Study of the hadronic transitions Υ(2S)→(η,π0)Υ(1S) at Belle

U. Tamponi, R. Mussa, I. Adachi, H. Aihara, D. M. Asner, V. Aulchenko, T. Aushev, A. M. Bakich, M. Barrett, B. Bhuyan, A. Bondar, A. Bozek, M. Bračko, T. E. Browder, A. Chen, P. Chen, B. G. Cheon, K. Chilikin, I. S. Cho, K. ChoY. Choi, J. Dalseno, Z. Doležal, Z. Drásal, D. Dutta, S. Eidelman, D. Epifanov, S. Esen, H. Farhat, J. E. Fast, A. Frey, V. Gaur, R. Gillard, Y. M. Goh, B. Golob, K. Hayasaka, Y. Horii, Y. Hoshi, H. J. Hyun, T. Iijima, A. Ishikawa, Y. Iwasaki, I. Jaegle, J. H. Kang, T. Kawasaki, H. O. Kim, J. H. Kim, K. T. Kim, M. J. Kim, Y. J. Kim, J. Klucar, B. R. Ko, P. Kodyš, S. Korpar, R. T. Kouzes, P. Križan, P. Krokovny, T. Kumita, A. Kuzmin, S. H. Lee, Y. Li, C. Liu, Y. Liu, Z. Q. Liu, D. Liventsev, H. Miyata, R. Mizuk, G. B. Mohanty, A. Moll, N. Muramatsu, M. Nakao, Z. Natkaniec, C. Ng, S. Nishida, O. Nitoh, S. Ogawa, T. Ohshima, S. Okuno, S. L. Olsen, Y. Onuki, P. Pakhlov, H. K. Park, K. S. Park, T. K. Pedlar, R. Pestotnik, M. Petrič, L. E. Piilonen, M. Röhrken, Y. Sakai, S. Sandilya, D. Santel, L. Santelj, T. Sanuki, O. Schneider, G. Schnell, C. Schwanda, K. Senyo, C. P. Shen, T. A. Shibata, J. G. Shiu, B. Shwartz, F. Simon, P. Smerkol, Y. S. Sohn, A. Sokolov, E. Solovieva, M. Starič, T. Sumiyoshi, K. Tanida, N. Taniguchi, G. Tatishvili, Y. Teramoto, K. Trabelsi, S. Uehara, S. Uno, C. Van Hulse, P. Vanhoefer, G. Varner, C. H. Wang, M. Z. Wang, P. Wang, X. L. Wang, M. Watanabe, Y. Watanabe, K. M. Williams, E. Won, B. D. Yabsley, Y. Yamashita, C. Z. Yuan, Z. P. Zhang, V. Zhilich, V. Zhulanov, A. Zupanc

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Abstract

We study the rare hadronic transitions Υ(2S)→Υ(1S)η and Υ(2S)→Υ(1S)π0 using a sample of 158×106Υ(2S) decays collected with the Belle detector at the KEKB asymmetric-energy e +e- collider. We measure the ratios of branching fractions (B)B(Υ(2S)→Υ(1S)η)B(Υ(2S)→Υ(1S) π+π-)=(1.99±0.14(stat)±0.11(syst)) ×10-3 and B(Υ(2S)→Υ(1S)π0)B(Υ(2S) →Υ(1S)π+π-)<2.3×10-4 at the 90% confidence level (CL). Assuming the value B(Υ(2S) →Υ(1S)π-π+)=(17.92±0.26)%, we obtain B(Υ(2S)→Υ(1S)η)=(3.57±0.25(stat)±0. 21(syst))×10-4 and B(Υ(2S)→Υ(1S)π0)<4. 1×10-5(90%CL).

Original languageEnglish
Article number011104
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume87
Issue number1
DOIs
Publication statusPublished - 2013 Jan 29

ASJC Scopus subject areas

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

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    Tamponi, U., Mussa, R., Adachi, I., Aihara, H., Asner, D. M., Aulchenko, V., Aushev, T., Bakich, A. M., Barrett, M., Bhuyan, B., Bondar, A., Bozek, A., Bračko, M., Browder, T. E., Chen, A., Chen, P., Cheon, B. G., Chilikin, K., Cho, I. S., ... Zupanc, A. (2013). Study of the hadronic transitions Υ(2S)→(η,π0)Υ(1S) at Belle. Physical Review D - Particles, Fields, Gravitation and Cosmology, 87(1), [011104]. https://doi.org/10.1103/PhysRevD.87.011104