Phys. Rev. Lett.
98,
031802
(2007)
[6 pages]
Observation of Time-Dependent CP Violation in B0→η′K0 Decays and Improved Measurements of CP Asymmetries in B0→φK0, KS0KS0KS0 and B0→J/ψK0 Decays
K.-F. Chen et al. Belle Collaboration
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K.-F. Chen27, K. Hara23, M. Hazumi8, T. Higuchi8, K. Miyabayashi24, Y. Nakahama48, K. Sumisawa8, O. Tajima8, Y. Ushiroda8, Y. Yusa52, K. Abe8, K. Abe46, I. Adachi8, H. Aihara48, D. Anipko1, K. Arinstein1, V. Aulchenko1, T. Aushev19,14, T. Aziz44, A. M. Bakich43, V. Balagura14, S. Banerjee44, E. Barberio22, M. Barbero7, A. Bay19, K. Belous13, U. Bitenc15, I. Bizjak15, S. Blyth25, A. Bondar1, A. Bozek28, M. Bračko8,21,15, J. Brodzicka28, T. E. Browder7, P. Chang27, Y. Chao27, A. Chen25, W. T. Chen25, B. G. Cheon3, R. Chistov14, S.-K. Choi6, Y. Choi42, Y. K. Choi42, A. Chuvikov36, S. Cole43, J. Dalseno22, M. Danilov14, M. Dash52, J. Dragic8, A. Drutskoy4, S. Eidelman1, D. Epifanov1, S. Fratina15, A. Garmash36, T. Gershon8, A. Go25, G. Gokhroo44, P. Goldenzweig4, B. Golob20,15, H. Ha17, J. Haba8, T. Hara33, K. Hayasaka23, H. Hayashii24, D. Heffernan33, T. Hokuue23, Y. Hoshi46, S. Hou25, W.-S. Hou27, Y. B. Hsiung27, T. Iijima23, K. Ikado23, A. Imoto24, K. Inami23, A. Ishikawa48, H. Ishino49, R. Itoh8, M. Iwasaki48, Y. Iwasaki8, H. Kakuno48, J. H. Kang53, S. U. Kataoka24, N. Katayama8, H. Kawai2, T. Kawasaki30, H. R. Khan49, H. Kichimi8, H. J. Kim18, S. K. Kim40, Y. J. Kim5, K. Kinoshita4, S. Korpar21,15, P. Križan20,15, P. Krokovny8, R. Kulasiri4, R. Kumar34, C. C. Kuo25, A. Kusaka48, A. Kuzmin1, Y.-J. Kwon53, G. Leder12, J. Lee40, M. J. Lee40, T. Lesiak28, J. Li7, A. Limosani8, S.-W. Lin27, Y. Liu5, D. Liventsev14, G. Majumder44, F. Mandl12, T. Matsumoto50, A. Matyja28, W. Mitaroff12, H. Miyake33, H. Miyata30, Y. Miyazaki23, R. Mizuk14, D. Mohapatra52, G. R. Moloney22, A. Murakami38, T. Nagamine47, Y. Nagasaka9, I. Nakamura8, E. Nakano32, M. Nakao8, Z. Natkaniec28, S. Nishida8, O. Nitoh51, S. Noguchi24, T. Nozaki8, S. Ogawa45, T. Ohshima23, S. Okuno16, S. L. Olsen7, Y. Onuki37, W. Ostrowicz28, H. Ozaki8, P. Pakhlov14, G. Pakhlova14, H. Palka28, H. Park18, R. Pestotnik15, L. E. Piilonen52, H. Sahoo7, Y. Sakai8, N. Satoyama41, T. Schietinger19, O. Schneider19, J. Schümann26, A. J. Schwartz4, R. Seidl10,37, K. Senyo23, M. E. Sevior22, M. Shapkin13, H. Shibuya45, B. Shwartz1, J. B. Singh34, A. Sokolov13, A. Somov4, S. Stanič31, M. Starič15, H. Stoeck43, T. Sumiyoshi50, S. Suzuki38, F. Takasaki8, K. Tamai8, N. Tamura30, M. Tanaka8, G. N. Taylor22, Y. Teramoto32, X. C. Tian35, K. Trabelsi7, T. Tsuboyama8, T. Tsukamoto8, S. Uehara8, T. Uglov14, K. Ueno27, Y. Unno3, S. Uno8, P. Urquijo22, Y. Usov1, G. Varner7, K. E. Varvell43, S. Villa19, C. C. Wang27, C. H. Wang26, M.-Z. Wang27, Y. Watanabe49, R. Wedd22, E. Won17, Q. L. Xie11, B. D. Yabsley43, A. Yamaguchi47, Y. Yamashita29, M. Yamauchi8, C. C. Zhang11, Z. P. Zhang39, V. Zhilich1, and A. Zupanc15 (Belle Collaboration)
1Budker Institute of Nuclear Physics, Novosibirsk
2Chiba University, Chiba
3Chonnam National University, Kwangju
4University of Cincinnati, Cincinnati, Ohio 45221
5The Graduate University for Advanced Studies, Hayama, Japan
6Gyeongsang National University, Chinju
7University of Hawaii, Honolulu, Hawaii 96822
8High Energy Accelerator Research Organization (KEK), Tsukuba
9Hiroshima Institute of Technology, Hiroshima
10University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
11Institute of High Energy Physics, Chinese Academy of Sciences, Beijing
12Institute of High Energy Physics, Vienna
13Institute of High Energy Physics, Protvino
14Institute for Theoretical and Experimental Physics, Moscow
15J. Stefan Institute, Ljubljana
16Kanagawa University, Yokohama
17Korea University, Seoul
18Kyungpook National University, Taegu
19Swiss Federal Institute of Technology of Lausanne, EPFL, Lausanne
20University of Ljubljana, Ljubljana
21University of Maribor, Maribor
22University of Melbourne, Victoria
23Nagoya University, Nagoya
24Nara Women’s University, Nara
25National Central University, Chung-li
26National United University, Miao Li
27Department of Physics, National Taiwan University, Taipei
28H. Niewodniczanski Institute of Nuclear Physics, Krakow
29Nippon Dental University, Niigata
30Niigata University, Niigata
31University of Nova Gorica, Nova Gorica
32Osaka City University, Osaka
33Osaka University, Osaka
34Panjab University, Chandigarh
35Peking University, Beijing
36Princeton University, Princeton, New Jersey 08544
37RIKEN BNL Research Center, Upton, New York 11973
38Saga University, Saga
39University of Science and Technology of China, Hefei
40Seoul National University, Seoul
41Shinshu University, Nagano
42Sungkyunkwan University, Suwon
43University of Sydney, Sydney NSW
44Tata Institute of Fundamental Research, Bombay
45Toho University, Funabashi
46Tohoku Gakuin University, Tagajo
47Tohoku University, Sendai
48Department of Physics, University of Tokyo, Tokyo
49Tokyo Institute of Technology, Tokyo
50Tokyo Metropolitan University, Tokyo
51Tokyo University of Agriculture and Technology, Tokyo
52Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
53Yonsei University, Seoul
Received 2 October 2006; published 16 January 2007
We present improved measurements of CP-violation parameters in B0→ϕK0, η′K0, KS0KS0KS0 decays based on a sample of 535×106 BB̅ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB energy-asymmetric e+e- collider. We obtain sin2ϕ1eff=+0.64±0.10(stat)±0.04(syst) for B0→η′K0, +0.50±0.21(stat)±0.06(syst) for B0→ϕK0, and +0.30±0.32(stat)±0.08(syst) for B0→KS0KS0KS0 decays. We have observed CP violation in the B0→η′K0 decay with a significance of 5.6 standard deviations. We also perform an improved measurement of CP asymmetries in B0→J/ψK0 decays and obtain sin2ϕ1=+0.642±0.031(stat)±0.017(syst).
© 2007 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.031802
DOI:
10.1103/PhysRevLett.98.031802
PACS:
13.25.Hw, 11.30.Er, 12.15.Hh
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