O ct 2 01 2 Precision measurements of branching fractions for ψ ′ → π 0 J / ψ and ηJ / ψ

M. Ablikim,M. Achasov,O. Albayrak,D. Ambrose,F. An,Q. An,J. Bai,Y. Ban,J. Becker,J. Bennett,M. Bertani,J. Bian,E. Boger,O. Bondarenko,I. Boyko,R. Briere,V. Bytev,X. Cai,O. Cakir,A. Calcaterra,G. Cao, S. Cetin,J. Chang,G. Chelkov,G. Chen, H. Chen, J. Chen, M. Chen,S. Chen,X. Chen,Y. Chen,H. Cheng,Y. Chu,F. Coccetti,D. Cronin-Hennessy,H. Dai,J. Dai,D. Dedovich,Z. Deng,A. Denig,I. Denysenko, M. Destefanis,W. Ding,Y. Ding, L. Dong,M. Dong,S. Du,J. Fang,S. Fang, L. Fava,F. Feldbauer, C. Feng,R. Ferroli, J. Fu,Y. Gao,C. Geng,K. Goetzen,W. Gong,W. Gradl,M. Greco, M. Gu,Y. Gu, Y. Guan,A. Guo,L. Guo, Y. Guo,Y. Han,F. Harris,K. He,M. He,Z. He,T. Held,Y. Heng,Z. Hou,H. Hu,J. Hu,T. Hu,G. Huang, G. Huang,J. Huang,X. Huang,Y. Huang,T. Hussain,C. Ji,Q. Ji, Q. Ji,X. Ji, X. Ji,L. Jiang,X. Jiang,J. Jiao,Z. Jiao,D. Jin,S. Jin,F. Jing,N. Kalantar-Nayestanaki,M. Kavatsyuk,M. Kornicer,W. Kuehn,W. Lai, J. Lange,C. Li,Cheng Li, Cui Li,D. Li,F. Li,G. Li, H. Li, J. Li,Lei Li, Q. Li,W. Li, W. Li,X. Li,X. Li,X. Li,X. Li, Z. Li,H. Liang, Y. Liang, Y. Liang, G. Liao,X. Liao, B. Liu, C. Liu, C. Liu, C. Liu,F. Liu,F. Liu, Feng. Liu,H. Liu,H. Liu,H. Liu, H. Liu, J. Liu, K. Liu, Kai Liu,P. Liu,Q. Liu, S. Liu,X. Liu, Y. Liu, Z. Liu, Zhiqiang Liu,Zhiqing Liu,H. Loehner,G. Lu, H. Lu,J. Lu, Q. Lu,X. Lu,Y. Lu, C. Luo, M. Luo,T. Luo,X. Luo,M. Lv,C. Ma, F. Ma,H. Ma,Q. Ma,S. Ma,T. Ma,X. Ma, Y. Ma,F. Maas,M. Maggiora,Q. A. Malik, Y. Mao,Z. Mao,J. Messchendorp,J. Min, T. Min,R. Mitchell,X. Mo, C. Morales,C. Motzko,N. Muchnoi, H. Muramatsu,Y. Nefedov,C. Nicholson,I. Nikolaev,Z. Ning,S. Olsen,Q. Ouyang,S. Pacetti,J. Park,M. Pelizaeus,H. Peng,K. Peters, J. Ping,R. Ping,R. Poling, E. Prencipe,M. Qi, S. Qian,C. Qiao,X. Qin,Y. Qin,Z. Qin,J. Qiu,K. H. Rashid,G. Rong,X. Ruan,A. Sarantsev,B. D. Schaefer,J. Schulze,M. Shao, C. Shen, X. Shen,H. Sheng,M. Shepherd,X. Song,S. Spataro,B. Spruck,D. Sun,G. Sun, J. Sun,S. Sun, Y. Sun,Y. Sun, Z. Sun, Z. Sun,C. Tang,X. Tang,I. Tapan,E. Thorndike,D. Toth,M. Ullrich,G. Varner,B. Wang,B. Wang,D. Wang, D. Wang,K. Wang,L. Wang, L. Wang,M. Wang,P. Wang, P. Wang,Q. Wang,Q. Wang,S. Wang,X. Wang, Y. Wang, Y. Wang, Y. Wang,Z. Wang,Z. Wang, Z. Wang,D. Wei,J. Wei, P. Weidenkaff,Q. Wen, S. Wen,M. Werner,U. Wiedner,L. Wu,N. Wu,S. Wu,W. Wu,Z. Wu,L. Xia, Z. Xiao, Y. Xie, Q. L. Xiu, G. Xu, G. Xu,H. Xu, Q. Xu,X. Xu,Z. Xu, F. Xue,Z. Xue,L. Yan,W. Yan,Y. Yan, H. Yang, Y. Yang, Y. Yang,H. Ye, M. Ye,M. Ye,B. Yu, C. Yu,H. Yu,J. Yu, S. Yu,C. Yuan,Y. Yuan,A. Zafar,A. Zallo,Y. Zeng,B. Zhang,B. Zhang, C. Zhang, C. Zhang,D. Zhang,H. Zhang,H. Zhang, J. Zhang, J. Zhang,J. Zhang, J. Zhang, S. Zhang, X. Zhang, X. Zhang,Y. Zhang,Y. Zhang, Y. Zhang, Z. Zhang, Z. Zhang,G. Zhao,H. Zhao, J. Zhao, K. Zhao,Lei Zhao,Ling Zhao, M. Zhao

semanticscholar(2018)

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摘要
We present a precision study of the ψ → π0J/ψ and ηJ/ψ decay modes. The measurements are obtained using 106×106 ψ events accumulated with the BESIII detector at the BEPCII e+e− collider operating at a center-of-mass energy corresponding to the ψ mass. We obtain B(ψ′ → π0J/ψ) = (1.26 ± 0.02 (stat.) ± 0.03 (syst.))× 10−3 and B(ψ′ → ηJ/ψ) = (33.75 ± 0.17 (stat.) ± 0.86 (syst.))× 10−3. The branching fraction ratio R = B(ψ →πJ/ψ) B(ψ→ηJ/ψ) is determined to be (3.74 ± 0.06 (stat.) ± 0.04 (syst.)) × 10−2. The precision of these measurements of B(ψ′ → π0J/ψ) and R represent a significant improvement over previously published values. PACS numbers: 13.25.Gv, 13.20.Gd
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