Observation of anomalous upsilon(1S)pi+pi(-) and upsilon(2S)pi+pi(-) production near the upsilon(5S) resonance

• Published in: Physical review letters 2008-03, Vol.100 (11), p.112001-112001, Article 112001
• Main Authors: Chen, K-F, Hou, W-S, Shapkin, M, Sokolov, A, Adachi, I, Aihara, H, Arinstein, K, Aulchenko, V, Aushev, T, Bakich, A M, Balagura, V, Bay, A, Belous, K, Bhardwaj, V, Bitenc, U, Bondar, A, Bozek, A, Bracko, M, Brodzicka, J, Browder, T E, Chang, P, Chao, Y, Chen, A, Chen, W T, Chistov, R, Choi, Y, Dalseno, J, Danilov, M, Dash, M, Drutskoy, A, Eidelman, S, Gabyshev, N, Golob, B, Ha, H, Haba, J, Hayasaka, K, Hayashii, H, Hazumi, M, Heffernan, D, Hoshi, Y, Hsiung, Y B, Hyun, H J, Iijima, T, Inami, K, Ishikawa, A, Ishino, H, Itoh, R, Iwasaki, M, Iwasaki, Y, Kah, D H, Kang, J H, Kapusta, P, Katayama, N, Kawai, H, Kawasaki, T, Kichimi, H, Kim, H O, Kim, S K, Kim, Y J, Kinoshita, K, Korpar, S, Krizan, P, Krokovny, P, Kumar, R, Kuo, C C, Kwon, Y-J, Lange, J S, Lee, J S, Lee, M J, Lesiak, T, Limosani, A, Lin, S-W, Liu, Y, Liventsev, D, Mandl, F, McOnie, S, Medvedeva, T, Mitaroff, W, Miyabayashi, K, Miyake, H, Miyata, H, Miyazaki, Y, Mizuk, R, Moloney, G R, Nakao, M, Natkaniec, Z, Nishida, S, Nitoh, O, Ogawa, S, Ohshima, T, Okuno, S, Olsen, S L, Ostrowicz, W, Ozaki, H, Pakhlov, P, Pakhlova, G, Palka, H, Park, C W, Park, H, Park, K S
• Format: Article
• Language: English
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/PhysRevLett.100.112001

We report the first observation of e;{+}e;{-}-->Upsilon(1S)pi;{+}pi;{-}, Upsilon(2S)pi;{+}pi;{-}, and first evidence for e;{+}e;{-}-->Upsilon(3S)pi;{+}pi;{-}, Upsilon(1S)K+K-, near the peak of the Upsilon(5S) resonance at sqrt[s] approximately 10.87 GeV. The results are based on a data sample of 21.7 fb;{-1} collected with the Belle detector at the KEKB e;{+}e;{-} collider. Attributing the signals to the Upsilon(5S) resonance, the partial widths Gamma(Upsilon(5S)-->Upsilon(1S)pi;{+}pi;{-})=0.59+/-0.04(stat)+/-0.09(syst) MeV and Gamma(Upsilon(5S)-->Upsilon(2S)pi;{+}pi;{-})=0.85+/-0.07(stat)+/-0.16(syst) MeV are obtained from the observed cross sections. These values exceed by more than 2 orders of magnitude the previously measured partial widths for dipion transitions between lower Upsilon resonances.