Phys. Rev. Lett.
93,
031803
(2004)
[6 pages]
Measurement of the CP Asymmetry in B→Xsγ
S. Nishida et al. Belle Collaboration
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S. Nishida8, K. Abe8, K. Abe41, T. Abe8, H. Aihara43, Y. Asano47, T. Aushev12, S. Bahinipati4, A. M. Bakich38, Y. Ban31, E. Banas25, A. Bay17, U. Bitenc13, I. Bizjak13, S. Blyth24, A. Bondar1, A. Bozek25, M. Bračko19,13, J. Brodzicka25, T. E. Browder7, M.-C. Chang24, P. Chang24, K.-F. Chen24, B. G. Cheon3, R. Chistov12, S.-K. Choi6, Y. Choi37, A. Chuvikov32, S. Cole38, M. Danilov12, M. Dash48, L. Y. Dong10, J. Dragic20, S. Eidelman1, V. Eiges12, Y. Enari21, D. Epifanov1, F. Fang7, S. Fratina13, A. Garmash32, T. Gershon8, G. Gokhroo39, B. Golob18,13, J. Haba8, T. Hara29, N. C. Hastings8, H. Hayashii22, M. Hazumi8, T. Higuchi8, L. Hinz17, Y. Hoshi41, W.-S. Hou24, Y. B. Hsiung24,*, T. Iijima21, K. Inami21, A. Ishikawa8, H. Ishino44, R. Itoh8, M. Iwasaki43, Y. Iwasaki8, J. H. Kang50, J. S. Kang15, P. Kapusta25, S. U. Kataoka22, N. Katayama8, T. Kawasaki27, H. Kichimi8, H. J. Kim16, S. K. Kim36, T. H. Kim50, P. Koppenburg8, S. Korpar19,13, P. Križan18,13, P. Krokovny1, A. Kuzmin1, Y.-J. Kwon50, J. S. Lange5,33, G. Leder11, S. E. Lee36, S. H. Lee36, J. Li35, S.-W. Lin24, J. MacNaughton11, G. Majumder39, F. Mandl11, T. Matsumoto45, A. Matyja25, W. Mitaroff11, H. Miyake29, R. Mizuk12, D. Mohapatra48, G. R. Moloney20, A. Murakami34, T. Nagamine42, Y. Nagasaka9, E. Nakano28, M. Nakao8, H. Nakazawa8, Z. Natkaniec25, O. Nitoh46, T. Nozaki8, S. Ogawa40, T. Ohshima21, T. Okabe21, S. Okuno14, S. L. Olsen7, H. Ozaki8, P. Pakhlov12, H. Palka25, C. W. Park15, H. Park16, M. Peters7, L. E. Piilonen48, F. J. Ronga8, M. Rozanska25, Y. Sakai8, O. Schneider17, J. Schümann24, C. Schwanda11, S. Semenov12, R. Seuster7, M. E. Sevior20, H. Shibuya40, B. Shwartz1, A. Somov4, N. Soni30, R. Stamen8, S. Stanič47,†, M. Starič13, A. Sugiyama34, T. Sumiyoshi45, S. Suzuki49, O. Tajima42, F. Takasaki8, K. Tamai8, M. Tanaka8, Y. Teramoto28, T. Tomura43, K. Trabelsi7, T. Tsuboyama8, T. Tsukamoto8, S. Uehara8, T. Uglov12, K. Ueno24, Y. Unno2, S. Uno8, Y. Ushiroda8, G. Varner7, K. E. Varvell38, C. H. Wang23, M.-Z. Wang24, Y. Watanabe44, B. D. Yabsley48, Y. Yamada8, A. Yamaguchi42, Y. Yamashita26, M. Yamauchi8, Heyoung Yang36, J. Ying31, Z. P. Zhang35, V. Zhilich1, T. Ziegler32, D. Žontar18,13, and D. Zürcher17 (Belle Collaboration)
1Budker Institute of Nuclear Physics, Novosibirsk
2Chiba University, Chiba
3Chonnam National University, Kwangju
4University of Cincinnati, Cincinnati, Ohio 45221
5University of Frankfurt, Frankfurt
6Gyeongsang National University, Chinju
7University of Hawaii, Honolulu, Hawaii 96822
8High Energy Accelerator Research Organization (KEK), Tsukuba
9Hiroshima Institute of Technology, Hiroshima
10Institute of High Energy Physics, Chinese Academy of Sciences, Beijing
11Institute of High Energy Physics, Vienna
12Institute for Theoretical and Experimental Physics, Moscow
13J. Stefan Institute, Ljubljana
14Kanagawa University, Yokohama
15Korea University, Seoul
16Kyungpook National University, Taegu
17Swiss Federal Institute of Technology of Lausanne, EPFL, Lausanne
18University of Ljubljana, Ljubljana
19University of Maribor, Maribor
20University of Melbourne, Victoria
21Nagoya University, Nagoya
22Nara Women’s University, Nara
23National United University, Miao Li
24Department of Physics, National Taiwan University, Taipei
25H. Niewodniczanski Institute of Nuclear Physics, Krakow
26Nihon Dental College, Niigata
27Niigata University, Niigata
28Osaka City University, Osaka
29Osaka University, Osaka
30Panjab University, Chandigarh
31Peking University, Beijing
32Princeton University, Princeton, New Jersey 08545
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, New South Wales
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
49Yokkaichi University, Yokkaichi
50Yonsei University, Seoul
Received 4 April 2004; published 16 July 2004
Direct CP violation in the b→sγ process is a sensitive probe of physics beyond the standard model. We report a measurement of the CP asymmetry in B→Xsγ, where the hadronic recoil system Xs is reconstructed using a pseudoreconstruction technique. In this approach there is negligible contamination from b→dγ decays, which are expected to have a much larger CP asymmetry. We find ACP=0.002±0.050(stat)±0.030(syst) for B→Xsγ events having recoil mass smaller than 2.1 GeV/c2. The analysis is based on a data sample of 140 fb-1 recorded at the ϒ(4S) resonance with the Belle detector at the KEKB e+e- storage ring.
© 2004 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.031803
DOI:
10.1103/PhysRevLett.93.031803
PACS:
13.20.He, 11.30.Er, 14.40.Nd
*On leave from Fermi National Accelerator Laboratory, Batavia, IL 60510. †On leave from Nova Gorica Polytechnic, Nova Gorica.
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