Phys. Rev. Lett.
87,
091802
(2001)
[7 pages]
Observation of Large CP Violation in the Neutral B Meson System
K. Abe et al. (Belle Collaboration)
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K. Abe9, K. Abe37, R. Abe27, I. Adachi9, Byoung Sup Ahn16, H. Aihara39, M. Akatsu20, G. Alimonti8, K. Asai21, M. Asai10, Y. Asano44, T. Aso43, V. Aulchenko2, T. Aushev14, A. M. Bakich35, E. Banas25, S. Behari9, P. K. Behera45, D. Beiline2, A. Bondar2, A. Bozek25, T. E. Browder8, B. C. K. Casey8, P. Chang24, Y. Chao24, K.-F. Chen24, B. G. Cheon34, R. Chistov14, S.-K. Choi7, Y. Choi34, L. Y. Dong12, J. Dragic19, A. Drutskoy14, S. Eidelman2, V. Eiges14, Y. Enari20, R. Enomoto9, C. W. Everton19, F. Fang8, H. Fujii9, C. Fukunaga41, M. Fukushima11, N. Gabyshev9, A. Garmash2,9, T. J. Gershon9, A. Gordon19, K. Gotow46, H. Guler8, R. Guo22, J. Haba9, H. Hamasaki9, K. Hanagaki31, F. Handa38, K. Hara29, T. Hara29, N. C. Hastings19, H. Hayashii21, M. Hazumi29, E. M. Heenan19, Y. Higasino20, I. Higuchi38, T. Higuchi39, T. Hirai40, H. Hirano42, T. Hojo29, T. Hokuue20, Y. Hoshi37, K. Hoshina42, S. R. Hou24, W.-S. Hou24, S.-C. Hsu24, H.-C. Huang24, Y. Igarashi9, T. Iijima9, H. Ikeda9, K. Ikeda21, K. Inami20, A. Ishikawa20, H. Ishino40, R. Itoh9, G. Iwai27, H. Iwasaki9, Y. Iwasaki9, D. J. Jackson29, P. Jalocha25, H. K. Jang33, M. Jones8, R. Kagan14, H. Kakuno40, J. Kaneko40, J. H. Kang48, J. S. Kang16, P. Kapusta25, N. Katayama9, H. Kawai3, H. Kawai39, Y. Kawakami20, N. Kawamura1, T. Kawasaki27, H. Kichimi9, D. W. Kim34, Heejong Kim48, H. J. Kim48, Hyunwoo Kim16, S. K. Kim33, T. H. Kim48, K. Kinoshita5, S. Kobayashi32, S. Koishi40, H. Konishi42, K. Korotushenko31, P. Krokovny2, R. Kulasiri5, S. Kumar30, T. Kuniya32, E. Kurihara3, A. Kuzmin2, Y.-J. Kwon48, J. S. Lange6, G. Leder13, M. H. Lee9, S. H. Lee33, C. Leonidopoulos31, Y.-S. Lin24, D. Liventsev14, R.-S. Lu24, J. MacNaughton13, D. Marlow31, T. Matsubara39, S. Matsui20, S. Matsumoto4, T. Matsumoto20, Y. Mikami38, K. Misono20, K. Miyabayashi21, H. Miyake29, H. Miyata27, L. C. Moffitt19, G. R. Moloney19, G. F. Moorhead19, S. Mori44, T. Mori4, A. Murakami32, T. Nagamine38, Y. Nagasaka10, Y. Nagashima29, T. Nakadaira39, T. Nakamura40, E. Nakano28, M. Nakao9, H. Nakazawa4, J. W. Nam34, Z. Natkaniec25, K. Neichi37, S. Nishida17, O. Nitoh42, S. Noguchi21, T. Nozaki9, S. Ogawa36, T. Ohshima20, Y. Ohshima40, T. Okabe20, T. Okazaki21, S. Okuno15, S. L. Olsen8, H. Ozaki9, P. Pakhlov14, H. Palka25, C. S. Park33, C. W. Park16, H. Park18, L. S. Peak35, M. Peters8, L. E. Piilonen46, E. Prebys31, J. L. Rodriguez8, N. Root2, M. Rozanska25, K. Rybicki25, J. Ryuko29, H. Sagawa9, Y. Sakai9, H. Sakamoto17, M. Satapathy45, A. Satpathy9,5, S. Schrenk5, S. Semenov14, K. Senyo20, Y. Settai4, M. E. Sevior19, H. Shibuya36, B. Shwartz2, A. Sidorov2, S. Stanič44, A. Sugi20, A. Sugiyama20, K. Sumisawa9, T. Sumiyoshi9, J.-I. Suzuki9, K. Suzuki3, S. Suzuki47, S. Y. Suzuki9, S. K. Swain8, H. Tajima39, T. Takahashi28, F. Takasaki9, M. Takita29, K. Tamai9, N. Tamura27, J. Tanaka39, M. Tanaka9, G. N. Taylor19, Y. Teramoto28, M. Tomoto9, T. Tomura39, S. N. Tovey19, K. Trabelsi8, T. Tsuboyama9, T. Tsukamoto9, S. Uehara9, K. Ueno24, Y. Unno3, S. Uno9, Y. Ushiroda9, S. E. Vahsen31, K. E. Varvell35, C. C. Wang24, C. H. Wang23, J. G. Wang46, M.-Z. Wang24, Y. Watanabe40, E. Won33, B. D. Yabsley9, Y. Yamada9, M. Yamaga38, A. Yamaguchi38, H. Yamamoto8, T. Yamanaka29, Y. Yamashita26, M. Yamauchi9, S. Yanaka40, J. Yashima9, M. Yokoyama39, K. Yoshida20, Y. Yusa38, H. Yuta1, C. C. Zhang12, J. Zhang44, H. W. Zhao9, Y. Zheng8, V. Zhilich2, and D. Žontar44 (Belle Collaboration)
1Aomori University, Aomori
2Budker Institute of Nuclear Physics, Novosibirsk
3Chiba University, Chiba
4Chuo University, Tokyo
5University of Cincinnati, Cincinnati, Ohio
6University of Frankfurt, Frankfurt
7Gyeongsang National University, Chinju
8University of Hawaii, Honolulu, Hawaii
9High Energy Accelerator Research Organization (KEK), Tsukuba
10Hiroshima Institute of Technology, Hiroshima
11Institute for Cosmic Ray Research, University of Tokyo, Tokyo
12Institute of High Energy Physics, Chinese Academy of Sciences, Beijing
13Institute of High Energy Physics, Vienna
14Institute for Theoretical and Experimental Physics, Moscow
15Kanagawa University, Yokohama
16Korea University, Seoul
17Kyoto University, Kyoto
18Kyungpook National University, Taegu
19University of Melbourne, Victoria
20Nagoya University, Nagoya
21Nara Women's University, Nara
22National Kaohsiung Normal University, Kaohsiung
23National Lien-Ho Institute of Technology, Miao Li
24National 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
31Princeton University, Princeton, New Jersey
32Saga University, Saga
33Seoul National University, Seoul
34Sungkyunkwan University, Suwon
35University of Sydney, Sydney, New South Wales
36Toho University, Funabashi
37Tohoku Gakuin University, Tagajo
38Tohoku University, Sendai
39University of Tokyo, Tokyo
40Tokyo Institute of Technology, Tokyo
41Tokyo Metropolitan University, Tokyo
42Tokyo University of Agriculture and Technology, Tokyo
43Toyama National College of Maritime Technology, Toyama
44University of Tsukuba, Tsukuba
45Utkal University, Bhubaneswer
46Virginia Polytechnic Institute and State University, Blacksburg, Virginia
47Yokkaichi University, Yokkaichi
48Yonsei University, Seoul
Received 18 July 2001; published 14 August 2001
We present a measurement of the standard model CP violation parameter sin2φ1 based on a 29.1fb-1 data sample collected at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. One neutral B meson is fully reconstructed as a J/ψKS, ψ(2S)KS, χc1KS, ηcKS, J/ψKL, or J/ψK*0 decay and the flavor of the accompanying B meson is identified from its decay products. From the asymmetry in the distribution of the time intervals between the two B meson decay points, we determine sin2φ1 = 0.99±0.14(stat)±0.06(syst). We conclude that we have observed CP violation in the neutral B meson system.
© 2001 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.87.091802
DOI:
10.1103/PhysRevLett.87.091802
PACS:
13.25.Hw, 11.30.Er, 12.15.Hh
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