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First Observation of the Decay B0->psi(2S)pi0

V. Chobanova,J. Dalseno, C. Kiesling,A. Abdesselam,I. Adachi,H. Aihara,D. M. Asner,T. Aushev,R. Ayad,V. Babu,I. Badhrees,S. Bahinipati, A. M. Bakich,E. Barberio,P. Behera,V. Bhardwaj,B. Bhuyan, J. Biswal,A. Bobrov,A. Bozek,M. Bračko,T. E. Browder,D. Červenkov,V. Chekelian,A. Chen,B. G. Cheon,R. Chistov,K. Cho,Y. Choi,D. Cinabro,N. Dash,Z. Doležal,Z. Drásal,A. Drutskoy, S. Eidelman,H. Farhat,J. E. Fast,T. Ferber,B. G. Fulsom,V. Gaur,N. Gabyshev,A. Garmash,R. Gillard,Y. M. Goh,P. Goldenzweig,B. Golob,O. Grzymkowska,J. Haba,T. Hara,K. Hayasaka,H. Hayashii,W. -S. Hou,T. Iijima,K. Inami,A. Ishikawa,Y. Iwasaki,I. Jaegle,H. B. Jeon,D. Joffe,K. K. Joo,T. Julius,E. Kato,P. Katrenko, T. Kawasaki,D. Y. Kim,H. J. Kim, J. B. Kim, K. T. Kim,M. J. Kim,S. H. Kim,Y. J. Kim,K. Kinoshita, P. Kodyš, S. Korpar, P. Križan,P. Krokovny, T. Kuhr, R. Kumar,T. Kumita,A. Kuzmin,Y. -J. Kwon,I. S. Lee,H. Li,L. Li,Y. Li,L. Li Gioi,J. Libby,D. Liventsev,M. Masuda,D. Matvienko,H. Miyata, R. Mizuk,G. B. Mohanty,S. Mohanty,A. Moll,H. K. Moon,T. Mori, R. Mussa,E. Nakano,M. Nakao,T. Nanut,Z. Natkaniec,M. Nayak,N. K. Nisar,S. Nishida, S. Ogawa,P. Pakhlov,G. Pakhlova,B. Pal,C. W. Park,H. Park,S. Paul, T. K. Pedlar, R. Pestotnik,M. Petrič,L. E. Piilonen,C. Pulvermacher,J. Rauch,E. Ribežl,M. Ritter,S. Ryu,H. Sahoo,Y. Sakai,S. Sandilya,T. Sanuki,V. Savinov,T. Schlüter, O. Schneider,G. Schnell,C. Schwanda,A. J. Schwartz,Y. Seino,K. Senyo,O. Seon,M. E. Sevior, V. Shebalin,T. -A. Shibata,J. -G. Shiu,B. Shwartz,F. Simon,J. B. Singh,Y. -S. Sohn,A. Sokolov,E. Solovieva,M. Starič,J. Stypula,M. Sumihama, K. Sumisawa,T. Sumiyoshi,U. Tamponi,Y. Teramoto,K. Trabelsi,M. Uchida,S. Uehara,T. Uglov,Y. Unno,S. Uno,P. Urquijo,Y. Usov,C. Van Hulse,P. Vanhoefer,G. Varner,A. Vinokurova,V. Vorobyev, M. N. Wagner,C. H. Wang,M. -Z. Wang,P. Wang,X. L. Wang,M. Watanabe,Y. Watanabe,K. M. Williams,E. Won,J. Yamaoka,S. Yashchenko,H. Ye,J. Yelton,C. Z. Yuan,Y. Yusa, Z. P. Zhang,V. Zhilich,V. Zhulanov,A. Zupanc

PHYSICAL REVIEW D(2015)

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摘要
We report a measurement of the $B^0\rightarrow\psi(2S)\pi^0$ branching fraction based on the full $\Upsilon(4S)$ data set of $772\times10^{6}$ $B\bar{B}$ pairs collected by the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. We obtain $B(B^0\rightarrow\psi(2S)\pi^0) = (1.17\pm0.17\text{(stat)}\pm0.08\text{(syst)})\times10^{-5}$. The result has a significance of 7.2 standard deviations and is the first observation of the decay $B^0\rightarrow\psi(2S)\pi^0$.
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