Phys. Rev. D
80,
111104(R)
(2009)
[6 pages]
Evidence of time-dependent CP violation in the decay B0→D*+D*-
K. Vervink et al.
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K. Vervink16, T. Aushev16,11, O. Schneider16, K. Arinstein1, A. M. Bakich36, V. Balagura11, E. Barberio19, A. Bay16, V. Bhardwaj31, U. Bitenc12, A. Bondar1, A. Bozek25, M. Bračko18,12, J. Brodzicka7, T. E. Browder6, Y. Chao24, A. Chen22, B. G. Cheon5, C.-C. Chiang24, R. Chistov11, I.-S. Cho42, Y. Choi35, J. Dalseno7, M. Danilov11, W. Dungel9, S. Eidelman1, S. Fratina12, N. Gabyshev1, P. Goldenzweig3, B. Golob17,12, H. Ha14, T. Hara30, K. Hayasaka20, H. Hayashii21, M. Hazumi7, D. Heffernan30, Y. Hoshi37, W.-S. Hou24, H. J. Hyun15, K. Inami20, A. Ishikawa32, H. Ishino38,*, Y. Iwasaki7, D. H. Kah15, J. H. Kang42, N. Katayama7, H. Kawai2, T. Kawasaki27, H. Kichimi7, H. J. Kim15, H. O. Kim15, Y. I. Kim15, Y. J. Kim4, K. Kinoshita3, B. R. Ko14, S. Korpar18,12, P. Križan17,12, P. Krokovny7, A. Kuzmin1, Y.-J. Kwon42, S.-H. Kyeong42, J. S. Lee35, M. J. Lee34, J. Li6, A. Limosani19, C. Liu33, Y. Liu4, D. Liventsev11, R. Louvot16, A. Matyja25, S. McOnie36, K. Miyabayashi21, H. Miyata27, Y. Miyazaki20, R. Mizuk11, M. Nakao7, H. Nakazawa22, Z. Natkaniec25, S. Nishida7, K. Nishimura6, O. Nitoh40, T. Ohshima20, S. Okuno13, H. Ozaki7, P. Pakhlov11, G. Pakhlova11, C. W. Park35, H. Park15, H. K. Park15, R. Pestotnik12, L. E. Piilonen41, A. Poluektov1, H. Sahoo6, Y. Sakai7, J. Schümann7, A. J. Schwartz3, K. Senyo20, M. E. Sevior19, M. Shapkin10, C. P. Shen6, J.-G. Shiu24, B. Shwartz1, S. Stanič28, J. Stypula25, T. Sumiyoshi39, N. Tamura27, Y. Teramoto29, K. Trabelsi7, T. Tsuboyama7, S. Uehara7, T. Uglov11, Y. Unno5, S. Uno7, G. Varner6, C. C. Wang24, C. H. Wang23, P. Wang8, Y. Watanabe13, J. Wicht7, E. Won14, B. D. Yabsley36, Y. Yamashita26, Z. P. Zhang33, V. Zhilich1, V. Zhulanov1, T. Zivko12, A. Zupanc12, and N. Zwahlen16 (The 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
8Institute of High Energy Physics, Chinese Academy of Sciences, Beijing
9Institute of High Energy Physics, Vienna
10Institute of High Energy Physics, Protvino
11Institute for Theoretical and Experimental Physics, Moscow
12J. Stefan Institute, Ljubljana
13Kanagawa University, Yokohama
14Korea University, Seoul
15Kyungpook National University, Taegu
16École Polytechnique Fédérale de Lausanne (EPFL), Lausanne
17Faculty of Mathematics and Physics, University of Ljubljana, Ljubljana
18University of Maribor, Maribor
19University of Melbourne, School of Physics, Victoria 3010
20Nagoya University, Nagoya
21Nara Women’s University, Nara
22National Central University, Chung-li
23National United University, Miao Li
24Department of Physics, National Taiwan University, Taipei
25H. Niewodniczanski Institute of Nuclear Physics, Krakow
26Nippon Dental University, Niigata
27Niigata University, Niigata
28University of Nova Gorica, Nova Gorica
29Osaka City University, Osaka
30Osaka University, Osaka
31Panjab University, Chandigarh
32Saga University, Saga
33University of Science and Technology of China, Hefei
34Seoul National University, Seoul
35Sungkyunkwan University, Suwon
36University of Sydney, Sydney, New South Wales
37Tohoku Gakuin University, Tagajo
38Tokyo Institute of Technology, Tokyo
39Tokyo Metropolitan University, Tokyo
40Tokyo University of Agriculture and Technology, Tokyo
41IPNAS, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
42Yonsei University, Seoul
Received 26 January 2009; published 14 December 2009
We report a measurement of the CP-odd fraction and the time-dependent CP violation in B0→D*+D*- decays, using 657×106 BB̅ events collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We measure a CP-odd fraction of R⊥=0.125±0.043(stat)±0.023(syst). From the distributions of the proper-time intervals between a B0→D*+D*- decay and the other B meson in the event, we obtain evidence of CP violation with measured parameters AD*+D*-=0.15±0.13(stat)±0.04(syst) and SD*+D*-=-0.96±0.25(stat)-0.16+0.13(syst).
© 2009 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.80.111104
DOI:
10.1103/PhysRevD.80.111104
PACS:
13.25.Hw, 11.30.Er, 12.15.Ff
*Now at Okayama University, Okayama
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