Observation Of Upsilon(2s)->Eta Upsilon(1s) And Search For Related Transitions

Q. He,J. Insler,H. Muramatsu,C. S. Park,E. H. Thorndike, F. Yang,M. Artuso,S. Blusk, S. Khalil,J. Li,R. Mountain,S. Nisar, K. Randrianarivony,N. Sultana,T. Skwarnicki,S. 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,T. Ferguson, G. Tatishvili,H. Vogel,M. E. Watkins,J. L. Rosner, J. P. Alexander, D. G. Cassel,J. E. Duboscq, R. Ehrlich,R. S. Galik, L. Gibbons,R. Gray,S. W. Gray,D. L. Hartill, B. K. Heltsley,D. Hertz, J. M. Hunt, J. Kandaswamy,D. L. Kreinick,V. E. Kuznetsov,J. Ledoux, H. Mahlke-Kruger, 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,J. Wiss, R. E. Mitchell,M. R. Shepherd, D. Besson, T. K. Pedlar, J. V. Xavier, D. Cronin-Hennessy,K. Y. Gao,J. Hietala,Y. Kubota,T. Klein, B. W. Lang, R. Poling,A. W. Scott,P. Zweber,S. Dobbs,Z. Metreveli, K. K. Seth, A. Tomaradze, J. Libby,L. Martin, V. Savinov,H. Mendez, J. Y. Ge, D. H. Miller, I. P. J. Shipsey,B. Xin,G. S. Adams,M. Anderson,I. Danko,D. Hu,J. Napolitano,G. Adams,M. Anderson,J. Cummings,I. Danko,D. Hu,B. Moziak,J. Napolitano

Physical review letters（2008）

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摘要

We report the first observation of Upsilon(2S)->eta Upsilon(1S), with a branching fraction B=(2.1(-0.6)(+0.7)(stat)+/- 0.3(syst))x10(-4) and a statistical significance 5.3 sigma. 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 B(Upsilon(2S)->pi(0)Upsilon(1S))< 1.8, B(Upsilon(3S)->eta Upsilon(1S))< 1.8, B(Upsilon(3S)->pi(0)Upsilon(1S))< 0.7, and B(Upsilon(3S)->pi(0)Upsilon(2S))< 5.1.

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