We describe searches for B meson decays to the charmless vector-vector final states ωω and ωϕ with 471 × 106BB¯ pairs produced in eþe− annihilation at ffiffiffisp ¼ 10.58 GeV using the BABAR detector at the PEP-II collider at the SLAC National Accelerator Laboratory. We measure the branching fraction BðB0 → ωωÞ ¼ ð1.2 0.3þ0.3 −0.2 Þ × 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 BðB0 → ωϕÞ < 0.7 × 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.

Evidence for the decay B_0→ωω and search for B_0→ωϕ

BIANCHI, Fabrizio;DE MORI, FRANCESCA;
2014-01-01

Abstract

We describe searches for B meson decays to the charmless vector-vector final states ωω and ωϕ with 471 × 106BB¯ pairs produced in eþe− annihilation at ffiffiffisp ¼ 10.58 GeV using the BABAR detector at the PEP-II collider at the SLAC National Accelerator Laboratory. We measure the branching fraction BðB0 → ωωÞ ¼ ð1.2 0.3þ0.3 −0.2 Þ × 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 BðB0 → ωϕÞ < 0.7 × 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.
2014
89
1
8
J. P. Lees;V. Poireau;V. Tisserand;E. Grauges;A. Palano;G. Eigen;B. Stugu;D. N. Brown;L. T. Kerth;Yu. G. Kolomensky;M. J. Lee;G. Lynch;H. ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/156498
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