Phys. Rev. Lett.
96,
221601
(2006)
[5 pages]
Observation of b→dγ and Determination of |Vtd/Vts|
D. Mohapatra et al. Belle Collaboration
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D. Mohapatra48, M. Nakao6, S. Nishida6, K. Abe6, K. Abe41, I. Adachi6, H. Aihara43, D. Anipko1, K. Arinstein1, Y. Asano47, V. Aulchenko1, T. Aushev10, S. Bahinipati3, A. M. Bakich38, V. Balagura10, M. Barbero5, I. Bedny1, U. Bitenc11, I. Bizjak11, S. Blyth21, A. Bondar1, A. Bozek24, M. Bračko6,17,11, T. E. Browder5, Y. Chao23, A. Chen21, K.-F. Chen23, W. T. Chen21, B. G. Cheon2, R. Chistov10, Y. Choi37, A. Chuvikov32, S. Cole38, J. Dalseno18, M. Danilov10, M. Dash48, J. Dragic6, A. Drutskoy3, S. Eidelman1, D. Epifanov1, S. Fratina11, N. Gabyshev1, T. Gershon6, G. Gokhroo39, B. Golob16,11, A. Gorišek11, H. C. Ha13, J. Haba6, T. Hara29, N. C. Hastings43, K. Hayasaka19, H. Hayashii20, M. Hazumi6, L. Hinz15, T. Hokuue19, Y. Hoshi41, S. Hou21, W.-S. Hou23, Y. B. Hsiung23, T. Iijima19, A. Imoto20, K. Inami19, A. Ishikawa6, H. Ishino44, R. Itoh6, M. Iwasaki43, Y. Iwasaki6, J. H. Kang49, S. U. Kataoka20, N. Katayama6, T. Kawasaki26, H. R. Khan44, H. Kichimi6, H. J. Kim14, H. O. Kim37, S. M. Kim37, K. Kinoshita3, S. Korpar17,11, P. Križan16,11, P. Krokovny1, R. Kulasiri3, R. Kumar30, C. C. Kuo21, A. Kuzmin1, Y.-J. Kwon49, J. S. Lange4, G. Leder8, J. Lee36, T. Lesiak24, A. Limosani6, S.-W. Lin23, D. Liventsev10, G. Majumder39, F. Mandl8, D. Marlow32, T. Matsumoto45, A. Matyja24, W. Mitaroff8, K. Miyabayashi20, H. Miyake29, H. Miyata26, Y. Miyazaki19, R. Mizuk10, G. R. Moloney18, T. Mori44, E. Nakano28, O. Nitoh46, T. Nozaki6, S. Ogawa40, T. Ohshima19, T. Okabe19, S. Okuno12, S. L. Olsen5, H. Ozaki6, P. Pakhlov10, H. Palka24, C. W. Park37, N. Parslow38, L. S. Peak38, R. Pestotnik11, L. E. Piilonen48, A. Poluektov1, F. J. Ronga6, M. Rozanska24, Y. Sakai6, T. R. Sarangi6, N. Sato19, T. Schietinger15, O. Schneider15, J. Schümann23, C. Schwanda8, A. J. Schwartz3, R. Seidl33, M. E. Sevior18, M. Shapkin9, H. Shibuya40, B. Shwartz1, V. Sidorov1, A. Sokolov9, A. Somov3, N. Soni30, R. Stamen6, S. Stanič27, M. Starič11, T. Sumiyoshi45, S. Suzuki34, O. Tajima6, F. Takasaki6, K. Tamai6, N. Tamura26, M. Tanaka6, G. N. Taylor18, Y. Teramoto28, X. C. Tian31, K. Trabelsi5, T. Tsukamoto6, S. Uehara6, T. Uglov10, K. Ueno23, Y. Unno6, S. Uno6, P. Urquijo18, Y. Usov1, G. Varner5, K. E. Varvell38, S. Villa15, C. C. Wang23, C. H. Wang22, M.-Z. Wang23, Y. Watanabe44, J. Wicht15, E. Won13, Q. L. Xie7, B. D. Yabsley38, A. Yamaguchi42, Y. Yamashita25, M. Yamauchi6, J. Ying31, Y. Yusa42, L. M. Zhang35, Z. P. Zhang35, V. Zhilich1, and D. Zürcher15 (Belle Collaboration)
1Budker Institute of Nuclear Physics, Novosibirsk
2Chonnam National University, Kwangju
3University of Cincinnati, Cincinnati, Ohio 45221
4University of Frankfurt, Frankfurt
5University of Hawaii, Honolulu, Hawaii 96822
6High Energy Accelerator Research Organization (KEK), Tsukuba
7Institute of High Energy Physics, Chinese Academy of Sciences, Beijing
8Institute of High Energy Physics, Vienna
9Institute of High Energy Physics, Protvino
10Institute for Theoretical and Experimental Physics, Moscow
11J. Stefan Institute, Ljubljana
12Kanagawa University, Yokohama
13Korea University, Seoul
14Kyungpook National University, Taegu
15Swiss Federal Institute of Technology of Lausanne, EPFL, Lausanne
16University of Ljubljana, Ljubljana
17University of Maribor, Maribor
18University of Melbourne, Victoria
19Nagoya University, Nagoya
20Nara Women’s University, Nara
21National Central University, Chung-li
22National United University, Miao Li
23Department of Physics, National Taiwan University, Taipei
24H. Niewodniczanski Institute of Nuclear Physics, Krakow
25Nippon Dental University, Niigata
26Niigata University, Niigata
27Nova Gorica Polytechnic, Nova Gorica
28Osaka City University, Osaka
29Osaka University, Osaka
30Panjab University, Chandigarh
31Peking University, Beijing
32Princeton University, Princeton, New Jersey 08544
33RIKEN BNL Research Center, Upton, New York 11973
34Saga University, Saga
35University of Science and Technology of China, Hefei
36Seoul National University, Seoul
37Sungkyunkwan University, Suwon
38University of Sydney, Sydney NSW
39Tata Institute of Fundamental Research, Bombay
40Toho University, Funabashi
41Tohoku Gakuin University, Tagajo
42Tohoku University, Sendai
43Department of Physics, University of Tokyo, Tokyo
44Tokyo Institute of Technology, Tokyo
45Tokyo Metropolitan University, Tokyo
46Tokyo University of Agriculture and Technology, Tokyo
47University of Tsukuba, Tsukuba
48Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
49Yonsei University, Seoul
Received 13 February 2006; published 9 June 2006
We report the observation of the flavor-changing neutral current process b→dγ using a sample of 386×106 B meson pairs accumulated by the Belle detector at the KEKB e+e- collider. We measure branching fractions for the exclusive modes B-→ρ-γ, B̅ 0→ρ0γ, and B̅ 0→ωγ. Assuming that these three modes are related by isospin, we find B(B̅ →(ρ,ω)γ)=(1.32-0.31+0.34(stat)-0.09+0.10(syst))×10-6 with a significance of 5.1σ. This result is used to determine the ratio of Cabibbo-Kobayashi-Maskawa matrix elements |Vtd/Vts| to be 0.199-0.025+0.026(exp)-0.015+0.018(theor).
© 2006 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.96.221601
DOI:
10.1103/PhysRevLett.96.221601
PACS:
13.20.He, 12.15.Hh, 12.15.Mm, 14.40.Nd
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