Branching Fraction Measurements of B+→ρ+γ , B0→ρ0γ , and B0→ωγ

Résumé fourni par la source

We present a study of the decays ${B}^{+}\ensuremath{\rightarrow}{\ensuremath{\rho}}^{+}\ensuremath{\gamma}$, ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\rho}}^{0}\ensuremath{\gamma}$, and ${B}^{0}\ensuremath{\rightarrow}\ensuremath{\omega}\ensuremath{\gamma}$. The analysis is based on data containing $347\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ events recorded with the BABAR detector at the PEP-II asymmetric $B$ factory. We measure the branching fractions $\mathcal{B}({B}^{+}\ensuremath{\rightarrow}{\ensuremath{\rho}}^{+}\ensuremath{\gamma})=({1.10}_{\ensuremath{-}0.33}^{+0.37}\ifmmode\pm\else\textpm\fi{}0.09)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$ and $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{\ensuremath{\rho}}^{0}\ensuremath{\gamma})=({0.79}_{\ensuremath{-}0.20}^{+0.22}\ifmmode\pm\else\textpm\fi{}0.06)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$, and set a 90% C.L. upper limit $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}\ensuremath{\omega}\ensuremath{\gamma})<0.78\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$. We also measure the isospin-averaged branching fraction $\mathcal{B}\mathbf{(}B\ensuremath{\rightarrow}(\ensuremath{\rho}/\ensuremath{\omega})\ensuremath{\gamma}\mathbf{)}=({1.25}_{\ensuremath{-}0.24}^{+0.25}\ifmmode\pm\else\textpm\fi{}0.09)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$, from which we determine $|{V}_{\mathrm{td}}/{V}_{\mathrm{ts}}|={0.200}_{\ensuremath{-}0.020}^{+0.021}\ifmmode\pm\else\textpm\fi{}0.015$, where the first uncertainty is experimental and the second is theoretical.

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