J/Psi And Psi (2s) Radiative Transitions To Eta(C) (Vol 102, 011801, 2009)

R. E. Mitchell,M. R. Shepherd,D. Besson,T. K. Pedlar,D. Cronin-Hennessy,K. Y. Gao,J. Hietala,Y. Kubota,T. Klein,B. W. Lang,R. Poling,A. W. Scott,P. Zweber,S. Dobbs,Z. Metreveli,K. K. Seth,A. Tomaradze,J. Libby,A. Powell, G. Wilkinson,K. M. Ecklund,W. Love, V. Savinov,A. Lopez,H. Mendez,J. Ramirez,J. Y. Ge,D. H. Miller, I. P J Shipsey,B. Xin,G. S. Adams,M. Anderson,J. P. Cummings,I. Danko,D. Hu, B. Moziak,J. Napolitano,Q. He,J. Insler,H. Muramatsu,C. S. Park, E. H. Thorndike, F. Yang,M. Artuso,S. Blusk, S. Khalil,J. Li,R. Mountain,S. Nisar,K. Randrianarivony,N. Sultana, T. Skwarnicki, S. Stone,J. C. Wang, L. M. Zhang, G. Bonvicini,D. Cinabro,M. Dubrovin,A. Lincoln,P. Naik,J. Rademacker, D. M. Asner, K. W. Edwards,J. Reed,R. A. Briere,T. Ferguson,G. Tatishvili,H. Vogel,M. E. Watkins,J. L. Rosner, J. P. Alexander,D. G. Cassel,J. E. Duboscq, 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,D. Mohapatra, P. U E Onyisi,J. R. Patterson, D. Peterson, D. Riley, A. Ryd, A. J. Sadoff, X. Shi,S. Stroiney,W. M. Sun,T. Wilksen,S. B. Athar, R. Patel, J. Yelton,P. Rubin, B. I. Eisenstein,I. Karliner,S. Mehrabyan,N. Lowrey, M. Selen,E. J. White,J. Wiss

PHYSICAL REVIEW LETTERS（2011）

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Abstract

Using 24.5 million psi(2S) decays collected with the CLEO-c detector at CESR we present the most precise measurements of magnetic dipole transitions in the charmonium system. We measure B(psi(2S)->gamma eta_c) = (4.32+/-0.16+/-0.60)x10^-3, B(J/psi->gamma eta_c)/B(psi(2S)->gamma eta_c) = 4.59+/-0.23+/-0.64, and B(J/psi->gamma eta_c) = (1.98+/-0.09+/-0.30)%. We observe a distortion in the eta_c line shape due to the photon-energy dependence of the magnetic dipole transition rate. We find that measurements of the eta_c mass are sensitive to the line shape, suggesting an explanation for the discrepancy between measurements of the eta_c mass in radiative transitions and other production mechanisms.

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