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.File | Dimensione | Formato | |
---|---|---|---|
PhysRevD.89.051101.pdf
Accesso aperto
Tipo di file:
PDF EDITORIALE
Dimensione
252.52 kB
Formato
Adobe PDF
|
252.52 kB | Adobe PDF | Visualizza/Apri |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.