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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2008, vol. 101, p. -

Measurement of branching fractions, isospin, and CP-violating asymmetries for exclusive b→dγ modes

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., Bračko 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., Križan P., Krokovny P., Kumar R., Kuzmin A., Kwon Y. J., Kyeong S. H., Lange J. S., Lee J. S., Lee S. E., Lesiak T., Limosani A., Lin S. W., Liu C., Liu Y., Liventsev D., Mandl F., McOnie S., Miyabayashi K., Miyazaki Y., Moloney G. R., Nagasaka Y., Nakamura I., Nakano E., Nakazawa H., Natkaniec Z., Nitoh O., Nozaki T., Ogawa S., Ohshima T., Okuno S., Olsen S. L.

We report new measurements of the decays B+→ρ+γ, B0→ρ0γ, and B0→ωγ using a data sample of 657×106 B meson pairs accumulated with the Belle detector at the KEKB e+e- collider. We measure branching fractions B(B+→ρ+γ)=(8.7-2.7-1. 1+2.9+0.9)×10-7, B(B0→ρ0γ)=(7.8-1.6-1.0+1.7+0.9)×10- 7, and B(B0→ωγ)=(4.0-1.7+1.9±1.3)×10-7. We also report the isospin asymmetry Δ(ργ)=-0.48-0.19-0.09+0.21+0.08 and the first measurement of the direct CP-violating asymmetry ACP(B+→ρ +γ)=-0.11±0.32±0.09, where the first and second errors are statistical and systematic, respectively. © 2008 The American Physical Society.