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

N. Taniguchi, M. Nakao, S. Nishida, I. Adachi, H. Aihara, K. Arinstein, T. Aushev, T. Aziz, A. M. Bakich, V. Balagura, A. Bay, K. Belous, V. Bhardwaj, U. Bitenc, A. Bondar, A. Bozek, M. Bračko, T. E. Browder, M. C. Chang, P. ChangY. Chao, A. Chen, K. F. Chen, W. T. Chen, B. G. Cheon, C. C. Chiang, I. S. Cho, Y. Choi, J. Dalseno, M. Dash, A. Drutskoy, W. Dungel, S. Eidelman, B. Golob, H. Ha, J. Haba, T. Hara, K. Hayasaka, H. Hayashii, M. Hazumi, Y. Hoshi, W. S. Hou, H. J. Hyun, T. Iijima, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, M. Iwabuchi, M. Iwasaki, Y. Iwasaki, N. J. Joshi, D. H. Kah, H. Kaji, J. H. Kang, H. Kawai, T. Kawasaki, H. Kichimi, S. K. Kim, Y. I. Kim, Y. J. Kim, K. Kinoshita, S. Korpar, P. Križan, P. Krokovny, R. Kumar, A. Kuzmin, Y. J. Kwon, S. H. Kyeong, J. S. Lange, J. S. Lee, S. E. Lee, T. Lesiak, A. Limosani, S. W. Lin, C. Liu, Y. Liu, D. Liventsev, F. Mandl, S. McOnie, K. Miyabayashi, Y. Miyazaki, G. R. Moloney, Y. Nagasaka, I. Nakamura, E. Nakano, H. Nakazawa, Z. Natkaniec, O. Nitoh, T. Nozaki, S. Ogawa, T. Ohshima, S. Okuno, S. L. Olsen, H. Ozaki, P. Pakhlov, G. Pakhlova, C. W. Park, H. Park, H. K. Park, K. S. Park, L. S. Peak, L. E. Piilonen, H. Sahoo, Y. Sakai, N. Sasao, O. Schneider, J. Schümann, C. Schwanda, A. J. Schwartz, R. Seidl, K. Senyo, M. E. Sevior, M. Shapkin, C. P. Shen, J. G. Shiu, B. Shwartz, J. B. Singh, A. Sokolov, S. Stanič, M. Starič, K. Sumisawa, T. Sumiyoshi, S. Y. Suzuki, N. Tamura, G. N. Taylor, Y. Teramoto, I. Tikhomirov, K. Trabelsi, T. Tsuboyama, S. Uehara, T. Uglov, Y. Unno, S. Uno, P. Urquijo, G. Varner, C. H. Wang, M. Z. Wang, P. Wang, X. L. Wang, Y. Watanabe, R. Wedd, J. Wicht, E. Won, B. D. Yabsley, Y. Yamashita, Y. Yusa, Z. P. Zhang, V. Zhilich, V. Zhulanov, T. Zivko, A. Zupanc, O. Zyukova

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Abstract

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.

Original languageEnglish
Article number111801
JournalPhysical Review Letters
Volume101
Issue number11
DOIs
Publication statusPublished - 2008 Sep 12

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

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., ... Zyukova, O. (2008). Measurement of branching fractions, isospin, and CP-violating asymmetries for exclusive b→dγ modes. Physical Review Letters, 101(11), [111801]. https://doi.org/10.1103/PhysRevLett.101.111801