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Measurement of branching fractions, isospin, and CP-violating asymmetries for exclusive b-->dgamma modes |
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| Authors: | Taniguchi N Nakao M Nishida S Adachi I Aihara H Arinstein K Aushev T Aziz T Bakich A M Balagura V Bay A Belous K Bhardwaj V Bitenc U Bondar A Bozek A Bracko M Browder T E Chang M-C Chang P Chao Y Chen A Chen K-F Chen W T Cheon B G Chiang C-C Cho I-S Choi Y Dalseno J Dash M Drutskoy A Dungel W Eidelman S Golob B Ha H Haba J Hara T Hayasaka K Hayashii H Hazumi M Hoshi Y Hou W-S Hyun H J Iijima T Inami K Ishikawa A Ishino H Itoh R Iwabuchi M Iwasaki M Iwasaki Y Joshi N J Kah D H Kaji H Kang J H Kawai H Kawasaki T Kichimi H Kim S K Kim Y I Kim Y J Kinoshita K Korpar S Krizan P Krokovny P Kumar R |
| Institution: | Kyoto University, Kyoto. |
| Abstract: | We report new measurements of the decays B+-->rho+gamma, B0-->rho0gamma, and B0-->omegagamma using a data sample of 657x10(6) B meson pairs accumulated with the Belle detector at the KEKB e+e- collider. We measure branching fractions B(B+-->rho+gamma)=(8.7_-2.7-1.1;+2.9+0.9)x10(-7), B(B0-->rho0gamma)=(7.8_-1.6-1.0;+1.7+0.9)x10(-7), and B(B0-->omegagamma)=(4.0_-1.7;+1.9+/-1.3)x10(-7). We also report the isospin asymmetry Delta(rhogamma)=-0.48_-0.19-0.09;+0.21+0.08 and the first measurement of the direct CP-violating asymmetry ACP(B+-->rho+gamma)=-0.11+/-0.32+/-0.09, where the first and second errors are statistical and systematic, respectively. |
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