Observation Of Upsilon(3s)->Tau(+),Tau(-) And Tests Of Lepton Universality In Upsilon Decays

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,P. Zweber,S. Dobbs,Z. Metreveli,K. Seth, A. Tomaradze,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, F. Yang,T. Coan, Y. Gao, F. Liu,M. Artuso,S. Blusk,J. Butt,N. Horwitz,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,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, 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

PHYSICAL REVIEW LETTERS（2007）

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摘要

Using data collected with the CLEO III detector at the CESR e(+)e(-) collider, we report on a first observation of the decay Y(3S) -> tau(+) tau(-), and precisely measure the ratio of branching fractions of Y(nS), n = 1, 2, 3, to tau(+) tau(-) and mu(+) mu(-) final states, finding agreement with expectations from lepton universality. We derive absolute branching fractions for these decays, and also set a limit on the influence of a low mass CP-odd Higgs boson in the decay of the Y(1S).

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