Phys. Rev. Lett.
98,
211803
(2007)
[6 pages]
Evidence for D0-D̅ 0 Mixing
M. Starič et al. Belle Collaboration
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M. Starič15, B. Golob19,15, K. Abe8, K. Abe45, I. Adachi8, H. Aihara47, K. Arinstein1, T. Aushev18,14, T. Aziz43, S. Bahinipati2, A. M. Bakich42, V. Balagura14, E. Barberio21, A. Bay18, K. Belous13, U. Bitenc15, I. Bizjak15, S. Blyth24, A. Bondar1, A. Bozek27, M. Bračko8,20,15, J. Brodzicka27, T. E. Browder7, P. Chang26, Y. Chao26, A. Chen24, K.-F. Chen26, W. T. Chen24, B. G. Cheon6, R. Chistov14, I.-S. Cho52, S.-K. Choi5, Y. Choi41, S. Cole42, J. Dalseno21, M. Danilov14, M. Dash51, J. Dragic8, A. Drutskoy2, S. Eidelman1, D. Epifanov1, S. Fratina15, N. Gabyshev1, A. Garmash35, A. Gorišek15, H. Ha17, J. Haba8, T. Hara32, N. C. Hastings47, K. Hayasaka22, H. Hayashii23, M. Hazumi8, D. Heffernan32, T. Higuchi8, T. Hokuue22, Y. Hoshi45, W.-S. Hou26, T. Iijima22, K. Ikado22, K. Inami22, A. Ishikawa47, H. Ishino48, R. Itoh8, M. Iwasaki47, Y. Iwasaki8, H. Kaji22, P. Kapusta27, N. Katayama8, T. Kawasaki29, A. Kibayashi48, H. Kichimi8, S. K. Kim39, Y. J. Kim4, K. Kinoshita2, S. Korpar20,15, P. Križan19,15, P. Krokovny8, R. Kumar33, C. C. Kuo24, A. Kuzmin1, Y.-J. Kwon52, J. S. Lange3, M. J. Lee39, S. E. Lee39, T. Lesiak27, J. Li7, A. Limosani8, S.-W. Lin26, D. Liventsev14, F. Mandl12, D. Marlow35, T. Matsumoto49, A. Matyja27, S. McOnie42, T. Medvedeva14, W. Mitaroff12, K. Miyabayashi23, H. Miyake32, H. Miyata29, Y. Miyazaki22, R. Mizuk14, D. Mohapatra51, Y. Nagasaka9, I. Nakamura8, E. Nakano31, M. Nakao8, H. Nakazawa24, Z. Natkaniec27, S. Nishida8, O. Nitoh50, S. Noguchi23, T. Nozaki8, S. Ogawa44, S. Okuno16, S. L. Olsen7, Y. Onuki36, H. Ozaki8, P. Pakhlov14, G. Pakhlova14, H. Palka27, R. Pestotnik15, L. E. Piilonen51, A. Poluektov1, M. Rozanska27, H. Sahoo7, Y. Sakai8, N. Satoyama40, O. Schneider18, J. Schümann8, C. Schwanda12, A. J. Schwartz2, R. Seidl10,36, K. Senyo22, M. E. Sevior21, M. Shapkin13, C. P. Shen11, H. Shibuya44, B. Shwartz1, A. Sokolov13, A. Somov2, S. Stanič30, H. Stoeck42, K. Sumisawa8, T. Sumiyoshi49, S. Suzuki37, S. Y. Suzuki8, O. Tajima8, F. Takasaki8, K. Tamai8, M. Tanaka8, G. N. Taylor21, Y. Teramoto31, X. C. Tian34, I. Tikhomirov14, K. Trabelsi8, T. Tsuboyama8, T. Tsukamoto8, S. Uehara8, K. Ueno26, T. Uglov14, Y. Unno6, S. Uno8, P. Urquijo21, Y. Ushiroda8, Y. Usov1, G. Varner7, K. E. Varvell42, K. Vervink18, S. Villa18, A. Vinokurova1, C. H. Wang25, M.-Z. Wang26, Y. Watanabe48, J. Wicht18, E. Won17, Q. L. Xie11, B. D. Yabsley42, A. Yamaguchi46, H. Yamamoto46, Y. Yamashita28, M. Yamauchi8, C. Z. Yuan11, Y. Yuan11, C. C. Zhang11, L. M. Zhang38, Z. P. Zhang38, V. Zhilich1, and A. Zupanc15 (Belle Collaboration)
1Budker Institute of Nuclear Physics, Novosibirsk
2University of Cincinnati, Cincinnati, Ohio 45221
3Justus-Liebig-Universität Gießen, Gießen
4The Graduate University for Advanced Studies, Hayama
5Gyeongsang National University, Chinju
6Hanyang University, Seoul
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
18Swiss Federal Institute of Technology of Lausanne, EPFL, Lausanne
19University of Ljubljana, Ljubljana
20University of Maribor, Maribor
21University of Melbourne, School of Physics, Victoria 3010
22Nagoya University, Nagoya
23Nara Women’s University, Nara
24National Central University, Chung-li
25National United University, Miao Li
26Department of Physics, National Taiwan University, Taipei
27H. Niewodniczanski Institute of Nuclear Physics, Krakow
28Nippon Dental University, Niigata
29Niigata University, Niigata
30University of Nova Gorica, Nova Gorica
31Osaka City University, Osaka
32Osaka University, Osaka
33Panjab University, Chandigarh
34Peking University, Beijing
35Princeton University, Princeton, New Jersey 08544
36RIKEN BNL Research Center, Upton, New York 11973
37Saga University, Saga
38University of Science and Technology of China, Hefei
39Seoul National University, Seoul
40Shinshu University, Nagano
41Sungkyunkwan University, Suwon
42University of Sydney, Sydney, New South Wales
43Tata Institute of Fundamental Research, Mumbai
44Toho University, Funabashi
45Tohoku Gakuin University, Tagajo
46Tohoku University, Sendai
47Department of Physics, University of Tokyo, Tokyo
48Tokyo Institute of Technology, Tokyo
49Tokyo Metropolitan University, Tokyo
50Tokyo University of Agriculture and Technology, Tokyo
51Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
52Yonsei University, Seoul
Received 31 March 2007; published 24 May 2007
We observe evidence for D0-D̅ 0 mixing by measuring the difference in the apparent lifetime when a D0 meson decays to the CP eigenstates K+K- and π+π- and when it decays to the final state K-π+. We find the relative difference of the lifetimes yCP to be [1.31±0.32(stat)±0.25(syst)]%, 3.2 standard deviations from zero. We also search for a CP asymmetry between D0 and D̅ 0 decays; no evidence for CP violation is found. These results are based on 540 fb-1 of data recorded by the Belle detector at the KEKB e+e- collider.
© 2007 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.211803
DOI:
10.1103/PhysRevLett.98.211803
PACS:
13.25.Ft, 11.30.Er, 12.15.Ff
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