Observation Of Psi(3770)->Pi Pi J/Psi And Measurement Of Gamma(Ee)[Psi(2s)]

N. Adam,J. Alexander,K. Berkelman,D. Cassel,V. Crede,J. Duboscq,K. Ecklund,R. Ehrlich,L. Fields,R. Galik,L. Gibbons,B. Gittelman,R. Gray, S. Gray,D. Hartill,B. Heltsley,D. Hertz,C. Jones,J. Kandaswamy,D. Kreinick,V. Kuznetsov,H. Mahlke-Krüger,T. Meyer,P. Onyisi,J. Patterson,D. Peterson,E. Phillips,J. Pivarski,D. Riley,A. Ryd,A. Sadoff,H. Schwarthoff,X. Shi,M. Shepherd,S. Stroiney, W. Sun,D. Urner,T. Wilksen,K. Weaver,M. Weinberger,S. Athar,P. Avery,L. Breva-Newell,R. Patel,V. Potlia,H. Stoeck,J. Yelton,P. Rubin,C. Cawlfield,B. Eisenstein,G. Gollin,I. Karliner,D. Kim,N. Lowrey,P. Naik,C. Sedlack,M. Selen,E. White,J. Williams,J. Wiss,D. Asner,K. Edwards, D. Besson,T. Pedlar,D. Cronin-Hennessy,K. Gao,D. Gong,J. Hietala,Y. Kubota,T. Klein,B. Lang,S. Li,R. Poling,A. Scott,A. Smith,S. Dobbs,Z. Metreveli,K. Seth,A. Tomaradze,P. Zweber,J. Ernst,H. Severini,S. Dytman,W. Love,S. Mehrabyan,J. Mueller,V. Savinov,Z. Li,A. Lopez,H. Mendez,J. Ramirez, G. Huang,D. Miller,V. Pavlunin,B. Sanghi,I. Shipsey,G. Adams,M. Anderson,J. Cummings,I. Danko,J. Napolitano,Q. He,H. Muramatsu,C. Park,E. Thorndike,T. Coan, Y. Gao,F. Liu,M. Artuso,C. Boulahouache,S. Blusk,J. Butt,O. Dorjkhaidav,J. Li,N. Menaa,R. Mountain,R. Nandakumar,K. Randrianarivony,R. Redjimi,R. Sia,T. Skwarnicki,S. Stone, J. Wang,K. Zhang,S. Csorna,G. Bonvicini,D. Cinabro,M. Dubrovin,R. Briere, G. Chen,J. Chen,T. Ferguson,G. Tatishvili,H. Vogel,M. Watkins,J. Rosner

PHYSICAL REVIEW LETTERS（2006）

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摘要

We observe signals for the decays psi(3770)-> XJ/psi from data acquired with the CLEO detector operating at the CESR e(+)e(-) collider with root s=3773 MeV. We measure the following branching fractions B(psi(3770)-> XJ/psi) and significances: (189 +/- 20 +/- 20)x10(-5) (11.6 sigma) for X=pi(+)pi(-), (80 +/- 25 +/- 16)x10(-5) (3.4 sigma) for X=pi(0)pi(0), and (87 +/- 33 +/- 22)x10(-5) (3.5 sigma) for X=eta, where the errors are statistical and systematic, respectively. The radiative return process e(+)e(-)->gamma psi(2S) populates the same event sample and is used to measure Gamma(ee)[psi(2S)]=(2.54 +/- 0.03 +/- 0.11) keV.

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