BaBar Collaboration2014-10-012014-10-012014-03-052014-03-052013-12-031550-7998http://hdl.handle.net/10735.1/4040We describe searches for B meson decays to the charmless vector-vector final states ωω and ωφ with 471 x 10⁶ BB̅ pairs produced in e⁺e⁻ annihilation at √s̅ = 10.58 GeV using the BABAR detector at the PEP-II collider at the SLAC National Accelerator Laboratory. We measure the branching fraction ℬ(B⁰ → ωω) = (1.2 ± 0.3_{-0.2}^{+0.3}) x 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(B⁰ → ωφ) < 0.7 x 10⁻⁶ at 90% confidence level. These measurements provide the first evidence for the decay B⁰ → ωω, and an improvement of the upper limit for the decay B⁰ → ωφ.en-US©2014 American Physical SocietyB mesonsBranching fractionsMass (Physics)TextLees, J. P., V. Poireau, V. Tisserand, E. Grauges, et al. 2014. "Evidence for the decay B⁰ → ωω and search for B⁰ → ωφ." Physical Review D 89(5), doi: 10.1103/PhysRevD.89.051101895