Phys. Rev. Lett.
91,
262001
(2003)
[6 pages]
Observation of a Narrow Charmoniumlike State in Exclusive B±→K±π+π-J/ψ Decays
S.-K. Choi et al. Belle Collaboration
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S.-K. Choi5, S. L. Olsen6, K. Abe7, T. Abe7, I. Adachi7, Byoung Sup Ahn14, H. Aihara43, K. Akai7, M. Akatsu20, M. Akemoto7, Y. Asano48, T. Aso47, V. Aulchenko1, T. Aushev11, A. M. Bakich38, Y. Ban31, S. Banerjee39, A. Bondar1, A. Bozek25, M. Bračko18,12, J. Brodzicka25, T. E. Browder6, P. Chang24, Y. Chao24, K.-F. Chen24, B. G. Cheon37, R. Chistov11, Y. Choi37, Y. K. Choi37, M. Danilov11, L. Y. Dong9, A. Drutskoy11, S. Eidelman1, V. Eiges11, J. Flanagan7, C. Fukunaga45, K. Furukawa7, N. Gabyshev7, T. Gershon7, B. Golob17,12, H. Guler6, R. Guo22, C. Hagner50, F. Handa42, T. Hara29, N. C. Hastings7, H. Hayashii21, M. Hazumi7, L. Hinz16, Y. Hoshi41, W.-S. Hou24, Y. B. Hsiung24,*, H.-C. Huang24, T. Iijima20, K. Inami20, A. Ishikawa20, R. Itoh7, M. Iwasaki43, Y. Iwasaki7, J. H. Kang52, S. U. Kataoka21, N. Katayama7, H. Kawai2, T. Kawasaki27, H. Kichimi7, E. Kikutani7, H. J. Kim52, Hyunwoo Kim14, J. H. Kim37, S. K. Kim36, K. Kinoshita3, H. Koiso7, P. Koppenburg7, S. Korpar18,12, P. Križan17,12, P. Krokovny1, S. Kumar30, A. Kuzmin1, J. S. Lange4,33, G. Leder10, S. H. Lee36, T. Lesiak25, S.-W. Lin24, D. Liventsev11, J. MacNaughton10, G. Majumder39, F. Mandl10, D. Marlow32, T. Matsumoto45, S. Michizono7, T. Mimashi7, W. Mitaroff10, K. Miyabayashi21, H. Miyake29, D. Mohapatra50, G. R. Moloney19, T. Nagamine42, Y. Nagasaka8, T. Nakadaira43, T. T. Nakamura7, M. Nakao7, Z. Natkaniec25, S. Nishida7, O. Nitoh46, T. Nozaki7, S. Ogawa40, Y. Ogawa7, K. Ohmi7, Y. Ohnishi7, T. Ohshima20, N. Ohuchi7, K. Oide7, T. Okabe20, S. Okuno13, W. Ostrowicz25, H. Ozaki7, H. Palka25, H. Park15, N. Parslow38, L. E. Piilonen50, H. Sagawa7, S. Saitoh7, Y. Sakai7, T. R. Sarangi49, M. Satapathy49, A. Satpathy7,3, O. Schneider16, A. J. Schwartz3, S. Semenov11, K. Senyo20, R. Seuster6, M. E. Sevior19, H. Shibuya40, T. Shidara7, B. Shwartz1, V. Sidorov1, N. Soni30, S. Stanič48,†, M. Starič12, A. Sugiyama34, T. Sumiyoshi45, S. Suzuki51, F. Takasaki7, K. Tamai7, N. Tamura27, M. Tanaka7, M. Tawada7, G. N. Taylor19, Y. Teramoto28, T. Tomura43, K. Trabelsi6, T. Tsukamoto7, S. Uehara7, K. Ueno24, Y. Unno2, S. Uno7, G. Varner6, K. E. Varvell38, C. C. Wang24, C. H. Wang23, J. G. Wang50, Y. Watanabe44, E. Won14, B. D. Yabsley50, Y. Yamada7, A. Yamaguchi42, Y. Yamashita26, H. Yanai27, Heyoung Yang36, J. Ying31, M. Yoshida7, C. C. Zhang9, Z. P. Zhang35, and D. Žontar17,12 (Belle Collaboration)
1Budker Institute of Nuclear Physics, Novosibirsk
2Chiba University, Chiba
3University of Cincinnati, Cincinnati, Ohio 45221
4University of Frankfurt, Frankfurt
5Gyeongsang National University, Chinju
6University of Hawaii, Honolulu, Hawaii 96822
7High Energy Accelerator Research Organization (KEK), Tsukuba
8Hiroshima Institute of Technology, Hiroshima
9Institute of High Energy Physics, Chinese Academy of Sciences, Beijing
10Institute of High Energy Physics, Vienna
11Institute for Theoretical and Experimental Physics, Moscow
12J. Stefan Institute, Ljubljana
13Kanagawa University, Yokohama
14Korea University, Seoul
15Kyungpook National University, Taegu
16Institut de Physique des Hautes Énergies, Université de Lausanne, Lausanne
17University of Ljubljana, Ljubljana
18University of Maribor, Maribor
19University of Melbourne, Victoria
20Nagoya University, Nagoya
21Nara Women’s University, Nara
22National Kaohsiung Normal University, Kaohsiung
23National Lien-Ho Institute of Technology, Miao Li
24Department of Physics, National Taiwan University, Taipei
25H. Niewodniczanski Institute of Nuclear Physics, Krakow
26Nihon Dental College, Niigata
27Niigata University, Niigata
28Osaka City University, Osaka
29Osaka University, Osaka
30Panjab University, Chandigarh
31Peking University, Beijing
32Princeton University, Princeton, New Jersey 08545
33RIKEN BNL Research Center, Upton, New York 11973
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, Bombay
40Toho University, Funabashi
41Tohoku Gakuin University, Tagajo
42Tohoku University, Sendai
43Department of Physics, University of Tokyo, Tokyo
44Tokyo Institute of Technology, Tokyo
45Tokyo Metropolitan University, Tokyo
46Tokyo University of Agriculture and Technology, Tokyo
47Toyama National College of Maritime Technology, Toyama
48University of Tsukuba, Tsukuba
49Utkal University, Bhubaneswer
50Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
51Yokkaichi University, Yokkaichi
52Yonsei University, Seoul
Received 8 September 2003; published 23 December 2003
We report the observation of a narrow charmoniumlike state produced in the exclusive decay process B±→K±π+π-J/ψ. This state, which decays into π+π-J/ψ, has a mass of 3872.0±0.6(stat)±0.5(syst) MeV, a value that is very near the MD0+MD*0 mass threshold. The results are based on an analysis of 152M B-B̅ events collected at the Υ(4S) resonance in the Belle detector at the KEKB collider. The signal has a statistical significance that is in excess of 10σ.
© 2003 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.91.262001
DOI:
10.1103/PhysRevLett.91.262001
PACS:
14.40.Gx, 12.39.Mk, 13.20.He
*On leave from Fermi National Accelerator Laboratory, Batavia, IL 60510. †On leave from Nova Gorica Polytechnic, Nova Gorica.
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