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Solovieva, E. Won, F. Simon, G. B. Mohanty, G. Schnell, G. Tatishvili, G. Varner, H. Aihara, H. Farhat, H. J. Hyun, H. K. Park, H. Miyata, H. O. Kim, I. Adachi, I. Jaegle, I.-S. Cho, J. Dalseno, J. E. Fast, J.-G. Shiu, J. H. Kang, J. H. Kim, J. Klucar, K. Chilikin, K. Cho, K. Hayasaka, K. M. Williams, K. Senyo, K. S. Park, K. Tanida, K. T. Kim, K. Trabelsi, L. E. Piilonen, L. Santelj, M. Barrett, M. Bra\\v, M. J. Kim, M. Nakao, M. Petri\\v, M. R\\\"ohrken, M. Stari\\v, M. Watanabe, M.-Z. Wang, N. Muramatsu, N. Taniguchi, O. Nitoh, O. Schneider, P. Chen, P. Kody\\v, P. Kri\\v, P. Krokovny, P. Pakhlov, P. Smerkol, P. Vanhoefer, P. Wang, R. Gillard, R. Mizuk, R. Mussa, R. Pestotnik, R. T. Kouzes, S. Eidelman, S. Esen, S.-H. Lee, S. Korpar, S. L. Olsen, S. Nishida, S. Ogawa, S. Okuno, S. Sandilya, S. Uehara, S. Uno, T.-A. Shibata, T. Aushev, T. E. Browder, T. Iijima, T. Kawasaki, T. K. Pedlar, T. Kumita, T. Ohshima, T. Sanuki, T. Sumiyoshi, V. Aulchenko, V. Gaur, V. Zhilich, V. Zhulanov, X. L. Wang, Y. Choi, Y. Horii, Y. Hoshi, Y. Iwasaki, Y. J. Kim, Y. Li, Y. Liu, Y. M. Goh, Y. Onuki, Y. Sakai, Y.-S. Sohn, Y. Teramoto, Y. Watanabe, Y. Yamashita, Z. Dole\\v, Z. Dr\\'asal, Z. Natkaniec, Z. P. Zhang, Z. Q. Liu","submitted_at":"2012-10-25T17:16:30Z","abstract_excerpt":"We study the rare hadronic transitions $\\Upsilon(2S)\\rightarrow \\Upsilon(1S)\\eta$ and $\\Upsilon(2S)\\rightarrow \\Upsilon(1S)\\pi^0$ using a sample of 158 $\\times 10^6$ $\\Upsilon(2S)$ decays collected with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. We observe the $\\eta$ meson decay to $\\gamma\\gamma$ and $\\pi^+\\pi^-\\pi^0$ final states; the $\\Upsilon(1S)$ is reconstructed in the $\\mu^+\\mu^-$ and $e^+e^-$ decay modes. 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