Phys. Rev. Lett.
93,
191802
(2004)
[6 pages]
Evidence for Direct CP Violation in B0→K+π-Decays
Y. Chao et al. Belle Collaboration
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Y. Chao29, P. Chang29, K. Abe10, K. Abe46, N. Abe49, I. Adachi10, H. Aihara48, K. Akai10, M. Akatsu24, M. Akemoto10, Y. Asano53, T. Aso52, V. Aulchenko2, T. Aushev14, T. Aziz44, S. Bahinipati6, A. M. Bakich43, Y. Ban36, M. Barbero9, A. Bay20, I. Bedny2, U. Bitenc15, I. Bizjak15, S. Blyth29, A. Bondar2, A. Bozek30, M. Bračko22,15, J. Brodzicka30, T. E. Browder9, M.-C. Chang29, A. Chen26, K.-F. Chen29, W. T. Chen26, B. G. Cheon4, R. Chistov14, S.-K. Choi8, Y. Choi42, Y. K. Choi42, A. Chuvikov37, S. Cole43, M. Danilov14, M. Dash55, L. Y. Dong12, R. Dowd23, J. Dragic23, A. Drutskoy6, S. Eidelman2, V. Eiges14, Y. Enari24, D. Epifanov2, C. W. Everton23, F. Fang9, J. Flanagan10, S. Fratina15, H. Fujii10, Y. Funakoshi10, K. Furukawa10, N. Gabyshev2, A. Garmash37, T. Gershon10, A. Go26, G. Gokhroo44, B. Golob21,15, M. Grosse Perdekamp38, H. Guler9, R. Guo27, J. Haba10, C. Hagner55, F. Handa47, K. Hara34, T. Hara34, N. C. Hastings10, K. Hasuko38, K. Hayasaka24, H. Hayashii25, M. Hazumi10, E. M. Heenan23, I. Higuchi47, T. Higuchi10, L. Hinz20, T. Hojo34, T. Hokuue24, Y. Hoshi46, K. Hoshina51, S. Hou26, W.-S. Hou29, Y. B. Hsiung29, H.-C. Huang29, T. Igaki24, Y. Igarashi10, T. Iijima24, H. Ikeda10, A. Imoto25, K. Inami24, A. Ishikawa10, H. Ishino49, K. Itoh48, R. Itoh10, M. Iwamoto3, M. Iwasaki48, Y. Iwasaki10, R. Kagan14, H. Kakuno48, T. Kamitani10, J. H. Kang56, J. S. Kang17, P. Kapusta30, S. U. Kataoka25, N. Katayama10, H. Kawai3, H. Kawai48, Y. Kawakami24, N. Kawamura1, T. Kawasaki32, N. Kent9, H. R. Khan49, A. Kibayashi49, H. Kichimi10, M. Kikuchi10, E. Kikutani10, H. J. Kim19, H. O. Kim42, Hyunwoo Kim17, J. H. Kim42, S. K. Kim41, T. H. Kim56, K. Kinoshita6, S. Kobayashi39, H. Koiso10, P. Koppenburg10, S. Korpar22,15, P. Križan21,15, P. Krokovny2, T. Kubo10, R. Kulasiri6, S. Kumar35, C. C. Kuo26, H. Kurashiro49, E. Kurihara3, A. Kusaka48, A. Kuzmin2, Y.-J. Kwon56, J. S. Lange7, G. Leder13, S. E. Lee41, S. H. Lee41, Y.-J. Lee29, T. Lesiak30, J. Li40, A. Limosani23, S.-W. Lin29, D. Liventsev14, J. MacNaughton13, G. Majumder44, F. Mandl13, D. Marlow37, M. Masuzawa10, T. Matsuishi24, H. Matsumoto32, S. Matsumoto5, T. Matsumoto50, A. Matyja30, S. Michizono10, Y. Mikami47, T. Mimashi10, W. Mitaroff13, K. Miyabayashi25, Y. Miyabayashi24, H. Miyake34, H. Miyata32, R. Mizuk14, D. Mohapatra55, G. R. Moloney23, G. F. Moorhead23, T. Mori49, J. Mueller10, A. Murakami39, T. Nagamine47, Y. Nagasaka11, T. Nakadaira48, I. Nakamura10, T. T. Nakamura10, E. Nakano33, M. Nakao10, H. Nakayama10, H. Nakazawa10, Z. Natkaniec30, K. Neichi46, S. Nishida10, O. Nitoh51, S. Noguchi25, T. Nozaki10, A. Ogawa38, S. Ogawa45, Y. Ogawa10, K. Ohmi10, Y. Ohnishi10, T. Ohshima24, N. Ohuchi10, K. Oide10, T. Okabe24, S. Okuno16, S. L. Olsen9, Y. Onuki32, W. Ostrowicz30, H. Ozaki10, P. Pakhlov14, H. Palka30, C. W. Park42, H. Park19, K. S. Park42, N. Parslow43, L. S. Peak43, M. Pernicka13, J.-P. Perroud20, M. Peters9, L. E. Piilonen55, A. Poluektov2, F. J. Ronga10, N. Root2, M. Rozanska30, H. Sagawa10, M. Saigo47, S. Saitoh10, Y. Sakai10, H. Sakamoto18, H. Sakaue33, T. R. Sarangi10, M. Satapathy54, N. Sato24, T. Schietinger20, O. Schneider20, J. Schümann29, C. Schwanda13, A. J. Schwartz6, T. Seki50, S. Semenov14, K. Senyo24, Y. Settai5, R. Seuster9, M. E. Sevior23, T. Shibata32, H. Shibuya45, T. Shidara10, B. Shwartz2, V. Sidorov2, V. Siegle38, J. B. Singh35, A. Somov6, N. Soni35, R. Stamen10, S. Stanič53,*, M. Starič15, R. Sugahara10, A. Sugi24, T. Sugimura10, A. Sugiyama39, K. Sumisawa34, T. Sumiyoshi50, S. Suzuki39, S. Y. Suzuki10, S. K. Swain9, O. Tajima10, F. Takasaki10, K. Tamai10, N. Tamura32, K. Tanabe48, M. Tanaka10, M. Tawada10, G. N. Taylor23, Y. Teramoto33, X. C. Tian36, S. Tokuda24, S. N. Tovey23, K. Trabelsi9, T. Tsuboyama10, T. Tsukamoto10, K. Uchida9, S. Uehara10, T. Uglov14, K. Ueno29, Y. Unno3, S. Uno10, Y. Ushiroda10, G. Varner9, K. E. Varvell43, S. Villa20, C. C. Wang29, C. H. Wang28, J. G. Wang55, M.-Z. Wang29, M. Watanabe32, Y. Watanabe49, L. Widhalm13, Q. L. Xie12, B. D. Yabsley55, A. Yamaguchi47, H. Yamamoto47, N. Yamamoto10, S. Yamamoto50, T. Yamanaka34, Y. Yamashita31, M. Yamauchi10, Heyoung Yang41, P. Yeh29, J. Ying36, K. Yoshida24, M. Yoshida10, Y. Yuan12, Y. Yusa47, H. Yuta1, S. L. Zang12, C. C. Zhang12, J. Zhang10, L. M. Zhang40, Z. P. Zhang40, Y. Zheng9, V. Zhilich2, T. Ziegler37, D. Žontar21,15, and D. Zürcher20 (Belle Collaboration)
1Aomori University, Aomori
2Budker Institute of Nuclear Physics, Novosibirsk
3Chiba University, Chiba
4Chonnam National University, Kwangju
5Chuo University, Tokyo
6University of Cincinnati, Cincinnati, Ohio 45221
7University of Frankfurt, Frankfurt
8Gyeongsang National University, Chinju
9University of Hawaii, Honolulu, Hawaii 96822
10High Energy Accelerator Research Organization (KEK), Tsukuba
11Hiroshima Institute of Technology, Hiroshima
12Institute of High Energy Physics, Chinese Academy of Sciences, Beijing
13Institute of High Energy Physics, Vienna
14Institute for Theoretical and Experimental Physics, Moscow
15J. Stefan Institute, Ljubljana
16Kanagawa University, Yokohama
17Korea University, Seoul
18Kyoto University, Kyoto
19Kyungpook National University, Taegu
20Swiss Federal Institute of Technology of Lausanne, EPFL, Lausanne
21University of Ljubljana, Ljubljana
22University of Maribor, Maribor
23University of Melbourne, Victoria
24Nagoya University, Nagoya
25Nara Women’s University, Nara
26National Central University, Chung-li
27National Kaohsiung Normal University, Kaohsiung
28National United University, Miao Li
29Department of Physics, National Taiwan University, Taipei
30H. Niewodniczanski Institute of Nuclear Physics, Krakow
31Nihon Dental College, Niigata
32Niigata University, Niigata
33Osaka City University, Osaka
34Osaka University, Osaka
35Panjab University, Chandigarh
36Peking University, Beijing
37Princeton University, Princeton, New Jersey 08545
38RIKEN BNL Research Center, Upton, New York 11973
39Saga University, Saga
40University of Science and Technology of China, Hefei
41Seoul National University, Seoul
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
52Toyama National College of Maritime Technology, Toyama
53University of Tsukuba, Tsukuba
54Utkal University, Bhubaneswer
55Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
56Yonsei University, Seoul
Received 20 August 2004; published 5 November 2004
We report evidence for direct CP violation in the decay B0→K+π- with 253 fb-1 of data collected with the Belle detector at the KEKB e+e- collider. Using 275×106 BB̅ pairs we observe a B→K±π∓ signal with 2140±53 events. The measured CP violating asymmetry is ACP(K+π-)=-0.101±0.025(stat)±0.005(syst), corresponding to a significance of 3.9σ including systematics. We also search for CP violation in the decays B+→K+π0 and B+→π+π0. The measured CP violating asymmetries are ACP(K+π0)=0.04±0.05(stat)±0.02(syst) and ACP(π+π0)=-0.02±0.10(stat)±0.01(syst), corresponding to the intervals -0.05<ACP(K+π0)<0.13 and -0.18<ACP(π+π0)<0.14 at 90% confidence level.
© 2004 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.191802
DOI:
10.1103/PhysRevLett.93.191802
PACS:
13.25.Hw, 11.30.Er, 12.15.Hh, 14.40.Nd
*On leave from Nova Gorica Polytechnic, Nova Gorica.
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