Search For Bottomonium States In Exclusive Radiative Upsilon(2s) Decays

Belle Collaboration,S. Sandilya,K. Trabelsi,G. B. Mohanty,I. Adachi,H. Aihara,D. M. Asner,T. Aushev,A. M. Bakich,A. Bala,V. Bhardwaj,B. Bhuyan,A. Bondar,G. Bonvicini, A. Bozek,M. Bračko,T. E. Browder,P. Chen,B. G. Cheon,K. Chilikin,R. Chistov,K. Cho,V. Chobanova,S. -K. Choi, Y. Choi, D. Cinabro,J. Dalseno, J. Dingfelder,Z. Doležal,A. Drutskoy,D. Dutta,S. Eidelman,H. Farhat,J. E. Fast,M. Feindt,T. Ferber,A. Frey,V. Gaur, N. Gabyshev,S. Ganguly, R. Gillard,Y. M. Goh,B. Golob,J. Haba, T. Hara, K. Hayasaka,H. Hayashii, Y. Hoshi, W. -S. Hou,Y. B. Hsiung, H. J. Hyun, T. Iijima,A. Ishikawa, R. Itoh, Y. Iwasaki,T. Julius,D. H. Kah,J. H. Kang,E. Kato, H. Kawai, T. Kawasaki, C. Kiesling,D. Y. Kim, H. O. Kim, J. B. Kim, J. H. Kim,Y. J. Kim, J. Klucar,B. R. Ko,P. Kodyš, S. Korpar,P. Križan,P. Krokovny, T. Kumita,A. Kuzmin,Y. -J. Kwon, J. S. Lange,S. -H. Lee, J. Li,Y. Li, Z. Q. Liu, D. Liventsev,P. Lukin,J. MacNaughton,D. Matvienko, K. Miyabayashi,H. Miyata, R. Mizuk,A. Moll,N. Muramatsu,R. Mussa, Y. Nagasaka, M. Nakao, M. Nayak,C. Ng,N. K. Nisar,S. Nishida,O. Nitoh,S. Ogawa, S. Okuno,C. Oswald,G. Pakhlova, C. W. Park,H. Park,H. K. Park,T. K. Pedlar, R. Pestotnik, M. Petrič,L. E. Piilonen,M. Ritter,M. Röhrken,A. Rostomyan,S. Ryu,H. Sahoo, T. Saito,K. Sakai, Y. Sakai, L. Santelj, T. Sanuki, Y. Sato, V. Savinov,O. Schneider, G. Schnell, D. Semmler, K. Senyo,M. E. Sevior, M. Shapkin, C. P. Shen, T. -A. Shibata,J. -G. Shiu, B. Shwartz, A. Sibidanov,F. Simon, Y. -S. Sohn,A. Sokolov,E. Solovieva, S. Stanič, M. Starič, M. Steder,T. Sumiyoshi,U. Tamponi,K. Tanida, G. Tatishvili,Y. Teramoto,T. Tsuboyama,M. Uchida, S. Uehara,T. Uglov, Y. Unno,S. Uno,P. Urquijo, S. E. Vahsen,C. Van Hulse, P. Vanhoefer, G. Varner,V. Vorobyev, M. N. Wagner,C. H. Wang, M. -Z. Wang, P. Wang,X. L. Wang,M. Watanabe,Y. Watanabe,J. Wiechczynski, K. M. Williams,E. Won,B. D. Yabsley,J. Yamaoka, Y. Yamashita, S. Yashchenko,C. Z. Yuan, Y. Yusa, C. C. Zhang, Z. P. Zhang,V. Zhilich, A. Zupanc

PHYSICAL REVIEW LETTERS（2013）

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摘要

We search for bottomonium states in Upsilon(2S) -> (b (b) over bar)Upsilon decays with an integrated luminosity of 24.7 fb(-1) recorded at the Upsilon(2S) resonance with the Belle detector at KEK, containing (157.8 +/- 3.6) x 10(6) Upsilon(2S) events. The (b (b) over bar) system is reconstructed in 26 exclusive hadronic final states composed of charged pions, kaons, protons, and K-0(S) mesons. We find no evidence for the state recently observed around 9975 MeV (X-b (b) over bar) in an analysis based on a data sample of 9.3 x 10(6) Upsilon(2S) events collected with the CLEO III detector. We set a 90% confidence level upper limit on the branching fraction B[Upsilon(2S) -> X-b (b) over bar Upsilon] x Sigma(i) B[X-b (b) over bar -> h(i)] < 4.9 x 10(-6), summed over the exclusive hadronic final states employed in our analysis. This result is an order of magnitude smaller than the measurement reported with CLEO data. We also set an upper limit for the eta(b)(1S) state of B[Upsilon(2S) -> eta(b)(1S)Upsilon] x Sigma B-i[eta(b)(1S) -> h(i)] < 3.7 x 10(-6).

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