Phys. Rev. D
77,
011105(R)
(2008)
[6 pages]
Observation of e+e-→K+K-J/ψ via initial-state radiation at Belle
C. Z. Yuan et al. Belle Collaboration
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C. Z. Yuan9, C. P. Shen9, P. Wang9, X. L. Wang9, I. Adachi7, H. Aihara42, K. Arinstein1, V. Aulchenko1, T. Aushev12,17, A. M. Bakich37, V. Balagura12, E. Barberio20, K. Belous11, U. Bitenc13, A. Bondar1, M. Bračko13,19, J. Brodzicka7, T. E. Browder6, Y. Chao25, A. Chen23, W. T. Chen23, B. G. Cheon5, R. Chistov12, I.-S. Cho47, Y. Choi36, J. Dalseno20, M. Danilov12, A. Das38, M. Dash46, S. Eidelman1, D. Epifanov1, N. Gabyshev1, B. Golob13,18, H. Ha15, J. Haba7, K. Hayasaka21, M. Hazumi7, D. Heffernan31, T. Hokuue21, Y. Hoshi40, W.-S. Hou25, H. J. Hyun16, K. Inami21, A. Ishikawa33, H. Ishino43, R. Itoh7, Y. Iwasaki7, D. H. Kah16, J. H. Kang47, H. Kawai2, T. Kawasaki28, H. Kichimi7, Y. J. Kim4, K. Kinoshita3, S. Korpar13,19, P. Križan13,18, P. Krokovny7, R. Kumar32, C. C. Kuo23, A. Kuzmin1, Y.-J. Kwon47, M. J. Lee35, S. E. Lee35, T. Lesiak26, S.-W. Lin25, D. Liventsev12, F. Mandl10, A. Matyja26, S. McOnie37, T. Medvedeva12, W. Mitaroff10, K. Miyabayashi22, H. Miyake31, H. Miyata28, Y. Miyazaki21, R. Mizuk12, D. Mohapatra46, G. R. Moloney20, Y. Nagasaka8, M. Nakao7, S. Nishida7, O. Nitoh45, S. Noguchi22, T. Nozaki7, S. Ogawa39, T. Ohshima21, S. Okuno14, S. L. Olsen6,9, P. Pakhlov12, G. Pakhlova12, C. W. Park36, H. Park16, L. S. Peak37, L. E. Piilonen46, H. Sahoo6, Y. Sakai7, O. Schneider17, J. Schümann7, K. Senyo21, M. E. Sevior20, M. Shapkin11, H. Shibuya39, J.-G. Shiu25, B. Shwartz1, J. B. Singh32, A. Somov3, S. Stanič29, M. Starič13, T. Sumiyoshi44, F. Takasaki7, K. Tamai7, M. Tanaka7, Y. Teramoto30, I. Tikhomirov12, S. Uehara7, T. Uglov12, Y. Unno5, S. Uno7, P. Urquijo20, Y. Usov1, G. Varner6, K. Vervink17, S. Villa17, C. C. Wang25, C. H. Wang24, Y. Watanabe14, E. Won15, B. D. Yabsley37, A. Yamaguchi41, Y. Yamashita27, M. Yamauchi7, C. C. Zhang9, Z. P. Zhang34, A. Zupanc13, and O. Zyukova1 (Belle Collaboration)
1Budker Institute of Nuclear Physics, Novosibirsk
2Chiba University, Chiba
3University of Cincinnati, Cincinnati, Ohio 45221
4The Graduate University for Advanced Studies, Hayama
5Hanyang University, Seoul
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 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
17École Polytechnique Fédérale de Lausanne (EPFL), Lausanne
18University of Ljubljana, Ljubljana
19University of Maribor, Maribor
20University of Melbourne, School of Physics, Victoria 3010
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
33Saga University, Saga
34University of Science and Technology of China, Hefei
35Seoul National University, Seoul
36Sungkyunkwan University, Suwon
37University of Sydney, Sydney, New South Wales
38Tata Institute of Fundamental Research, Mumbai
39Toho University, Funabashi
40Tohoku Gakuin University, Tagajo
41Tohoku University, Sendai
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 17 September 2007; published 16 January 2008
The process e+e-→K+K-J/ψ is observed for the first time via initial-state radiation. The cross section of e+e-→K+K-J/ψ for center-of-mass energies between threshold and 6.0 GeV is measured using 673 fb-1 of data collected with the Belle detector on and off the Υ(4S) resonance. No significant signal for Y(4260)→K+K-J/ψ is observed, and we determine B(Y(4260)→K+K-J/ψ)Γ(Y(4260)→e+e-)<1.2 eV/c2 at a 90% confidence level. We also find evidence for e+e-→KS0KS0J/ψ in the same data sample.
© 2008 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.77.011105
DOI:
10.1103/PhysRevD.77.011105
PACS:
13.66.Bc, 13.25.Gv, 14.40.Gx
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