Phys. Rev. Lett.
86,
3228–3232
(2001)
Measurement of Bd0-B̅ d0 Mixing Rate from the Time Evolution of Dilepton Events at the ϒ(4S)
K. Abe et al. (Belle Collaboration)
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K. Abe8, K. Abe36, I. Adachi8, Byoung Sup Ahn14, H. Aihara37, M. Akatsu19, G. Alimonti7, K. Aoki8, K. Asai20, M. Asai9, Y. Asano42, T. Aso41, V. Aulchenko2, T. Aushev12, A. M. Bakich33, E. Banas15, S. Behari8, P. K. Behera43, D. Beiline2, A. Bondar2, A. Bozek15, T. E. Browder7, B. C. K. Casey7, P. Chang23, Y. Chao23, B. G. Cheon32, S.-K. Choi6, Y. Choi32, Y. Doi8, J. Dragic17, S. Eidelman2, Y. Enari19, R. Enomoto8,10, C. W. Everton17, F. Fang7, H. Fujii8, Y. Fujita8, C. Fukunaga39, M. Fukushima10, A. Garmash2,8, A. Gordon17, K. Gotow44, H. Guler7, R. Guo21, J. Haba8, T. Haji4, H. Hamasaki8, K. Hanagaki29, F. Handa36, K. Hara27, T. Hara27, N. C. Hastings17, K. Hayashi8, H. Hayashii20, M. Hazumi27, E. M. Heenan17, I. Higuchi36, T. Higuchi37, T. Hirai38, H. Hirano40, T. Hojo27, Y. Hoshi35, W.-S. Hou23, S.-C. Hsu23, H.-C. Huang23, Y.-C. Huang21, S. Ichizawa38, Y. Igarashi8, T. Iijima8, H. Ikeda8, K. Ikeda20, K. Inami19, Y. Inoue26, A. Ishikawa19, H. Ishino38, R. Itoh8, G. Iwai25, H. Iwasaki8, Y. Iwasaki8, D. J. Jackson27, P. Jalocha15, H. K. Jang31, M. Jones7, R. Kagan12, H. Kakuno38, J. Kaneko38, J. H. Kang45, J. S. Kang14, P. Kapusta15, K. Kasami8, N. Katayama8, H. Kawai3, M. Kawai8, N. Kawamura1, T. Kawasaki25, H. Kichimi8, D. W. Kim32, Heejong Kim45, H. J. Kim45, Hyunwoo Kim14, S. K. Kim31, K. Kinoshita5, S. Kobayashi30, S. Koike8, S. Koishi38, H. Konishi40, K. Korotushenko29, P. Krokovny2, R. Kulasiri5, S. Kumar28, T. Kuniya30, E. Kurihara3, A. Kuzmin2, Y.-J. Kwon45, M. H. Lee8, S. H. Lee31, C. Leonidopoulos29, H.-B. Li11, R.-S. Lu23, Y. Makida8, A. Manabe8, D. Marlow29, T. Matsubara37, T. Matsuda8, S. Matsui19, S. Matsumoto4, T. Matsumoto19, K. Miyabayashi20, H. Miyake27, H. Miyata25, L. C. Moffitt17, A. Mohapatra43, G. R. Moloney17, G. F. Moorhead17, S. Mori4, T. Mori4, A. Murakami30, T. Nagamine36, Y. Nagasaka18, Y. Nagashima27, T. Nakadaira37, E. Nakano26, M. Nakao8, H. Nakazawa4, J. W. Nam32, S. Narita36, Z. Natkaniec15, K. Neichi35, S. Nishida16, O. Nitoh40, S. Noguchi20, T. Nozaki8, S. Ogawa34, T. Ohshima19, Y. Ohshima38, T. Okabe19, T. Okazaki20, S. Okuno13, S. L. Olsen7, H. Ozaki8, P. Pakhlov12, H. Palka15, C. S. Park31, C. W. Park14, H. Park14, L. S. Peak33, M. Peters7, L. E. Piilonen44, E. Prebys29, J. Raaf5, J. L. Rodriguez7, N. Root2, M. Rozanska15, K. Rybicki15, J. Ryuko27, H. Sagawa8, Y. Sakai8, H. Sakamoto16, H. Sakaue26, M. Satapathy43, N. Sato8, A. Satpathy8,5, S. Schrenk44, S. Semenov12, M. E. Sevior17, H. Shibuya34, B. Shwartz2, A. Sidorov2, V. Sidorov2, S. Stanic̆42, A. Sugi19, A. Sugiyama19, K. Sumisawa27, T. Sumiyoshi8, J. Suzuki8, K. Suzuki3, S. Suzuki19, S. Y. Suzuki8, S. K. Swain7, H. Tajima37, T. Takahashi26, F. Takasaki8, M. Takita27, K. Tamai8, N. Tamura25, J. Tanaka37, M. Tanaka8, Y. Tanaka18, G. N. Taylor17, Y. Teramoto26, M. Tomoto19, T. Tomura37, S. N. Tovey17, K. Trabelsi7, T. Tsuboyama8, Y. Tsujita42, T. Tsukamoto8, T. Tsukamoto30, S. Uehara8, K. Ueno23, N. Ujiie8, Y. Unno3, S. Uno8, Y. Ushiroda16, Y. Usov2, S. E. Vahsen29, G. Varner7, K. E. Varvell33, C. C. Wang23, C. H. Wang22, M.-Z. Wang23, T. J. Wang11, Y. Watanabe38, E. Won31, B. D. Yabsley8, Y. Yamada8, M. Yamaga36, A. Yamaguchi36, H. Yamaguchi8, H. Yamaoka8, Y. Yamaoka8, Y. Yamashita24, M. Yamauchi8, S. Yanaka38, M. Yokoyama37, K. Yoshida19, Y. Yusa36, H. Yuta1, C. C. Zhang11, H. W. Zhao8, Y. Zheng7, V. Zhilich2, and D. Z̆ontar42 (Belle Collaboration)
1Aomori University, Aomori
2Budker Institute of Nuclear Physics, Novosibirsk
3Chiba University, Chiba
4Chou University, Tokyo
5University of Cincinnati, Cincinnati, Ohio
6Gyeongsang National University, Chinju
7University of Hawaii, Honolulu, Hawaii
8High Energy Accelerator Research Organization (KEK), Tsukuba
9Hiroshima Institute of Technology, Hiroshima
10Institute for Cosmic Ray Research, University of Tokyo, Tokyo
11Institute of High Energy Physics, Chinese Academy of Sciences, Beijing
12Institute for Theoretical and Experimental Physics, Moscow
13Kanagawa University, Yokohama
14Korea University, Seoul
15H. Niewodniczanski Institute of Nuclear Physics, Krakow
16Kyoto University, Kyoto
17University of Melbourne, Victoria
18Nagasaki Institute of Applied Science, Nagasaki
19Nagoya University, Nagoya
20Nara Women's University, Nara
21National Kaohsiung Normal University, Kaohsiung
22National Lien-Ho Institute of Technology, Miao Li
23National Taiwan University, Taipei
24Nihon Dental College, Niigata
25Niigata University, Niigata
26Osaka City University, Osaka
27Osaka University, Osaka
28Panjab University, Chandigarh
29Princeton University, Princeton, New Jersey
30Saga University, Saga
31Seoul National University, Seoul
32Sungkyunkwan University, Suwon
33University of Sydney, Sydney NSW
34Toho University, Funabashi
35Tohoku Gakuin University, Tagajo
36Tohoku University, Sendai
37University of Tokyo, Tokyo
38Tokyo Institute of Technology, Tokyo
39Tokyo Metropolitan University, Tokyo
40Tokyo University of Agriculture and Technology, Tokyo
41Toyama National College of Maritime Technology, Toyama
42University of Tsukuba, Tsukuba
43Utkal University, Bhubaneswer
44Virginia Polytechnic Institute and State University, Blacksburg, Virginia
45Yonsei University, Seoul
Received 27 November 2000; published in the issue dated 9 April 2001
We report a determination of the Bd0-B̅ d0 mixing parameter Δmd based on the time evolution of dilepton yields in ϒ(4S) decays. The measurement is based on a 5.9fb-1 data sample collected by the Belle detector at KEKB. The proper-time difference distributions for same-sign and opposite-sign dilepton events are simultaneously fitted to an expression containing Δmd as a free parameter. Using both muons and electrons, we obtain Δmd = 0.463±0.008(stat)±0.016(syst)ps-1. This is the first determination of Δmd from time evolution measurements at the ϒ(4S). We also place limits on possible CPT violations.
© 2001 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.86.3228
DOI:
10.1103/PhysRevLett.86.3228
PACS:
11.30.Er, 13.20.He, 14.40.Nd
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