Photon transitions in ψ(2S) decays to χcJ(1P) and ηc(1S)

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,J. Thaler,J. Williams,J. Wiss, K. Edwards,D. Besson,K. Gao,D. Gong,Y. Kubota,B. Lang,S. Li,R. Poling,A. Scott,A. Smith,C. Stepaniak,J. Urheim,Z. Metreveli,K. Seth, A. Tomaradze,P. Zweber,J. Ernst,A. Mahmood, H. Severini,D. Asner,S. Dytman,S. Mehrabyan,J. Mueller, V. Savinov,Z. Li,A. Lopez,H. Mendez,J. Ramirez, G. Huang,D. Miller, V. Pavlunin,B. Sanghi, E. Shibata,I. Shipsey,G. Adams,M. Chasse,M. Cravey,J. Cummings,I. Danko,J. Napolitano,D. Cronin-Hennessy, C. Park,W. Park,J. Thayer,E. Thorndike,T. Coan, Y. Gao,F. Liu,M. Artuso, C. Boulahouache,S. Blusk,J. Butt,E. Dambasuren,O. Dorjkhaidav,N. Menaa,R. Mountain,H. Muramatsu,R. Nandakumar, R. Redjimi,R. Sia,T. Skwarnicki,S. Stone,J. Wang, K. Zhang, S. Csorna,G. Bonvicini,D. Cinabro,M. Dubrovin,R. Briere,G. Chen,T. Ferguson,G. Tatishvili,H. Vogel,M. Watkins,N. Adam, J. Alexander,K. Berkelman,D. Cassel,J. Duboscq,K. Ecklund,R. Ehrlich,L. Fields,R. Galik, L. Gibbons,B. Gittelman,R. Gray, S. Gray,D. Hartill, B. Heltsley,D. Hertz,L. Hsu,C. Jones,J. Kandaswamy,D. Kreinick,V. Kuznetsov,H. Mahlke-Krüger,T. Meyer,P. Onyisi,J. Patterson, D. Peterson,J. Pivarski, D. Riley,J. Rosner, A. Ryd,A. Sadoff,H. Schwarthoff,M. Shepherd,W. Sun,J. Thayer,D. Urner,T. Wilksen,M. Weinberger

PHYSICAL REVIEW D（2004）

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摘要

We have studied the inclusive photon spectrum in psi(2S) decays using the CLEO III detector. We present the most precise measurements of electric dipole (E1) photon transition rates for psi(2S)-->gammachi(cJ)(1P) (J=0,1,2). We also confirm the hindered magnetic dipole (M1) transition, psi(2S)-->gammaeta(c)(1S). However, the direct M1 transition psi(2S)-->gammaeta(c)(2S) observed by the Crystal Ball as a narrow peak at a photon energy of 91 MeV is not found in our data.

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