Measurement of the e+e-→π+π-J/ψ cross section via initial-state radiation at Belle

  • C. Z. Yuan
  • , C. P. Shen
  • , P. Wang
  • , S. McOnie
  • , I. Adachi
  • , H. Aihara
  • , V. Aulchenko
  • , T. Aushev
  • , S. Bahinipati
  • , V. Balagura
  • , E. Barberio
  • , I. Bedny
  • , U. Bitenc
  • , A. Bondar
  • , A. Bozek
  • , M. Bračko
  • , J. Brodzicka
  • , T. E. Browder
  • , M. C. Chang
  • , P. Chang
  • A. Chen, K. F. Chen, W. T. Chen, B. G. Cheon, R. Chistov, I. S. Cho, Y. Choi, J. Dalseno, M. Danilov, M. Dash, S. Eidelman, S. Fratina, N. Gabyshev, B. Golob, H. Ha, J. Haba, K. Hayasaka, H. Hayashii, M. Hazumi, D. Heffernan, T. Hokuue, Y. Hoshi, W. S. Hou, Y. B. Hsiung, H. J. Hyun, T. Iijima, K. Ikado, K. Inami, A. Ishikawa, R. Itoh, Y. Iwasaki, D. H. Kah, H. Kaji, J. H. Kang, N. Katayama, H. Kawai, T. Kawasaki, H. Kichimi, Y. J. Kim, K. Kinoshita, S. Korpar, P. Križan, P. Krokovny, R. Kumar, C. C. Kuo, A. Kuzmin, Y. J. Kwon, S. E. Lee, T. Lesiak, S. W. Lin, Y. Liu, D. Liventsev, F. Mandl, D. Marlow, A. Matyja, T. Medvedeva, W. Mitaroff, K. Miyabayashi, H. Miyake, H. Miyata, Y. Miyazaki, R. Mizuk, T. Mori, Y. Nagasaka, M. Nakao, Z. Natkaniec, S. Nishida, O. Nitoh, S. Ogawa, T. Ohshima, S. Okuno, S. L. Olsen, H. Ozaki, P. Pakhlov, G. Pakhlova, H. Palka, H. Park, K. S. Park, L. S. Peak, L. E. Piilonen, Y. Sakai, O. Schneider, J. Schümann, R. Seidl, K. Senyo, M. E. Sevior, M. Shapkin, H. Shibuya, J. G. Shiu, B. Shwartz, J. B. Singh, A. Sokolov, A. Somov, M. Starič, T. Sumiyoshi, F. Takasaki, M. Tanaka, G. N. Taylor, Y. Teramoto, I. Tikhomirov, S. Uehara, Y. Unno, S. Uno, Y. Usov, G. Varner, K. E. Varvell, K. Vervink, S. Villa, A. Vinokurova, C. C. Wang, C. H. Wang, X. L. Wang, Y. Watanabe, E. Won, B. D. Yabsley, A. Yamaguchi, Y. Yamashita, C. C. Zhang, Z. P. Zhang, V. Zhilich, V. Zhulanov, A. Zupanc

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452 Scopus citations

Abstract

The cross section for e+e-→π+π-J/ψ between 3.8 and 5.5GeV/c2 is measured using a 548fb-1 data sample collected on or near the Υ(4S) resonance with the Belle detector at KEKB. A peak near 4.25GeV/c2, corresponding to the so called Y(4260), is observed. In addition, there is another cluster of events at around 4.05GeV/c2. A fit using two interfering Breit-Wigner shapes describes the data better than one that uses only the Y(4260), especially for the lower-mass side of the 4.25 GeV enhancement.

Original languageEnglish (US)
Article number182004
JournalPhysical review letters
Volume99
Issue number18
DOIs
StatePublished - Nov 2 2007

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

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