Measurement Of The Eta(')-Meson Mass Using J/Psi ->Gamma Eta(')

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

PHYSICAL REVIEW LETTERS（2008）

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摘要

We measure the mass of the eta(') meson using psi(2S)->pi(+)pi(-)J/psi, J/psi ->gamma eta(') events acquired with the CLEO-c detector operating at the CESR e(+)e(-) collider. Using three decay modes, eta(')->rho(0)gamma, eta(')->pi(+)pi(-)eta with eta ->gamma gamma, and eta(')->pi(+)pi(-)eta with eta ->pi(+)pi(-)pi(0), we find M-eta(')=957.793 +/- 0.054 +/- 0.036 MeV, in which the uncertainties are statistical and systematic, respectively. This result is consistent with but substantially more precise than the current world average.

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