CLEO 09-04 Search for ψ ( 2 S ) → γη c ( 2 S ) via fully reconstructed η c ( 2 S ) decays

D. Cronin-Hennessy,K. Y. Gao,D. T. Gong,J. Hietala,Y. Kubota,T. Klein, R. Poling,P. Zweber,S. Dobbs,Z. Metreveli, K. K. Seth, B. J. Y. Tan,A. Tomaradze,J. Libby,L. Martin,A. Powell,C. Thomas, G. Wilkinson,H. Mendez, J. Y. Ge,D. H. Miller,I. P. J. Shipsey,B. Xin, G. S. Adams,D. Hu, B. Moziak,J. Napolitano,K. M. Ecklund,Q. He,J. Insler,H. Muramatsu,C. S. Park, E. H. Thorndike,F. Yang,M. Artuso,S. Blusk,S. Khalil,R. Mountain, K. Randrianarivony, T. Skwarnicki, S. Stone,J. C. Wang,L. M. Zhang, G. Bonvicini,D. Cinabro,M. Dubrovin,A. Lincoln,M. J. Smith, P. Zhou, J. Zhu,P. Naik, J. Rademacker,D. M. Asner, K. W. Edwards,J. Reed, A. N. Robichaud,G. Tatishvili,E. J. White, R. A. Briere, H. Vogel,P. U. E. Onyisi,J. L. Rosner,J. P. Alexander, D. G. Cassel,R. Ehrlich,L. Fields, R. S. Galik, L. Gibbons,R. Gray,S. W. Gray, D. L. Hartill, B. K. Heltsley,D. Hertz, J. M. Hunt, J. Kandaswamy, D. L. Kreinick,V. E. Kuznetsov,J. Ledoux, H. Mahlke-Krüger,J. R. Patterson, D. Peterson, D. Riley, A. Ryd, A. J. Sadoff, X. Shi,S. Stroiney,W. M. Sun,T. Wilksen, J. Yelton,P. Rubin,N. Lowrey,S. Mehrabyan,M. Selen,J. Wiss,M. Kornicer,R. E. Mitchell,M. R. Shepherd, C. Tarbert,D. Besson,T. K. Pedlar,J. Xavier

semanticscholar(2010)

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摘要
We report a search for the decay ψ(2S) → γηc(2S) in a sample of 25.9 × 106 ψ(2S) events collected with the CLEO-c detector. No signals are observed in any of the 11 exclusive ηc(2S) decay modes studied, or in their sum. Product branching fraction upper limits are determined as a function of Γ[ηc(2S)] for the 11 individual modes.
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