Observation Of Psi(3770)->Gamma Chi(C1)->Gamma Gamma J/Psi

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,A. Lincoln,R. Briere,G. Chen, J. Chen,T. Ferguson,G. Tatishvili,H. Vogel,M. Watkins,J. Rosner,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

PHYSICAL REVIEW LETTERS（2006）

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Abstract

From e(+)e(-) collision data acquired with the CLEO detector at the Cornell Electron Storage Ring, we observe the non-D (D) over bar decay psi(3770)->gamma chi(c1) with a statistical significance of 6.6 standard deviations, using the two-photon cascades to J/psi and J/psi ->center dot(+)center dot(-). We determine sigma(e(+)e(-)->psi(3770))xB(psi(3770)->gamma chi(c1))=(18.0 +/- 3.3 +/- 2.5) pb and branching fraction B(psi(3770)->gamma chi(c1))=(2.8 +/- 0.5 +/- 0.4)x10(-3). We set 90% C.L. upper limits for the transition to chi(c2) (chi(c0)): sigma xB < 5.7 pb (< 282 pb) and B < 0.9x10(-3) (< 44x10(-3)). We also determine Gamma(psi(3770)->gamma chi(c1))/Gamma(psi(3770)->pi(+)pi(-)J/psi)=1.5 +/- 0.3 +/- 0.3 (> 1.0 at 90% C.L.), which bears upon the interpretation of X(3872).

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Key words

standard deviation,statistical significance

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