Upsilon(1S)->gamma+f2'(1525); f2'(1525)->K0sK0s decays

The CLEO Collaboration,D. Besson,D. P. Hogan,T. K. Pedlar,D. Cronin-Hennessy,J. Hietala,P. Zweber,S. Dobbs,Z. Metreveli,K. K. Seth, A. Tomaradze,T. Xiao, S. Brisbane,L. Martin,A. Powell, P. Spradlin, G. Wilkinson,H. Mendez, J. Y. Ge,D. H. Miller,I. P. J. Shipsey,B. Xin,G. S. Adams,D. Hu,B. Moziak,J. Napolitano,K. M. Ecklund,J. Insler,H. Muramatsu,C. S. Park, L. J. Pearson,E. H. Thorndike, F. Yang,S. Ricciardi,C. Thomas,M. Artuso,S. Blusk,R. Mountain, T. Skwarnicki,S. Stone,J. C. Wang,L. M. Zhang, G. Bonvicini,D. Cinabro,A. Lincoln,M. J. Smith, P. Zhou,J. Zhu,P. Naik, J. Rademacker,D. M. Asner,K. W. Edwards, K. Randrianarivony, G. Tatishvili,R. A. Briere,H. Vogel,P. U. E. Onyisi, J. L. Rosner, J. P. Alexander,D. G. Cassel,S. Das, R. Ehrlich,L. Fields, L. Gibbons,S. W. Gray,D. L. Hartill,B. K. Heltsley,D. L. Kreinick,V. E. Kuznetsov,J. R. Patterson, D. Peterson, D. Riley, A. Ryd,A. J. Sadoff, X. Shi,W. M. Sun, J. Yelton,P. Rubin, N. Lowrey,S. Mehrabyan, M. Selen, J. Wiss,J. Libby,M. Kornicer, R. E. Mitchell, C. M. Tarbert

Physical Review D（2011）

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摘要

We report on a study of exclusive radiative decays of the Upsilon(1S) resonance into a final state consisting of a photon and two K0s candidates. We find evidence for a signal for Upsilon(1S)->gamma f_2'(1525); f_2'(1525)->K0sK0s, at a rate (4.0+/-1.3+/-0.6)x10^{-5}, consistent with previous observations of Upsilon(1S)->gamma f_2'(1525); f_2'(1525)->K+K-, and isospin. Combining this branching fraction with existing branching fraction measurements of Upsilon(1S)->gamma f_2'(1525) and J/psi->gamma f_2'(1525), we obtain the ratio of branching fractions: B(Upsilon(1S)->gamma f_2'(1525))/B(J/psi->gamma f_2'(1525))=0.09+/-0.02, approximately consistent with expectations based on soft collinear effective theory.

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