Phys. Rev. Lett.
98,
221802
(2007)
[6 pages]
Evidence for CP Violation in B0→D+D- Decays
S. Fratina et al. Belle Collaboration
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S. Fratina13, K. Abe8, K. Abe41, I. Adachi8, H. Aihara43, D. Anipko1, K. Arinstein1, T. Aushev17,12, A. M. Bakich39, E. Barberio20, A. Bay17, K. Belous11, U. Bitenc13, I. Bizjak13, A. Bondar1, A. Bozek26, M. Bračko8,19,13, J. Brodzicka26, T. E. Browder7, M.-C. Chang5, P. Chang25, Y. Chao25, A. Chen23, K.-F. Chen25, W. T. Chen23, B. G. Cheon3, R. Chistov12, Y. Choi38, Y. K. Choi38, S. Cole39, J. Dalseno20, M. Dash46, A. Drutskoy4, S. Eidelman1, A. Go23, B. Golob18,13, A. Gorišek13, H. Ha15, J. Haba8, K. Hara21, M. Hazumi8, D. Heffernan31, T. Hokuue21, Y. Hoshi41, W.-S. Hou25, T. Iijima21, K. Inami21, A. Ishikawa43, H. Ishino44, R. Itoh8, M. Iwasaki43, Y. Iwasaki8, H. Kaji21, J. H. Kang47, N. Katayama8, H. Kawai2, T. Kawasaki28, H. Kichimi8, H. J. Kim16, H. O. Kim38, S. K. Kim36, Y. J. Kim6, K. Kinoshita4, S. Korpar19,13, P. Križan18,13, P. Krokovny8, R. Kulasiri4, R. Kumar32, C. C. Kuo23, A. Kuzmin1, Y.-J. Kwon47, M. J. Lee36, S. E. Lee36, T. Lesiak26, A. Limosani8, S.-W. Lin25, D. Liventsev12, F. Mandl10, T. Matsumoto45, A. Matyja26, S. McOnie39, T. Medvedeva12, W. Mitaroff10, K. Miyabayashi22, H. Miyake31, H. Miyata28, Y. Miyazaki21, R. Mizuk12, G. R. Moloney20, T. Mori21, E. Nakano30, M. Nakao8, H. Nakazawa23, S. Nishida8, S. Noguchi22, S. Ogawa40, T. Ohshima21, S. Okuno14, S. L. Olsen7, Y. Onuki34, H. Ozaki8, P. Pakhlov12, G. Pakhlova12, C. W. Park38, H. Park16, L. S. Peak39, R. Pestotnik13, L. E. Piilonen46, Y. Sakai8, N. Satoyama37, T. Schietinger17, O. Schneider17, J. Schümann8, C. Schwanda10, A. J. Schwartz4, K. Senyo21, M. E. Sevior20, M. Shapkin11, H. Shibuya40, B. Shwartz1, J. B. Singh32, A. Somov4, N. Soni32, S. Stanič29, M. Starič13, H. Stoeck39, T. Sumiyoshi45, F. Takasaki8, K. Tamai8, M. Tanaka8, Y. Teramoto30, X. C. Tian33, I. Tikhomirov12, K. Trabelsi8, T. Tsukamoto8, S. Uehara8, K. Ueno25, T. Uglov12, Y. Unno3, S. Uno8, P. Urquijo20, Y. Usov1, G. Varner7, K. E. Varvell39, K. Vervink17, S. Villa17, C. H. Wang24, Y. Watanabe44, E. Won15, B. D. Yabsley39, A. Yamaguchi42, Y. Yamashita27, M. Yamauchi8, C. C. Zhang9, Z. P. Zhang35, V. Zhilich1, and A. Zupanc13 (Belle Collaboration)
1Budker Institute of Nuclear Physics, Novosibirsk
2Chiba University, Chiba
3University of Cincinnati, Cincinnati, Ohio 45221
4Department of Physics, Fu Jen Catholic University, Taipei
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
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 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
33Peking University, Beijing
34RIKEN BNL Research Center, Upton, New York 11973
35University of Science and Technology of China, Hefei
36Seoul National University, Seoul
37Shinshu University, Nagano
38Sungkyunkwan University, Suwon
39University of Sydney, Sydney, New South Wales
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
46Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
47Yonsei University, Seoul
Received 19 February 2007; published 31 May 2007
We report measurements of the branching fraction and CP violation parameters in B0→D+D- decays. The results are based on a data sample that contains 535×106 BB̅ pairs collected at the Υ(4S) resonance, with the Belle detector at the KEKB asymmetric-energy e+e- collider. We obtain [1.97±0.20(stat)±0.20(syst)]×10-4 for the branching fraction of B0→D+D-. The measured values of the CP violation parameters are S=-1.13±0.37±0.09, A=0.91±0.23±0.06, where the first error is statistical and the second is systematic. We find evidence of CP violation in B0→D+D- at the 4.1σ confidence level. While the value of S is consistent with expectations from other measurements, the value of the parameter A favors large direct CP violation at the 3.2σ confidence level, in contradiction to standard model expectations.
© 2007 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.221802
DOI:
10.1103/PhysRevLett.98.221802
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