Observation of exclusive Υ(1S) and Υ(2S) decays into light hadrons

C. P. Shen, C. Z. Yuan, T. Iijima, I. Adachi, H. Aihara, D. M. Asner, T. Aushev, A. M. Bakich, A. Bay, K. Belous, B. Bhuyan, M. Bischofberger, G. Bonvicini, A. Bozek, M. Bračko, T. E. Browder, M. C. Chang, P. Chang, A. Chen, P. ChenB. G. Cheon, K. Chilikin, R. Chistov, I. S. Cho, K. Cho, S. K. Choi, Y. Choi, J. Dalseno, Z. Doleåal, Z. Drásal, S. Eidelman, J. E. Fast, V. Gaur, N. Gabyshev, Y. M. Goh, B. Golob, J. Haba, H. Hayashii, Y. Horii, Y. Hoshi, W. S. Hou, Y. B. Hsiung, H. J. Hyun, K. Inami, A. Ishikawa, R. Itoh, M. Iwabuchi, Y. Iwasaki, T. Iwashita, T. Julius, J. H. Kang, T. Kawasaki, C. Kiesling, B. H. Kim, H. O. Kim, J. B. Kim, J. H. Kim, M. J. Kim, Y. J. Kim, K. Kinoshita, B. R. Ko, S. Koblitz, P. Kodyå, S. Korpar, R. T. Kouzes, P. Kriåan, P. Krokovny, R. Kumar, T. Kumita, A. Kuzmin, Y. J. Kwon, S. H. Lee, J. Li, Y. Li, J. Libby, C. Liu, Y. Liu, Z. Q. Liu, R. Louvot, S. McOnie, K. Miyabayashi, H. Miyata, G. B. Mohanty, D. Mohapatra, A. Moll, N. Muramatsu, E. Nakano, M. Nakao, Z. Natkaniec, S. Nishida, K. Nishimura, O. Nitoh, S. Ogawa, T. Ohshima, S. Okuno, S. L. Olsen, P. Pakhlov, G. Pakhlova, C. W. Park, H. Park, H. K. Park, T. K. Pedlar, R. Pestotnik, M. Petrič, L. E. Piilonen, M. Ritter, H. Sahoo, Y. Sakai, D. Santel, T. Sanuki, Y. Sato, O. Schneider, C. Schwanda, K. Senyo, O. Seon, M. E. Sevior, M. Shapkin, V. Shebalin, T. A. Shibata, J. G. Shiu, B. Shwartz, A. Sibidanov, F. Simon, P. Smerkol, Y. S. Sohn, A. Sokolov, E. Solovieva, M. Starič, M. Sumihama, T. Sumiyoshi, G. Tatishvili, Y. Teramoto, M. Uchida, S. Uehara, T. Uglov, Y. Unno, S. Uno, P. Urquijo, Y. Usov, P. Vanhoefer, G. Varner, C. H. Wang, P. Wang, X. L. Wang, M. Watanabe, Y. Watanabe, K. M. Williams, E. Won, B. D. Yabsley, Y. Yamashita, C. C. Zhang, Z. P. Zhang, V. Zhilich, V. Zhulanov, A. Zupanc

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Abstract

Using samples of 102×106 Υ(1S) and 158×106 Υ(2S) events collected with the Belle detector, we study exclusive hadronic decays of these two bottomonium resonances to the three-body final states Ï•K +K -, ωπ +π - and K *0(892)K -π +, and to the two-body Vector-Tensor states (Ï•f2′(1525), ωf 2(1270), ρa 2(1320) and K *0(892)K̄2*0(1430)) and Axial-vector-Pseudoscalar (K 1(1270) +K -, K 1(1400) +K - and b 1(1235) +π -) states. Signals are observed for the first time in the Υ(1S)→Ï•K +K -, ωπ +π -, K *0K -π +, K *0K2*0 and Υ(2S)→Ï•K +K -, K *0K -π + decay modes. Branching fractions are determined for all the processes, while 90% confidence level upper limits are established on the branching fractions for the modes with a statistical significance less than 3σ. The ratios of the branching fractions of Υ(2S) and Υ(1S) decays into the same final state are used to test a perturbative QCD prediction for OZI-suppressed bottomonium decays.

Original languageEnglish
Article number031102
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume86
Issue number3
DOIs
Publication statusPublished - 2012 Aug 15

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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    Shen, C. P., Yuan, C. Z., Iijima, T., Adachi, I., Aihara, H., Asner, D. M., Aushev, T., Bakich, A. M., Bay, A., Belous, K., Bhuyan, B., Bischofberger, M., Bonvicini, G., Bozek, A., Bračko, M., Browder, T. E., Chang, M. C., Chang, P., Chen, A., ... Zupanc, A. (2012). Observation of exclusive Υ(1S) and Υ(2S) decays into light hadrons. Physical Review D - Particles, Fields, Gravitation and Cosmology, 86(3), [031102]. https://doi.org/10.1103/PhysRevD.86.031102