Inclusive hadron production in upsilon decays and in nonresonant electron-positron annihilation at 10. 49 GeV

Journal Article · Wed May 01 04:00:00 EDT 1985 · Phys. Rev. D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.31.2161· OSTI ID:5748238

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

We report measurements of single-particle inclusive spectra and two-particle correlations in decays of the UPSILON(1S) resonance and in nonresonant annihilations of electrons and positrons at center-of-mass energy 10.49 GeV, just below BB-bar threshold. These data were obtained using the CLEO detector at the Cornell Electron Storage Ring (CESR) and provide information on the production of ..pi.., K, rho, K(, phi, p, ..lambda.., and ..xi.. 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) rho/sup 0/, 1.2 (0.8) K(, 0.6 (0.4) protons and antiprotons, 0.15 (0.08) phi, 0.19 (0.07) ..lambda.. and Lambda-bar, and 0.016 (0.005) ..xi../sup -/ and Xi-bar /sup +/. We have also seen evidence for eta and f/sup 0/ 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.

• Research Organization: University of Rochester, Rochester, New York 14627
• OSTI ID: 5748238
• Journal Information: Phys. Rev. D; (United States), Journal Name: Phys. Rev. D; (United States) Vol. 31:9; ISSN PRVDA
• Country of Publication: United States
• Language: English

Related Subjects

645102* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Weak Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
BASIC INTERACTIONS
BOSONS
BREMSSTRAHLUNG
CESR STORAGE RING
DECAY
ELECTROMAGNETIC INTERACTIONS
ELECTROMAGNETIC RADIATION
ELECTRON-POSITRON INTERACTIONS
ELEMENTARY PARTICLES
ENERGY SPECTRA
GLUONS
HADRONS
INCLUSIVE INTERACTIONS
INTERACTIONS
JET MODEL
LEPTON-LEPTON INTERACTIONS
LINEAR MOMENTUM
MATHEMATICAL MODELS
MESON RESONANCES
MESONS
MULTIPLICITY
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
POSTULATED PARTICLES
QUARKS
RADIATIONS
RESONANCE PARTICLES
SPECTRA
STORAGE RINGS
TRANSVERSE MOMENTUM
UPSILON RESONANCES
UPSILON-9500 RESONANCES