Measurement of branching fractions, isospin and CP-violating asymmetries for exclusive \boldmath$b\to d\gamma$ modes

Abstract

We report new measurements of the decays $B\to {\rho }^{+}\gamma$, $B\to {\rho }^0\gamma$ and $B\to \omega \gamma$ using a data sample of $657\times 10^6$ $B$ meson pairs accumulated with the Belle detector at the KEKB $e^{+}{e}^{-}$ collider. We measure branching fractions $\mathcal{B}(B^{+}\to {\rho }^{+}\gamma )=(8.7_{-2.7}^{+2.9}{}_{-1.1}^{+0.9})\times 10^{-7}$, $\mathcal{B}(B^0\to {\rho }^0\gamma )=(7.8_{-1.6}^{+1.7}{}_{-1.0}^{+0.9})\times 10^{-7}$ and $\mathcal{B}(B^0\to \omega \gamma )=(4.0_{-1.7}^{+1.9}\pm 1.3)\times 10^{-7}$. We also report the isospin asymmetry $\Delta (\rho \gamma )=-0.48_{-0.19}^{+0.21}{}_{-0.09}^{+0.08}$; and the first measurement of the direct CP-violating asymmetry $A_{CP}(B^{+}\to {\rho }^{+}\gamma )=-0.11\pm 0.32\pm 0.09$, where the first and second errors are statistical and systematic, respectively.

6 pages, 8 figures, submitted to PRL

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