Phys. Rev. Lett.
100,
142001
(2008)
[6 pages]
Observation of a Resonancelike Structure in the π+-ψ′ Mass Distribution in Exclusive B→Kπ+-ψ′ Decays
S.-K. Choi et al. Belle Collaboration
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S.-K. Choi6, S. L. Olsen8,10, I. Adachi9, H. Aihara42, V. Aulchenko1, T. Aushev18,13, T. Aziz39, A. M. Bakich38, V. Balagura13, I. Bedny1, U. Bitenc14, A. Bondar1, A. Bozek27, M. Bračko20,14, J. Brodzicka9, T. E. Browder8, P. Chang26, Y. Chao26, A. Chen24, K.-F. Chen26, W. T. Chen24, B. G. Cheon7, R. Chistov13, Y. Choi37, J. Dalseno21, M. Danilov13, M. Dash46, S. Eidelman1, N. Gabyshev1, B. Golob19,14, J. Haba9, T. Hara32, K. Hayasaka22, H. Hayashii23, M. Hazumi9, D. Heffernan32, Y. Hoshi41, W.-S. Hou26, H. J. Hyun17, T. Iijima22, K. Inami22, A. Ishikawa34, H. Ishino43, R. Itoh9, M. Iwasaki42, Y. Iwasaki9, D. H. Kah17, J. H. Kang47, N. Katayama9, H. Kawai2, T. Kawasaki29, H. Kichimi9, H. O. Kim17, S. K. Kim36, Y. J. Kim5, K. Kinoshita3, P. Križan19,14, P. Krokovny9, R. Kumar33, C. C. Kuo24, A. Kuzmin1, Y.-J. Kwon47, J. S. Lange4, J. S. Lee37, M. J. Lee36, S. E. Lee36, T. Lesiak27, A. Limosani21, S.-W. Lin26, Y. Liu5, D. Liventsev13, F. Mandl11, A. Matyja27, S. McOnie38, T. Medvedeva13, W. Mitaroff11, K. Miyabayashi23, H. Miyake32, H. Miyata29, Y. Miyazaki22, R. Mizuk13, G. R. Moloney21, E. Nakano31, M. Nakao9, S. Nishida9, O. Nitoh45, T. Nozaki9, S. Ogawa40, T. Ohshima22, S. Okuno15, H. Ozaki9, P. Pakhlov13, G. Pakhlova13, C. W. Park37, H. Park17, L. S. Peak38, R. Pestotnik14, L. E. Piilonen46, H. Sahoo8, Y. Sakai9, O. Schneider18, A. J. Schwartz3, K. Senyo22, M. Shapkin12, C. P. Shen10, H. Shibuya40, B. Shwartz1, J. B. Singh33, A. Somov3, S. Stanič30, M. Starič14, T. Sumiyoshi44, S. Y. Suzuki9, F. Takasaki9, K. Tamai9, M. Tanaka9, Y. Teramoto31, I. Tikhomirov13, S. Uehara9, T. Uglov13, Y. Unno7, S. Uno9, P. Urquijo21, G. Varner8, K. Vervink18, S. Villa18, C. H. Wang25, M.-Z. Wang26, P. Wang10, X. L. Wang10, Y. Watanabe15, R. Wedd21, E. Won16, B. D. Yabsley38, Y. Yamashita28, C. Z. Yuan10, Z. P. Zhang35, V. Zhulanov1, A. Zupanc14, and O. Zyukova1 (Belle Collaboration)
1Budker Institute of Nuclear Physics, Novosibirsk
2Chiba University, Chiba
3University of Cincinnati, Cincinnati, Ohio 45221
4Justus-Liebig-Universität Gießen, Gießen
5The Graduate University for Advanced Studies, Hayama
6Gyeongsang National University, Chinju
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
19University 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 23 October 2007; published 8 April 2008
A distinct peak is observed in the π±ψ′ invariant mass distribution near 4.43 GeV in B→Kπ±ψ′ decays. A fit using a Breit-Wigner resonance shape yields a peak mass and width of M=4433±4(stat)±2(syst) MeV and Γ=45-13+18(stat)-13+30(syst) MeV. The product branching fraction is determined to be B(B0→K∓Z±(4430))×B(Z±(4430)→π±ψ′)=(4.1±1.0(stat)±1.4(syst))×10-5, where Z±(4430) is used to denote the observed structure. The statistical significance of the observed peak is 6.5σ. These results are obtained from a 605 fb-1 data sample that contains 657×106 BB̅ pairs collected near the Υ(4S) resonance with the Belle detector at the KEKB asymmetric energy e+e- collider.
© 2008 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.142001
DOI:
10.1103/PhysRevLett.100.142001
PACS:
14.40.Gx, 12.39.Mk, 13.25.Hw
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