Measurement ofB0→J/ψη(′)and constraint on theη−η′mixing angle

M.-C. Chang, Y.-C. Duh,J.-Y. Lin, I. Adachi,K. Adamczyk,H. Aihara,D. M. Asner,T. Aushev,A. M. Bakich,V. Bhardwaj,B. Bhuyan, A. Bondar, A. Bozek, M. Bračko,J. Brodzicka,T. E. Browder,P. Chang,A. Chen,K.-F. Chen,P. Chen, B. G. Cheon, K. Chilikin,R. Chistov,I.-S. Cho,S.-K. Choi,Y. Choi,J. Dalseno,Z. Doležal,Z. Drásal,A. Drutskoy,S. Eidelman,J. E. Fast,V. Gaur,A. Garmash,Y. M. Goh,B. Golob,J. Haba,T. Hara, K. Hayasaka, H. Hayashii,Y. Horii, Y. Hoshi, W.-S. Hou,H. J. Hyun,T. Iijima,A. Ishikawa,R. Itoh,M. Iwabuchi, Y. Iwasaki,T. Iwashita,T. Julius,N. Katayama,T. Kawasaki, H. O. Kim, J. B. Kim,K. T. Kim, M. J. Kim,Y. J. Kim,K. Kinoshita, B. R. Ko,S. Koblitz,P. Kodyš,S. Korpar,P. Križan,P. Krokovny,T. Kuhr,R. Kumar,T. Kumita,Y.-J. Kwon, J. S. Lange,S.-H. Lee, J. Li,Y. Li,J. Libby,C. Liu, Z. Q. Liu, R. Louvot,S. McOnie,K. Miyabayashi,H. Miyata,Y. Miyazaki,R. Mizuk, G. B. Mohanty,A. Moll,N. Muramatsu,Y. Nagasaka,I. Nakamura, E. Nakano,M. Nakao,H. Nakazawa,Z. Natkaniec,S. Nishida,K. Nishimura,O. Nitoh,S. Ogawa, T. Ohshima,S. Okuno,S. L. Olsen,G. Pakhlova,C. W. Park,K. S. Park,T. K. Pedlar,T. Peng, R. Pestotnik, M. Petrič,L. E. Piilonen, M. Röhrken,S. Ryu,H. Sahoo,K. Sakai, Y. Sakai,O. Schneider,C. Schwanda,A. J. Schwartz,K. Senyo,M. E. Sevior, M. Shapkin, C. P. Shen, T.-A. Shibata, J.-G. Shiu, A. Sibidanov,F. Simon, P. Smerkol, Y.-S. Sohn,A. Sokolov,E. Solovieva, S. Stanič, M. Starič, M. Sumihama,T. Sumiyoshi, S. Tanaka,G. Tatishvili,Y. Teramoto,M. Uchida, S. Uehara,T. Uglov, Y. Unno,S. Uno,P. Urquijo,Y. Usov, G. Varner,V. Vorobyev,C. H. Wang,M.-Z. Wang,P. Wang,Y. Watanabe,K. M. Williams,E. Won,H. Yamamoto,Y. Yamashita,C. Z. Yuan,Y. Yusa, Z. P. Zhang,V. Zhilich,V. Zhulanov, A. Zupanc

Physical Review D(2012)

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摘要
We measure the branching fractions of B-0 -> J/psi eta((')) decays with the complete Belle data sample of 772 x 10(6) B (B) over bar events collected at the Y(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. The results for the branching fractions are: B(B-0 -> J/psi eta) = (12.3 +/-(1.8)(1.7)+/- 0.7) x 10(-6) and B(B-0 -> J/psi eta') < 7.4 x 10(-6) at 90% confidence level. The eta-eta' mixing angle is constrained to be less than 42.2 degrees at 90% confidence level.
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