Evidence for the decay B0→ωω and search for B0→ωϕ

Le résumé fourni par la source

We describe searches for $B$ meson decays to the charmless vector-vector final states $\ensuremath{\omega}\ensuremath{\omega}$ and $\ensuremath{\omega}\ensuremath{\phi}$ with $471\ifmmode\times\else\texttimes\fi{}1{0}^{6}B\overline{B}$ pairs produced in ${e}^{+}{e}^{\ensuremath{-}}$ annihilation at $\sqrt{s}=10.58\text{ }\text{ }\mathrm{GeV}$ using the BABAR detector at the PEP-II collider at the SLAC National Accelerator Laboratory. We measure the branching fraction $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}\ensuremath{\omega}\ensuremath{\omega})=(1.2\ifmmode\pm\else\textpm\fi{}{0.3}_{\ensuremath{-}0.2}^{+0.3})\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$, 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 $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}\ensuremath{\omega}\ensuremath{\phi})<0.7\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$ at 90% confidence level. These measurements provide the first evidence for the decay ${B}^{0}\ensuremath{\rightarrow}\ensuremath{\omega}\ensuremath{\omega}$, and an improvement of the upper limit for the decay ${B}^{0}\ensuremath{\rightarrow}\ensuremath{\omega}\ensuremath{\phi}$.

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