Phys. Rev. Lett.
99,
011801
(2007)
[6 pages]
Measurement of the τ Lepton Mass and an Upper Limit on the Mass Difference between τ+ and τ-
K. Belous et al. The Belle Collaboration
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K. Belous11, M. Shapkin11, A. Sokolov11, K. Abe7, K. Abe42, I. Adachi7, H. Aihara44, D. Anipko1, K. Arinstein1, V. Aulchenko1, T. Aushev17,12, A. M. Bakich39, E. Barberio20, A. Bay17, I. Bedny1, U. Bitenc13, I. Bizjak13, S. Blyth23, A. Bondar1, A. Bozek26, M. Bračko7,19,13, T. E. Browder6, M.-C. Chang3, A. Chen23, K.-F. Chen25, W. T. Chen23, B. G. Cheon5, R. Chistov12, Y. Choi38, Y. K. Choi38, S. Cole39, J. Dalseno20, A. Drutskoy2, S. Eidelman1, D. Epifanov1, S. Fratina13, M. Fujikawa22, N. Gabyshev1, T. Gershon7, G. Gokhroo40, B. Golob18,13, H. Ha15, J. Haba7, Y. Hasegawa37, K. Hayasaka21, H. Hayashii22, M. Hazumi7, D. Heffernan31, T. Hokuue21, Y. Hoshi42, S. Hou23, W.-S. Hou25, T. Iijima21, K. Ikado21, A. Imoto22, K. Inami21, A. Ishikawa44, R. Itoh7, M. Iwasaki44, Y. Iwasaki7, H. Kaji21, J. H. Kang49, P. Kapusta26, N. Katayama7, T. Kawasaki28, H. R. Khan45, H. Kichimi7, Y. J. Kim4, P. Križan18,13, P. Krokovny7, R. Kulasiri2, R. Kumar32, C. C. Kuo23, A. Kuzmin1, Y.-J. Kwon49, J. Lee36, M. J. Lee36, S. E. Lee36, T. Lesiak26, S.-W. Lin25, D. Liventsev12, G. Majumder40, F. Mandl10, T. Matsumoto46, A. Matyja26, S. McOnie39, H. Miyake31, H. Miyata28, Y. Miyazaki21, R. Mizuk12, E. Nakano30, M. Nakao7, H. Nakazawa7, Z. Natkaniec26, S. Nishida7, O. Nitoh47, S. Ogawa41, T. Ohshima21, S. Okuno14, S. L. Olsen6, Y. Onuki34, H. Ozaki7, P. Pakhlov12, G. Pakhlova12, H. Park16, K. S. Park38, R. Pestotnik13, L. E. Piilonen48, A. Poluektov1, Y. Sakai7, N. Satoyama37, O. Schneider17, J. Schümann24, R. Seidl8,34, K. Senyo21, M. E. Sevior20, H. Shibuya41, B. Shwartz1, J. B. Singh32, A. Somov2, N. Soni32, S. Stanič29, M. Starič13, H. Stoeck39, S. Y. Suzuki7, F. Takasaki7, K. Tamai7, M. Tanaka7, G. N. Taylor20, Y. Teramoto30, X. C. Tian33, I. Tikhomirov12, K. Trabelsi7, T. Tsuboyama7, T. Tsukamoto7, S. Uehara7, T. Uglov12, K. Ueno25, S. Uno7, P. Urquijo20, Y. Usov1, G. Varner6, S. Villa17, A. Vinokurova1, C. H. Wang24, Y. Watanabe45, E. Won15, Q. L. Xie9, B. D. Yabsley39, A. Yamaguchi43, Y. Yamashita27, M. Yamauchi7, Z. P. Zhang35, V. Zhilich1, V. Zhulanov1, and A. Zupanc13 (The Belle Collaboration)
1Budker Institute of Nuclear Physics, Novosibirsk
2University of Cincinnati, Cincinnati, Ohio 45221
3Department of Physics, Fu Jen Catholic University, Taipei
4The Graduate University for Advanced Studies, Hayama
5Hanyang University, Seoul
6University of Hawaii, Honolulu, Hawaii 96822
7High Energy Accelerator Research Organization (KEK), Tsukuba
8University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
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 NSW
40Tata Institute of Fundamental Research, Bombay
41Toho University, Funabashi
42Tohoku Gakuin University, Tagajo
43Tohoku University, Sendai
44Department of Physics, University of Tokyo, Tokyo
45Tokyo Institute of Technology, Tokyo
46Tokyo Metropolitan University, Tokyo
47Tokyo University of Agriculture and Technology, Tokyo
48Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
49Yonsei University, Seoul
Received 2 February 2007; published 6 July 2007
The mass of the τ lepton has been measured in the decay mode τ→3πντ using a pseudomass technique. The result obtained from 414 fb-1 of data collected with the Belle detector is Mτ=[1776.61±0.13(stat)±0.35(sys)] MeV/c2. The upper limit on the relative mass difference between positive and negative τ leptons is |Mτ+-Mτ-|/Mτ<2.8×10-4 at 90% confidence level.
© 2007 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.011801
DOI:
10.1103/PhysRevLett.99.011801
PACS:
13.35.Dx, 11.30.Er, 13.25.Hw, 14.40.Lb
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