Improved measurement of branching fractions for ππ transitions among Υ(nS) states

S. R. Bhari, T. K. Pedlar,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,A. Powell, G. Wilkinson,K. M. Ecklund, V. Savinov,H. Mendez,J. Y. Ge,D. H. Miller, I. P. J. Shipsey,B. Xin, G. S. Adams,M. Anderson,J. P. Cummings,I. Danko,D. Hu,J. Napolitano,J. Insler,H. Muramatsu,E. H. Thorndike, F. Yang,M. Artuso,S. Blusk, S. Khalil,J. Li,S. Nisar, K. Randrianarivony,N. Sultana, T. Skwarnicki,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, R. Briere,T. Ferguson,G. Tatishvili,H. Vogel,M. Watkins,J. Rosner, J. Alexander,D. Cassel,J. Duboscq,R. Ehrlich,E. Engelson,L. Fields,R. Galik, L. Gibbons,R. Gray, S. Gray,D. Hartill, B. Heltsley,D. Hertz,J. Hunt,J. Kandaswamy,D. Kreinick,V. Kuznetsov,J. Ledoux,H. Mahlke-Krüger, D. Mohapatra, P. Onyisi,J. Patterson, D. Peterson, D. Riley, A. Ryd,A. Sadoff, X. Shi,S. Stroiney, W. Sun,T. Wilksen,S. Athar, R. Patel, J. Yelton,P. Rubin,B. Eisenstein, I. Karliner,S. Mehrabyan, N. Lowrey,M. Selen,E. White,J. Wiss, R. Mitchell,M. Shepherd,D. Besson

PHYSICAL REVIEW D（2009）

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摘要

Using samples of (5.93 +/- 0.10) x 10(6) Y(3S) decays and (9.11 +/- 0.14) x 10(6) Y(2S) decays collected with the CLEO detector, we report improved measurements of the following branching fractions: B(Y(3S) ---> Y(1S)pi(+)pi(-)) = (4.46 +/- 0.01 +/- 0.13)%, B(Y(2S) --> Y(1S)pi(+)pi(-)) = (18.02 +/- 0.02 +/- 0.61)%, B(Y(3S) --> Y(1S)pi(0)pi(0)) = (2.24 +/- 0.09 +/- 0.11)%, B(Y(2S) --> Y(1S)pi(0)pi(0)) = (8.43 +/- 0.16 +/- 0.42)%, and B(Y(3S) --> Y(2S) pi(0)pi (0)) = (1.82 +/- 0.09 +/- 0.12)%. In each case, the first uncertainty reported is statistical, while the second is systematic.

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elementary particles

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