Phys. Rev. D
79,
071101(R)
(2009)
[7 pages]
Measurement of the e+e-→J/ψcc̅ cross section at √s≈10.6 GeV
P. Pakhlov et al. The Belle Collaboration
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P. Pakhlov14, H. Aihara44, K. Arinstein1,32, T. Aushev19,14, A. M. Bakich39, V. Balagura14, E. Barberio22, A. Bay19, K. Belous13, V. Bhardwaj34, A. Bondar1,32, M. Bračko21,15, J. Brodzicka9, T. E. Browder8, M.-C. Chang5, P. Chang27, A. Chen25, B. G. Cheon7, R. Chistov14, S.-K. Choi50, Y. Choi38, M. Danilov14, M. Dash48, A. Drutskoy3, W. Dungel12, S. Eidelman1,32, D. Epifanov1,32, N. Gabyshev1,32, P. Goldenzweig3, B. Golob20,15, H. Ha17, B.-Y. Han17, K. Hayasaka23, H. Hayashii24, M. Hazumi9, Y. Horii43, Y. Hoshi42, W.-S. Hou27, Y. B. Hsiung27, H. J. Hyun18, T. Iijima23, K. Inami23, A. Ishikawa35, H. Ishino45,*, Y. Iwasaki9, N. J. Joshi40, D. H. Kah18, H. Kaji23, H. Kawai2, T. Kawasai30, H. Kichimi9, H. O. Kim18, Y. I. Kim18, K. Kinoshita3, B. R. Ko17, S. Korpar21,15, P. Križan20,15, P. Krokovny9, A. Kuzmin1,32, Y.-J. Kwon49, S.-H. Kyeong49, J. S. Lange6, M. J. Lee37, S. E. Lee37, T. Lesiak28,4, S.-W. Lin27, Y. Liu23, D. Liventsev14, R. Louvot19, F. Mandl12, A. Matyja28, S. McOnie39, H. Miyata30, Y. Miyazaki23, R. Mizuk14, Y. Nagasaka10, M. Nakao9, H. Nakazawa25, K. Nishimura8, O. Nitoh47, S. Ogawa41, T. Ohshima23, S. Okuno16, H. Ozaki9, G. Pakhlova14, H. Palka28, C. W. Park38, H. Park18, H. K. Park18, K. S. Park38, R. Pestotnik15, L. E. Piilonen48, A. Poluektov1,32, H. Sahoo8, Y. Sakai9, O. Schneider19, C. Schwanda12, K. Senyo23, M. E. Sevior22, M. Shapkin13, C. P. Shen8, J.-G. Shiu27, B. Shwartz1,32, J. B. Singh34, A. Sokolov13, S. Stanič31, M. Starič15, T. Sumiyoshi46, M. Tanaka9, G. N. Taylor22, Y. Teramoto33, I. Tikhomirov14, K. Trabelsi9, T. Tsuboyama9, S. Uehara9, T. Uglov14, Y. Unno7, S. Uno9, Y. Usov1,32, G. Varner8, K. Vervink19, A. Vinokurova1,32, C. H. Wang26, P. Wang11, Y. Watanabe16, R. Wedd22, E. Won17, B. D. Yabsley39, Y. Yamashita29, C. C. Zhang11, Z. P. Zhang36, V. Zhilich1,32, V. Zhulanov1,32, T. Zivko15, A. Zupanc15, and O. Zyukova1,32 (The Belle Collaboration)
1Budker Institute of Nuclear Physics, Novosibirsk, Russia
2Chiba University, Chiba, Japan
3University of Cincinnati, Cincinnati, Ohio 45221, USA
4T. Kościuszko Cracow University of Technology, Krakow, Poland
5Department of Physics, Fu Jen Catholic University, Taipei, Taiwan
6Justus-Liebig-Universität Gießen, Gießen, Germany
7Hanyang University, Seoul, Korea
8University of Hawaii, Honolulu, Hawaii 96822, USA
9High Energy Accelerator Research Organization (KEK), Tsukuba, Japan
10Hiroshima Institute of Technology, Hiroshima, Japan
11Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China
12Institute of High Energy Physics, Vienna, Austria
13Institute of High Energy Physics, Protvino, Russia
14Institute for Theoretical and Experimental Physics, Moscow, Russia
15J. Stefan Institute, Ljubljana, Slovenia
16Kanagawa University, Yokohama, Japan
17Korea University, Seoul, Korea
18Kyungpook National University, Taegu, Korea
19École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
20Faculty of Mathematics and Physics, University of Ljubljana, Ljubljana, Slovenia
21University of Maribor, Maribor, Slovenia
22University of Melbourne, School of Physics, Victoria 3010, Australia
23Nagoya University, Nagoya, Japan
24Nara Women’s University, Nara, Japan
25National Central University, Chung-li, Taiwan
26National United University, Miao Li, Taiwan
27Department of Physics, National Taiwan University, Taipei, Taiwan
28H. Niewodniczanski Institute of Nuclear Physics, Krakow, Poland
29Nippon Dental University, Niigata, Japan
30Niigata University, Niigata, Japan
31University of Nova Gorica, Nova Gorica, Slovenia
32Novosibirsk State University, Novosibirsk, Russia
33Osaka City University, Osaka, Japan
34Panjab University, Chandigarh, India
35Saga University, Saga, Japan
36University of Science and Technology of China, Hefei, China
37Seoul National University, Seoul, Korea
38Sungkyunkwan University, Suwon, Korea
39University of Sydney, Sydney, New South Wales, Australia
40Tata Institute of Fundamental Research, Mumbai, India
41Toho University, Funabashi, Japan
42Tohoku Gakuin University, Tagajo, Japan
43Tohoku University, Sendai, Japan
44Department of Physics, University of Tokyo, Tokyo, Japan
45Tokyo Institute of Technology, Tokyo, Japan
46Tokyo Metropolitan University, Tokyo, Japan
47Tokyo University of Agriculture and Technology, Tokyo, Japan
48IPNAS, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA
49Yonsei University, Seoul, Korea
50Gyeongsang National University, Chinju, Korea
Received 19 January 2009; published 16 April 2009
We present a new measurement of the e+e-→J/ψcc̅ cross section where the cc̅ pair can fragment either into charmed hadrons or a charmonium state. In the former case the J/ψ and a charmed hadron are reconstructed, while the latter process is measured using the recoil mass technique, which allows the identification of two-body final states without reconstruction of one of the charmonia. The measured e+e-→J/ψcc̅ cross section is (0.74±0.08+0.09/-0.08) pb, and the e+e-→J/ψXnon-cc̅ cross section is (0.43±0.09±0.09) pb. We note that the measured cross sections are obtained from a data sample with the multiplicity of charged tracks in the event larger than 4; corrections for the effect of this requirement are not performed as this cannot be done in a model-independent way. The analysis is based on a data sample with an integrated luminosity of 673 fb-1 recorded near the Υ(4S) resonance with the Belle detector at the KEKB e+e- asymmetric-energy collider.
© 2009 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.79.071101
DOI:
10.1103/PhysRevD.79.071101
PACS:
13.66.Bc, 12.38.Bx, 14.40.Gx
*Now at Okayama University, Okayama, Japan.
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