Inclusive hadron production in upsilon decays and in nonresonant electron-positron annihilation at 10.49 GeV

S. Behrends, K. Chadwick, T. Gentile, Jan M. Guida, Joan A. Guida, A. C. Melissinos, S. L. Olsen, G. Parkhurst, R. Poling, C. Rosenfeld, E. H. Thorndike, P. Tipton, D. Besson, J. Green, R. Namjoshi, F. Sannes, P. Skubic, A. Snyder, R. Stone, A. ChenM. Goldberg, N. Horwitz, A. Jawahery, P. Lipari, G. C. Moneti, C. G. Trahern, H. Van Hecke, S. E. Csorna, L. Garren, M. D. Mestayer, R. S. Panvini, Xia Yi, M. S. Alam, 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, D. Peterson, K. Read, A. Silverman, P. C. Stein, S. Stone, Xu Kezun, A. J. Sadoff, R. T. Giles, J. Hassard, M. Hempstead, K. Kinoshita, W. W. MacKay, F. M. Pipkin, Richard Wilson, P. Haas, T. Jensen, H. Kagan, R. Kass

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93 Scopus citations


We report measurements of single-particle inclusive spectra and two-particle correlations in decays of the Υ(1S) resonance and in nonresonant annihilations of electrons and positrons at center-of-mass energy 10.49 GeV, just below BB̄ threshold. These data were obtained using the CLEO detector at the Cornell Electron Storage Ring (CESR) and provide information on the production of π, K, ρ, K*, φ, p, Λ, and Ξ in quark and gluon jets. The average multiplicity of hadrons per event for upsilon decays (compared with continuum annihilations) is 11.4 (10.5) pions, 2.4 (2.2) kaons, 0.6 (0.5) ρ0, 1.2 (0.8) K*, 0.6 (0.4) protons and antiprotons, 0.15 (0.08) φ, 0.19 (0.07) Λ and Λ̄, and 0.016 (0.005) Ξ- and Ξ̄ +. We have also seen evidence for η and f0 production. The most significant differences between upsilon and continuum final states are (1) the inclusive energy spectra fall off more rapidly with increasing particle energy in upsilon decays, (2) the production of heavier particles, especially baryons, is not as strongly suppressed in upsilon decays, and (3) baryon and antibaryon are more likely to be correlated at long range in upsilon decay than in continuum events.

Original languageEnglish (US)
Pages (from-to)2161-2191
Number of pages31
JournalPhysical Review D
Issue number9
StatePublished - 1985
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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