Phys. Rev. Lett.
100,
121801
(2008)
[6 pages]
Observation of Bs0→φγ and Search for Bs0→γγ Decays at Belle
J. Wicht et al. Belle Collaboration
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J. Wicht17, I. Adachi8, H. Aihara40, K. Arinstein1, V. Aulchenko1, T. Aushev17,12, A. M. Bakich37, V. Balagura12, A. Bay17, K. Belous11, V. Bhardwaj32, U. Bitenc13, A. Bondar1, A. Bozek26, M. Bračko19,13, T. E. Browder7, P. Chang25, Y. Chao25, A. Chen23, K.-F. Chen25, W. T. Chen23, B. G. Cheon6, R. Chistov12, I.-S. Cho45, Y. Choi36, J. Dalseno20, M. Dash44, A. Drutskoy3, S. Eidelman1, N. Gabyshev1, P. Goldenzweig3, B. Golob18,13, J. Haba8, K. Hayasaka21, M. Hazumi8, D. Heffernan31, Y. Hoshi39, W.-S. Hou25, Y. B. Hsiung25, H. J. Hyun16, T. Iijima21, K. Inami21, A. Ishikawa33, H. Ishino41, R. Itoh8, Y. Iwasaki8, D. H. Kah16, H. Kaji21, J. H. Kang45, P. Kapusta26, H. Kawai2, T. Kawasaki28, H. Kichimi8, H. J. Kim16, H. O. Kim16, S. K. Kim35, Y. J. Kim5, K. Kinoshita3, S. Korpar19,13, P. Križan18,13, R. Kumar32, C. C. Kuo23, Y.-J. Kwon45, J. S. Lange4, J. Lee35, J. S. Lee36, S. E. Lee35, T. Lesiak26, A. Limosani20, S.-W. Lin25, Y. Liu5, D. Liventsev12, F. Mandl10, S. McOnie37, T. Medvedeva12, W. Mitaroff10, K. Miyabayashi22, H. Miyake31, H. Miyata28, Y. Miyazaki21, R. Mizuk12, D. Mohapatra44, G. R. Moloney20, M. Nakao8, Z. Natkaniec26, S. Nishida8, O. Nitoh43, T. Nozaki8, S. Ogawa38, T. Ohshima21, S. Okuno14, H. Ozaki8, P. Pakhlov12, G. Pakhlova12, H. Palka26, C. W. Park36, H. Park16, K. S. Park36, R. Pestotnik13, L. E. Piilonen44, Y. Sakai8, O. Schneider17, J. Schümann8, A. J. Schwartz3, K. Senyo21, M. E. Sevior20, M. Shapkin11, H. Shibuya38, J.-G. Shiu25, B. Shwartz1, J. B. Singh32, A. Somov3, S. Stanič29, M. Starič13, K. Sumisawa8, T. Sumiyoshi42, F. Takasaki8, K. Tamai8, M. Tanaka8, G. N. Taylor20, Y. Teramoto30, K. Trabelsi8, T. Tsuboyama8, S. Uehara8, K. Ueno25, Y. Unno6, S. Uno8, Y. Ushiroda8, Y. Usov1, G. Varner7, K. Vervink17, S. Villa17, C. H. Wang24, P. Wang9, X. L. Wang9, Y. Watanabe14, E. Won15, B. D. Yabsley37, Y. Yamashita27, M. Yamauchi8, Y. Yusa44, Z. P. Zhang34, V. Zhilich1, A. Zupanc13, and N. Zwahlen17 (Belle Collaboration)
1Budker Institute of Nuclear Physics, Novosibirsk
2Chiba University, Chiba
3University of Cincinnati, Cincinnati, Ohio 45221
4Justus-Liebig-Universität Gießen, Gießen
5The Graduate University for Advanced Studies, Hayama
6Hanyang University, Seoul
7University of Hawaii, Honolulu, Hawaii 96822
8High Energy Accelerator Research Organization (KEK), Tsukuba
9Institute of High Energy Physics, Chinese Academy of Sciences, Beijing
10Institute of High Energy Physics, Vienna
11Institute of High Energy Physics, Protvino
12Institute for Theoretical and Experimental Physics, Moscow
13J. Stefan Institute, Ljubljana
14Kanagawa University, Yokohama
15Korea University, Seoul
16Kyungpook National University, Taegu
17École Polytechnique Fédérale de Lausanne (EPFL), Lausanne
18Faculty of Mathematics and Physics, University of Ljubljana, Ljubljana
19University of Maribor, Maribor
20University of Melbourne, School of Physics, Victoria 3010
21Nagoya University, Nagoya
22Nara Women’s University, Nara
23National Central University, Chung-li
24National United University, Miao Li
25Department of Physics, National Taiwan University, Taipei
26H. Niewodniczanski Institute of Nuclear Physics, Krakow
27Nippon Dental University, Niigata
28Niigata University, Niigata
29University of Nova Gorica, Nova Gorica
30Osaka City University, Osaka
31Osaka University, Osaka
32Panjab University, Chandigarh
33Saga University, Saga
34University of Science and Technology of China, Hefei
35Seoul National University, Seoul
36Sungkyunkwan University, Suwon
37University of Sydney, Sydney, New South Wales
38Toho University, Funabashi
39Tohoku Gakuin University, Tagajo
40Department of Physics, University of Tokyo, Tokyo
41Tokyo Institute of Technology, Tokyo
42Tokyo Metropolitan University, Tokyo
43Tokyo University of Agriculture and Technology, Tokyo
44Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
45Yonsei University, Seoul
Received 17 December 2007; published 26 March 2008
We search for the radiative penguin decays Bs0→ϕγ and Bs0→γγ in a 23.6 fb-1 data sample collected at the Υ(5S) resonance with the Belle detector at the KEKB e+e- asymmetric-energy collider. We observe for the first time a radiative penguin decay of the Bs0 meson in the Bs0→ϕγ mode and we measure B(Bs0→ϕγ)=(57-15+18(stat)-11+12(syst))×10-6. No significant Bs0→γγ signal is observed and we set a 90% confidence level upper limit of B(Bs0→γγ)<8.7×10-6.
© 2008 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.121801
DOI:
10.1103/PhysRevLett.100.121801
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