Observation of Υ(2S)→ηΥ(1S) and Search for Related Transitions

Q. He,J. Insler,H. Muramatsu,C. S. Park, E. H. Thorndike,F. Yang,Marina Artuso, S. Blusk,S. Khalil,Li Jingyuan,R. Mountain,S. Nisar, K. Randrianarivony,N. Sultana, T. Skwarnicki,Sheldon Stone,J. C. Wang,L. M. Zhang, G. Bonvicini, D. Cinabro,M. Dubrovin,A. Lincoln,P. Naik,J. Rademacker, D. M. Asner, K. W. Edwards,J. Reed,R. A. Briere,Thomas Ferguson,G. Tatishvili,H. Vogel,M. E. Watkins,Jonathan L. Rosner,J. P. Alexander, D. G. Cassel, J. E. Duboscq,R. Ehrlich,L. Fields, R. S. Galik, L. K. Gibbons,R. Gray,S. W. Gray, D. L. Hartill, Brian Heltsley, D. Hertz,J. M. Hunt, J. Kandaswamy, D. L. Kreinick, V. E. Kuznetsov,J. Ledoux,H. Mahlke-Krüger,D. Mohapatra,P. U.E. Onyisi,J. R. Patterson, D. Peterson,D. Riley,A. Ryd, A. J. Sadoff, X. Shi,S. Stroiney,W. M. Sun,T. Wilksen,S. B. Athar,R. Patel, J. Yelton,P. Rubin, B. I. Eisenstein,I. Karliner,S. Mehrabyan,N. Lowrey,M. Selen,E. J. White,James E Wiss,R. E. Mitchell,M. R. Shepherd, D. Besson,T. K. Pedlar,J. Xavier,Daniel P Cronin-Hennessy,K. Y. Gao,J. Hietala,Y. Kubota,T. Klein, B. W. Lang,Ron Poling, A. W. Scott,P. Zweber,Sean A Dobbs,Z. Metreveli,Kamal K. Seth,Amiran Tomaradze,J. Libby,L. Martin,A. Powell,G. Wilkinson,K. M. Ecklund,W. Love,V. Savinov,H. Mendez,J. Y. Ge

Physical Review Letters（2008）

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摘要

We report the first observation of Y(2S) → ηY(1S), with a branching fraction Β = (2.1 +0.7 -0.6 (stat) ± 0.3(syst)) X 10 -4 and a statistical significance 5.3σ. Data were acquired with the CLEO III detector at the CESR e + e - symmetric collider. This is the first process observed involving a b-quark spin flip. For related transitions, 90% confidence limits in units of 10 -4 are Β(Y(2S) → π 0 Y(1S)) < 1.8, Β(Y(3S) → ηY(1S)) < 1.8, B(Y(3S) →π 0 Y(1S)) < 0.7, and Β(Y(3S) → π 0 Y(2S)) < 5.1.

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