Phys. Rev. Lett.
92,
171802
(2004)
[6 pages]
Upper Bound on the Decay τ→μγ from the Belle Detector
K. Abe et al. Belle Collaboration
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K. Abe6, K. Abe38, T. Abe6, I. Adachi6, Byoung Sup Ahn13, H. Aihara40, K. Akai6, M. Akatsu19, M. Akemoto6, Y. Asano45, T. Aso44, V. Aulchenko1, T. Aushev10, A. M. Bakich35, Y. Ban30, S. Banerjee36, A. Bay15, I. Bedny1, I. Bizjak11, A. Bondar1, A. Bozek24, M. Bračko17,11, T. E. Browder5, Y. Chao23, K.-F. Chen23, B. G. Cheon34, R. Chistov10, S.-K. Choi4, Y. Choi34, Y. K. Choi34, A. Chuvikov31, M. Danilov10, L. Y. Dong8, A. Drutskoy10, S. Eidelman1, V. Eiges10, Y. Enari19, J. Flanagan6, C. Fukunaga42, K. Furukawa6, N. Gabyshev6, A. Garmash1,6, T. Gershon6, R. Guo21, J. Haba6, C. Hagner47, F. Handa39, H. Hayashii20, M. Hazumi6, T. Hokuue19, Y. Hoshi38, W.-S. Hou23, H.-C. Huang23, T. Iijima19, H. Ikeda6, K. Inami19, A. Ishikawa19, R. Itoh6, H. Iwasaki6, M. Iwasaki40, Y. Iwasaki6, J. H. Kang49, J. S. Kang13, N. Katayama6, H. Kawai2, T. Kawasaki26, H. Kichimi6, E. Kikutani6, H. J. Kim49, J. H. Kim34, S. K. Kim33, K. Kinoshita3, P. Koppenburg6, S. Korpar17,11, P. Krokovny1, R. Kulasiri3, A. Kuzmin1, Y.-J. Kwon49, S. H. Lee33, T. Lesiak24, J. Li32, A. Limosani18, S.-W. Lin23, D. Liventsev10, F. Mandl9, T. Matsumoto42, A. Matyja24, S. Michizono6, T. Mimashi6, W. Mitaroff9, K. Miyabayashi20, H. Miyata26, D. Mohapatra47, T. Mori41, T. Nagamine39, Y. Nagasaka7, T. T. Nakamura6, E. Nakano27, M. Nakao6, H. Nakazawa6, Z. Natkaniec24, S. Nishida6, O. Nitoh43, S. Ogawa37, Y. Ogawa6, K. Ohmi6, Y. Ohnishi6, T. Ohshima19, N. Ohuchi6, T. Okabe19, S. Okuno12, W. Ostrowicz24, H. Ozaki6, H. Palka24, C. W. Park13, H. Park14, N. Parslow35, L. E. Piilonen47, N. Root1, H. Sagawa6, S. Saitoh6, Y. Sakai6, M. Satapathy46, A. Satpathy6,3, O. Schneider15, J. Schümann23, A. J. Schwartz3, S. Semenov10, K. Senyo19, R. Seuster5, M. E. Sevior18, H. Shibuya37, T. Shidara6, B. Shwartz1, V. Sidorov1, J. B. Singh29, N. Soni29, S. Stanič45,*, M. Starič11, A. Sugi19, K. Sumisawa28, T. Sumiyoshi42, S. Suzuki48, S. Y. Suzuki6, F. Takasaki6, K. Tamai6, N. Tamura26, M. Tanaka6, M. Tawada6, G. N. Taylor18, Y. Teramoto27, T. Tomura40, T. Tsuboyama6, T. Tsukamoto6, S. Uehara6, K. Ueno23, S. Uno6, G. Varner5, C. C. Wang23, C. H. Wang22, J. G. Wang47, Y. Watanabe41, E. Won13, B. D. Yabsley47, Y. Yamada6, A. Yamaguchi39, Y. Yamashita25, M. Yamauchi6, H. Yanai26, Heyoung Yang33, M. Yoshida6, Y. Yusa39, Z. P. Zhang32, Y. Zheng5, V. Zhilich1, and D. Žontar16,11 (Belle Collaboration)
1Budker Institute of Nuclear Physics, Novosibirsk
2Chiba University, Chiba
3University of Cincinnati, Cincinnati, Ohio 45221
4Gyeongsang National University, Chinju
5University of Hawaii, Honolulu, Hawaii 96822
6High Energy Accelerator Research Organization (KEK), Tsukuba
7Hiroshima Institute of Technology, Hiroshima
8Institute of High Energy Physics, Chinese Academy of Sciences, Beijing
9Institute of High Energy Physics, Vienna
10Institute for Theoretical and Experimental Physics, Moscow
11J. Stefan Institute, Ljubljana
12Kanagawa University, Yokohama
13Korea University, Seoul
14Kyungpook National University, Taegu
15Institut de Physique des Hautes Énergies, Université de Lausanne, Lausanne
16University of Ljubljana, Ljubljana
17University of Maribor, Maribor
18University of Melbourne, Victoria
19Nagoya University, Nagoya
20Nara Women’s University, Nara
21National Kaohsiung Normal University, Kaohsiung
22National Lien-Ho Institute of Technology, Miao Li
23Department of Physics, National Taiwan University, Taipei
24H. Niewodniczanski Institute of Nuclear Physics, Krakow
25Nihon Dental College, Niigata
26Niigata University, Niigata
27Osaka City University, Osaka
28Osaka University, Osaka
29Panjab University, Chandigarh
30Peking University, Beijing
31Princeton University, Princeton, New Jersey 08545
32University of Science and Technology of China, Hefei
33Seoul National University, Seoul
34Sungkyunkwan University, Suwon
35University of Sydney, Sydney, New South Wales
36Tata Institute of Fundamental Research, Bombay
37Toho University, Funabashi
38Tohoku Gakuin University, Tagajo
39Tohoku University, Sendai
40Department of Physics, University of Tokyo, Tokyo
41Tokyo Institute of Technology, Tokyo
42Tokyo Metropolitan University, Tokyo
43Tokyo University of Agriculture and Technology, Tokyo
44Toyama National College of Maritime Technology, Toyama
45University of Tsukuba, Tsukuba
46Utkal University, Bhubaneswer
47Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
48Yokkaichi University, Yokkaichi
49Yonsei University, Seoul
Received 14 October 2003; published 29 April 2004
We have performed a search for the lepton-flavor-violating decay τ→μγ using a data sample of 86.3 fb-1 accumulated by the Belle detector at KEK. No evidence for a signal is seen, and we set an upper limit for the branching fraction of B(τ→μγ)<3.1×10-7 at the 90% confidence level.
© 2004 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.171802
DOI:
10.1103/PhysRevLett.92.171802
PACS:
13.35.Dx, 11.30.Fs, 14.60.Fg
*On leave from Nova Gorica Polytechnic, Nova Gorica.
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