Observation Of Psi(3770)->Gamma Chi(C0)

R. Briere, I. Brock, J. Chen,T. Ferguson,G. Tatishvili,H. Vogel,M. Watkins,J. Rosner,N. Adam, J. Alexander,K. Berkelman,D. Cassel,J. Duboscq,K. Ecklund,R. Ehrlich,L. Fields,R. Galik, L. Gibbons,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,J. Pivarski, D. Riley, A. Ryd, A. Sadoff,H. Schwarthoff, X. Shi,S. Stroiney,W. Sun,T. Wilksen,M. Weinberger,S. Athar,R. Patel,V. Potlia,H. Stoeck, J. Yelton,P. Rubin,C. Cawlfield,B. Eisenstein, I. Karliner, D. Kim, N. Lowrey,P. Naik,C. Sedlack,M. Selen,E. White,J. Wiss,M. Shepherd, D. Besson,T. Pedlar,D. Cronin-Hennessy,K. Gao,D. Gong,J. Hietala,Y. Kubota,T. Klein,B. Lang,R. Poling, A. Scott,A. Smith,S. Dobbs,Z. Metreveli,K. Seth, A. Tomaradze,P. Zweber, J. Ernst, H. Severini,S. Dytman,W. Love, V. Savinov,O. Aquines, Z. Li,A. Lopez,S. Mehrabyan,H. Mendez,J. Ramirez, G. Huang,D. Miller, V. Pavlunin,B. Sanghi, I. Shipsey,B. Xin,G. Adams,M. Anderson,J. Cummings,I. Danko,J. Napolitano,Q. He,J. Insler,H. Muramatsu, C. Park,E. Thorndike,T. Coan, Y. Gao, F. Liu,M. Artuso,S. Blusk, J. Butt, J. Li,N. Menaa,R. Mountain,S. Nisar, K. Randrianarivony, R. Redjimi,R. Sia, T. Skwarnicki,S. Stone, J. Wang, K. Zhang, S. Csorna,G. Bonvicini,D. Cinabro, M. Dubrovin,A. Lincoln,D. Asner, K. Edwards

PHYSICAL REVIEW D（2006）

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摘要

From e(+)e(-) collision data acquired with the CLEO-c detector at CESR, we search for the non-D (D) over bar decays psi(3770)->gamma chi(cJ), with chi(cJ) reconstructed in four exclusive decays modes containing charged pions and kaons. We report the first observation of such decays for J=0 with a branching ratio of (0.73 +/- 0.07 +/- 0.06)%. The rates for different J are consistent with the expectations assuming psi(3770) is predominantly a 1(3)D(1) state of charmonium, but only if relativistic corrections are applied.

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