Phys. Rev. Lett.
102,
021801
(2009)
[6 pages]
Measurement of the Decay Bs0→Ds-π+ and Evidence for Bs0→Ds∓K± in e+e- Annihilation at √s≈10.87 GeV
R. Louvot et al. Belle Collaboration
Show All Authors/Affiliations
Hide All Authors/Affiliations
R. Louvot18, J. Wicht9, O. Schneider18, I. Adachi9, H. Aihara42, K. Arinstein1, V. Aulchenko1, T. Aushev18,13, A. M. Bakich38, V. Balagura13, A. Bay18, V. Bhardwaj33, U. Bitenc14, A. Bondar1, A. Bozek27, M. Bračko20,14, T. E. Browder8, A. Chen24, B. G. Cheon7, R. Chistov13, I.-S. Cho47, Y. Choi37, J. Dalseno9, M. Danilov13, M. Dash46, A. Drutskoy3, W. Dungel11, S. Eidelman1, N. Gabyshev1, P. Goldenzweig3, B. Golob19,14, H. Ha16, J. Haba9, K. Hayasaka22, H. Hayashii23, M. Hazumi9, Y. Hoshi41, W.-S. Hou26, H. J. Hyun17, T. Iijima22, K. Inami22, A. Ishikawa34, H. Ishino43,*, R. Itoh9, M. Iwasaki42, N. J. Joshi39, D. H. Kah17, J. H. Kang47, N. Katayama9, H. Kawai2, T. Kawasaki29, H. Kichimi9, S. K. Kim36, Y. I. Kim17, Y. J. Kim6, K. Kinoshita3, S. Korpar20,14, P. Križan19,14, P. Krokovny9, R. Kumar33, A. Kuzmin1, Y.-J. Kwon47, S.-H. Kyeong47, J. S. Lange5, J. S. Lee37, M. J. Lee36, S. E. Lee36, T. Lesiak27,4, J. Li8, A. Limosani21, S.-W. Lin26, D. Liventsev13, F. Mandl11, A. Matyja27, S. McOnie38, T. Medvedeva13, K. Miyabayashi23, H. Miyake32, H. Miyata29, Y. Miyazaki22, R. Mizuk13, T. Mori22, E. Nakano31, M. Nakao9, S. Nishida9, O. Nitoh45, S. Ogawa40, T. Ohshima22, S. Okuno15, H. Ozaki9, G. Pakhlova13, C. W. Park37, H. K. Park17, R. Pestotnik14, L. E. Piilonen46, H. Sahoo8, Y. Sakai9, J. Schümann9, A. J. Schwartz3, A. Sekiya23, K. Senyo22, M. E. Sevior21, M. Shapkin12, J.-G. Shiu26, J. B. Singh33, A. Somov3, S. Stanič30, M. Starič14, K. Sumisawa9, T. Sumiyoshi44, M. Tanaka9, G. N. Taylor21, Y. Teramoto31, I. Tikhomirov13, K. Trabelsi9, S. Uehara9, T. Uglov13, Y. Unno7, S. Uno9, Y. Usov1, G. Varner8, K. Vervink18, C. C. Wang26, C. H. Wang25, P. Wang10, X. L. Wang10, Y. Watanabe15, R. Wedd21, E. Won16, B. D. Yabsley38, Y. Yamashita28, M. Yamauchi9, Z. P. Zhang35, V. Zhilich1, V. Zhulanov1, T. Zivko14, A. Zupanc14, N. Zwahlen18, and O. Zyukova1 (Belle Collaboration)
1Budker Institute of Nuclear Physics, Novosibirsk
2Chiba University, Chiba
3University of Cincinnati, Cincinnati, Ohio 45221
4T. Kościuszko Cracow University of Technology, Krakow
5Justus-Liebig-Universität Gießen, Gießen
6The Graduate University for Advanced Studies, Hayama
7Hanyang University, Seoul
8University of Hawaii, Honolulu, Hawaii 96822
9High Energy Accelerator Research Organization (KEK), Tsukuba
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
18École Polytechnique Fédérale de Lausanne (EPFL), Lausanne
19Faculty of Mathematics and Physics, University 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
34Saga University, Saga
35University of Science and Technology of China, Hefei
36Seoul National University, Seoul
37Sungkyunkwan University, Suwon
38University of Sydney, Sydney, New South Wales
39Tata Institute of Fundamental Research, Mumbai
40Toho University, Funabashi
41Tohoku Gakuin University, Tagajo
42Department of Physics, University of Tokyo, Tokyo
43Tokyo Institute of Technology, Tokyo
44Tokyo Metropolitan University, Tokyo
45Tokyo University of Agriculture and Technology, Tokyo
46Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
47Yonsei University, Seoul
Received 15 September 2008; revised 20 November 2008; published 13 January 2009
We have studied Bs0→Ds-π+ and Bs0→Ds∓K± decays using 23.6 fb-1 of data collected at the Υ(5S) resonance with the Belle detector at the KEKB e+e- collider. This highly pure Bs0→Ds-π+ sample is used to measure the branching fraction, B(Bs0→Ds-π+)=[3.67-0.33+0.35(stat)-0.42+0.43(syst)±0.49(fs)]×10-3 (fs=NBs(*)B̅ s(*)/Nbb̅ ) and the fractions of Bs0 event types at the Υ(5S) energy, in particular NBs*B̅ s*/NBs(*)B̅ s(*)=(90.1-4.0+3.8±0.2)%. We also determine the masses M(Bs0)=(5364.4±1.3±0.7) MeV/c2 and M(Bs*)=(5416.4±0.4±0.5) MeV/c2. In addition, we observe Bs0→Ds∓K± decays with a significance of 3.5σ and measure B(Bs0→Ds∓K±)=[2.4-1.0+1.2(stat)±0.3(syst)±0.3(fs)]×10-4.
© 2009 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.021801
DOI:
10.1103/PhysRevLett.102.021801
PACS:
13.25.Hw, 13.25.Gv, 14.40.Gx, 14.40.Nd
*Now at: Okayama University, Okayama.
|
|
