High-statistics study of (2S)→π+π-(1S)

D. Besson, J. Green, R. G. Hicks, R. Namjoshi, F. Sannes, P. Skubic, A. Snyder, R. Stone, A. Chen, M. Goldberg, N. Horwitz, A. Jawahery, P. Lipari, G. C. Moneti, C. G. Trahern, H. Van Hecke, M. S. Alam, S. E. Csorna, L. Garren, M. D. MestayerR. S. Panvini, Xia Yi, P. Avery, C. Bebek, K. Berkelman, D. G. Cassel, J. W. DeWire, R. Ehrlich, T. Ferguson, R. Galik, M. G D Gilchriese, B. Gittelman, M. Halling, D. L. Hartill, S. Holzner, M. Ito, J. Kandaswamy, D. L. Kreinick, Y. Kubota, N. B. Mistry, F. Morrow, E. Nordberg, M. Ogg, A. Silverman, P. C. Stein, S. Stone, D. Weber, R. Wilcke, A. J. Sadoff, R. Giles, J. Hassard, M. Hempstead, K. Kinoshita, W. W. MacKay, F. M. Pipkin, Richard Wilson, P. Haas, T. Jensen, H. Kagan, R. Kass, S. Behrends, K. Chadwick, J. Chauveau, T. Gentile, Jan M. Guida, Joan A. Guida, A. C. Melissinos, S. L. Olsen, G. Parkhurst, D. Peterson, R. Poling, C. Rosenfeld, E. H. Thorndike, P. Tipton

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64 Scopus citations

Abstract

A detailed investigation of the decay (2S)→π+π-(1S) has been made from 128 000 (2S) decays observed in the CLEO detector at the Cornell Electron Storage Ring (CESR). We find this branching ratio to be (19.1±1.2±0.6)%. The properties of the ππ system have been studied using 491 exclusive events of the type (2S)→π+π-(1S), (1S)→e+e-orμ+μ-. Assuming e-μ universality we find B((1S)→μ+μ-)=(2.84±0.18±0.20)%. A search for (2S)→η(1S) yields an upper limit of 1% at the 90% confidence level for this branching ratio. We have also searched for [(2S)or(3S)]→π+π-(1S) , (1S)→noninteracting particles.

Original languageEnglish (US)
Pages (from-to)1433-1439
Number of pages7
JournalPhysical Review D
Volume30
Issue number7
DOIs
StatePublished - 1984

Bibliographical note

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Copyright 2015 Elsevier B.V., All rights reserved.

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