Charmonium decays to γπ0, γη, and γη′

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

PHYSICAL REVIEW D（2009）

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摘要

Using data acquired with the CLEO-c detector at the CESR e(+)e(-) collider, we measure branching fractions for J/psi, psi(2S), and psi(3770) decays to gamma pi(0), gamma eta, and gamma eta'. Defining R-n equivalent to B[psi(nS) -> gamma eta]/B[psi(nS) -> gamma eta'], we obtain R-1 = (21.1 +/- 0.9)% and, unexpectedly, an order of magnitude smaller limit, R-2 < 1.8% at 90% C.L. We also use J/psi -> gamma eta' events to determine branching fractions of improved precision for the five most copious eta' decay modes.

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