Phys. Rev. D
79,
051103(R)
(2009)
[5 pages]
Measurement of the branching fraction for the decay Υ(4S)→Υ(1S)π+π-
A. Sokolov et al. Belle Collaboration
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A. Sokolov14, M. Shapkin14, H. Aihara44, K. Arinstein1,32, T. Aushev15,20, A. M. Bakich39, E. Barberio22, A. Bay20, K. Belous14, V. Bhardwaj34, A. Bondar1,32, M. Bračko16,21, T. E. Browder9, M.-C. Chang5, P. Chang27, A. Chen25, K.-F. Chen27, B. G. Cheon8, C.-C. Chiang27, R. Chistov15, I.-S. Cho49, Y. Choi38, M. Dash48, A. Drutskoy3, W. Dungel13, S. Eidelman1,32, D. Epifanov1,32, N. Gabyshev1,32, P. Goldenzweig3, H. Ha18, J. Haba10, B.-Y. Han18, H. Hayashii24, M. Hazumi10, Y. Horii43, Y. Hoshi42, W.-S. Hou27, Y. B. Hsiung27, H. J. Hyun19, T. Iijima23, K. Inami23, A. Ishikawa35, H. Ishino45,*, Y. Iwasaki10, N. J. Joshi40, D. H. Kah19, H. Kaji23, J. H. Kang49, H. Kawai2, T. Kawasaki30, H. Kichimi10, H. J. Kim19, H. O. Kim19, S. K. Kim37, Y. I. Kim19, Y. J. Kim7, K. Kinoshita3, B. R. Ko18, S. Korpar16,21, P. Križan16,50, P. Krokovny10, A. Kuzmin1,32, Y.-J. Kwon49, S.-H. Kyeong49, J. S. Lange6, M. J. Lee37, S. E. Lee37, T. Lesiak4,28, J. Li9, A. Limosani22, S.-W. Lin27, Y. Liu23, D. Liventsev15, R. Louvot20, F. Mandl13, A. Matyja28, S. McOnie39, H. Miyata30, Y. Miyazaki23, R. Mizuk15, T. Mori23, Y. Nagasaka11, E. Nakano33, M. Nakao10, S. Nishida10, O. Nitoh47, S. Noguchi24, S. Ogawa41, T. Ohshima23, S. Okuno17, H. Ozaki10, P. Pakhlov15, G. Pakhlova15, C. W. Park38, H. Park19, H. K. Park19, K. S. Park38, R. Pestotnik16, L. E. Piilonen48, A. Poluektov1,32, H. Sahoo9, Y. Sakai10, O. Schneider20, C. Schwanda13, A. Sekiya24, K. Senyo23, M. E. Sevior22, C. P. Shen9, J.-G. Shiu27, B. Shwartz1,32, J. B. Singh34, S. Stanič31, M. Starič16, T. Sumiyoshi46, M. Tanaka10, G. N. Taylor22, Y. Teramoto33, T. Tsuboyama10, S. Uehara10, T. Uglov15, Y. Unno8, S. Uno10, Y. Usov1,32, G. Varner9, K. E. Varvell39, K. Vervink20, A. Vinokurova1,32, C. H. Wang26, M.-Z. Wang27, P. Wang12, X. L. Wang12, Y. Watanabe17, R. Wedd22, E. Won18, B. D. Yabsley39, Y. Yamashita29, C. Z. Yuan12, Z. P. Zhang36, V. Zhilich1,32, V. Zhulanov1,32, T. Zivko16, A. Zupanc16, and O. Zyukova1,32 (Belle Collaboration)
1Budker Institute of Nuclear Physics, Novosibirsk
2Chiba University, Chiba
3University of Cincinnati, Cincinnati, Ohio 45221
4T. Kościuszko Cracow University of Technology, Krakow
5Department of Physics, Fu Jen Catholic University, Taipei
6Justus-Liebig-Universität Gießen, Gießen
7The Graduate University for Advanced Studies, Hayama
8Hanyang University, Seoul
9University of Hawaii, Honolulu, Hawaii 96822
10High Energy Accelerator Research Organization (KEK), Tsukuba
11Hiroshima Institute of Technology, Hiroshima
12Institute of High Energy Physics, Chinese Academy of Sciences, Beijing
13Institute of High Energy Physics, Vienna
14Institute of High Energy Physics, Protvino
15Institute for Theoretical and Experimental Physics, Moscow
16J. Stefan Institute, Ljubljana
17Kanagawa University, Yokohama
18Korea University, Seoul
19Kyungpook National University, Taegu
20École Polytechnique Fédérale de Lausanne (EPFL), Lausanne
21University of Maribor, Maribor
22University of Melbourne, School of Physics, Victoria 3010
23Nagoya University, Nagoya
24Nara Women’s University, Nara
25National Central University, Chung-li
26National United University, Miao Li
27Department of Physics, National Taiwan University, Taipei
28H. Niewodniczanski Institute of Nuclear Physics, Krakow
29Nippon Dental University, Niigata
30Niigata University, Niigata
31University of Nova Gorica, Nova Gorica
32Novosibirsk State University, Novosibirsk
33Osaka City University, Osaka
34Panjab University, Chandigarh
35Saga University, Saga
36University of Science and Technology of China, Hefei
37Seoul National University, Seoul
38Sungkyunkwan University, Suwon
39University of Sydney, Sydney, New South Wales
40Tata Institute of Fundamental Research, Mumbai
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
48IPNAS, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
49Yonsei University, Seoul
50Faculty of Mathematics and Physics, University of Ljubljana, Ljubljana
Received 13 January 2009; published 20 March 2009
We study transitions between Υ states with the emission of charged pions using 604.6 fb-1 of data collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. The measured product branching fraction is B(Υ(4S)→Υ(1S)π+π-)×B(Υ(1S)→μ+μ-)=(2.11±0.30(stat)±0.14(sys))×10-6 and the partial decay width is Γ(Υ(4S)→Υ(1S)π+π-)=(1.75±0.25(stat)±0.24(sys)) keV.
© 2009 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.79.051103
DOI:
10.1103/PhysRevD.79.051103
PACS:
13.25.Gv, 14.60.Ef, 14.40.Aq
*Now at Okayama University, Okayama.
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