Phys. Rev. Lett.
99,
131803
(2007)
[6 pages]
Measurement of D0-D̅ 0 Mixing Parameters in D0→Ksπ+π- Decays
L. M. Zhang et al. Belle Collaboration
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L. M. Zhang37, Z. P. Zhang37, I. Adachi7, H. Aihara45, V. Aulchenko1, T. Aushev18,13, A. M. Bakich40, V. Balagura13, E. Barberio21, A. Bay18, K. Belous12, U. Bitenc14, A. Bondar1, A. Bozek27, M. Bračko20,14, J. Brodzicka7, T. E. Browder6, P. Chang26, Y. Chao26, A. Chen24, K.-F. Chen26, W. T. Chen24, B. G. Cheon5, C.-C. Chiang26, I.-S. Cho50, Y. Choi39, Y. K. Choi39, J. Dalseno21, M. Danilov13, M. Dash49, A. Drutskoy3, S. Eidelman1, D. Epifanov1, S. Fratina14, N. Gabyshev1, G. Gokhroo41, B. Golob19,14, H. Ha16, J. Haba7, T. Hara32, N. C. Hastings45, K. Hayasaka22, H. Hayashii23, M. Hazumi7, D. Heffernan32, T. Hokuue22, Y. Hoshi43, W.-S. Hou26, Y. B. Hsiung26, H. J. Hyun17, T. Iijima22, K. Ikado22, K. Inami22, A. Ishikawa45, H. Ishino46, R. Itoh7, M. Iwasaki45, Y. Iwasaki7, N. J. Joshi41, D. H. Kah17, H. Kaji22, S. Kajiwara32, J. H. Kang50, H. Kawai2, T. Kawasaki29, H. Kichimi7, H. J. Kim17, H. O. Kim39, S. K. Kim38, Y. J. Kim4, K. Kinoshita3, S. Korpar20,14, P. Križan19,14, P. Krokovny7, R. Kumar33, C. C. Kuo24, A. Kuzmin1, Y.-J. Kwon50, J. S. Lee39, M. J. Lee38, S. E. Lee38, T. Lesiak27, J. Li6, A. Limosani21, S.-W. Lin26, Y. Liu4, D. Liventsev13, T. Matsumoto47, A. Matyja27, S. McOnie40, T. Medvedeva13, W. Mitaroff11, H. Miyake32, H. Miyata29, Y. Miyazaki22, R. Mizuk13, Y. Nagasaka8, I. Nakamura7, E. Nakano31, M. Nakao7, Z. Natkaniec27, S. Nishida7, O. Nitoh48, S. Ogawa42, T. Ohshima22, S. Okuno15, S. L. Olsen6, Y. Onuki35, W. Ostrowicz27, H. Ozaki7, P. Pakhlov13, G. Pakhlova13, C. W. Park39, H. Park17, L. S. Peak40, R. Pestotnik14, L. E. Piilonen49, A. Poluektov1, H. Sahoo6, Y. Sakai7, O. Schneider18, J. Schümann7, C. Schwanda11, A. J. Schwartz3, R. Seidl9,35, K. Senyo22, M. E. Sevior21, M. Shapkin12, H. Shibuya42, S. Shinomiya32, J.-G. Shiu26, B. Shwartz1, J. B. Singh33, A. Sokolov12, A. Somov3, N. Soni33, S. Stanič30, M. Starič14, H. Stoeck40, K. Sumisawa7, T. Sumiyoshi47, S. Suzuki36, O. Tajima7, F. Takasaki7, K. Tamai7, N. Tamura29, M. Tanaka7, G. N. Taylor21, Y. Teramoto31, X. C. Tian34, I. Tikhomirov13, T. Tsuboyama7, S. Uehara7, K. Ueno26, T. Uglov13, Y. Unno5, S. Uno7, P. Urquijo21, Y. Usov1, G. Varner6, K. Vervink18, S. Villa18, A. Vinokurova1, C. H. Wang25, M.-Z. Wang26, P. Wang10, Y. Watanabe15, E. Won16, B. D. Yabsley40, A. Yamaguchi44, Y. Yamashita28, M. Yamauchi7, C. Z. Yuan10, C. C. Zhang10, V. Zhilich1, and A. Zupanc14 (Belle Collaboration)
1Budker Institute of Nuclear Physics, Novosibirsk
2Chiba University, Chiba
3University of Cincinnati, Cincinnati, Ohio 45221
4The Graduate University for Advanced Studies, Hayama
5Hanyang University, Seoul
6University of Hawaii, Honolulu, Hawaii 96822
7High Energy Accelerator Research Organization (KEK), Tsukuba
8Hiroshima Institute of Technology, Hiroshima
9University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
10Institute of High Energy Physics, Chinese Academy of Sciences, Beijing
11Institute of High Energy Physics, Vienna
12Institute of High Energy Physics, Protvino
13Institute for Theoretical and Experimental Physics, Moscow
14J. Stefan Institute, Ljubljana
15Kanagawa University, Yokohama
16Korea University, Seoul
17Kyungpook National University, Taegu
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
35RIKEN BNL Research Center, Upton, New York 11973
36Saga University, Saga
37University of Science and Technology of China, Hefei
38Seoul National University, Seoul
39Sungkyunkwan University, Suwon
40University of Sydney, Sydney, New South Wales
41Tata Institute of Fundamental Research, Mumbai
42Toho University, Funabashi
43Tohoku Gakuin University, Tagajo
44Tohoku University, Sendai
45Department of Physics, University of Tokyo, Tokyo
46Tokyo Institute of Technology, Tokyo
47Tokyo Metropolitan University, Tokyo
48Tokyo University of Agriculture and Technology, Tokyo
49Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
50Yonsei University, Seoul
Received 21 June 2007; published 28 September 2007
We report a measurement of D0-D̅ 0 mixing parameters in D0→KS0π+π- decays using a time-dependent Dalitz-plot analysis. We first assume CP conservation and subsequently allow for CP violation. The results are based on 540 fb-1 of data accumulated with the Belle detector at the KEKB e+e- collider. Assuming negligible CP violation, we measure the mixing parameters x=(0.80±0.29-0.07-0.14+0.09+0.10)% and y=(0.33±0.24-0.12-0.08+0.08+0.06)%, where the errors are statistical, experimental systematic, and systematic due to the Dalitz decay model, respectively. Allowing for CP violation, we obtain the CP-violating parameters |q/p|=0.86-0.29-0.03+0.30+0.06±0.08 and arg(q/p)=(-14-18-3-4+16+5+2)°.
© 2007 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.131803
DOI:
10.1103/PhysRevLett.99.131803
PACS:
13.25.Ft, 11.30.Er, 12.15.Ff
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