Measurements of branching fractions forB+→ρ+γ,B0→ρ0γ, andB0→ωγ

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Abstract

We present branching fraction measurements for the radiative 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 a data sample of $465\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ events collected with the BABAR detector at the PEP-II asymmetric-energy $B$ Factory located at the Stanford Linear Accelerator Center. We find $\mathcal{B}({B}^{+}\ensuremath{\rightarrow}{\ensuremath{\rho}}^{+}\ensuremath{\gamma})=({1.20}_{\ensuremath{-}0.37}^{+0.42}\ifmmode\pm\else\textpm\fi{}0.20)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$, $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{\ensuremath{\rho}}^{0}\ensuremath{\gamma})=({0.97}_{\ensuremath{-}0.22}^{+0.24}\ifmmode\pm\else\textpm\fi{}0.06)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$, and a 90% C.L. upper limit $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}\ensuremath{\omega}\ensuremath{\gamma})<0.9\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$, where the first error is statistical and the second is systematic. We also measure the isospin-violating quantity $\ensuremath{\Gamma}({B}^{+}\ensuremath{\rightarrow}{\ensuremath{\rho}}^{+}\ensuremath{\gamma})/2\ensuremath{\Gamma}({B}^{0}\ensuremath{\rightarrow}{\ensuremath{\rho}}^{0}\ensuremath{\gamma})\ensuremath{-}1=\ensuremath{-}{0.43}_{\ensuremath{-}0.22}^{+0.25}\ifmmode\pm\else\textpm\fi{}0.10$.

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