Study of quark fragmentation in e+e- annihilation at 29 GeV: Charged-particle multiplicity and single-particle rapidity distributions.

Derrick, M; Gan, K; Kooijman, P; Loos, J; Musgrave, B; Price, L; Repond, J; Schlereth, J; Sugano, K; Weiss, J; Wood, D; Baranko, G; Blockus, D; Brabson, B; Brom, J; Gray, S; Jung, C; Neal, H; Ogren, H; Rust, DR; Valdata-Nappi, M; Akerlof, C; Bonvicini, G; Chapman, J; Errede, D

Journal article

Study of quark fragmentation in e+e- annihilation at 29 GeV: Charged-particle multiplicity and single-particle rapidity distributions.

Abstract:: This paper presents the charged-particle multiplicity distributions for e+e- annihilation at s =29 GeV measured in the High Resolution Spectrometer. The data, which correspond to an integrated luminosity of 185 pb-1, were obtained at the SLAC e+e- storage ring PEP. The techniques used to correct the observed prong numbers are discussed. The multiplicity distribution of the charged particles has a mean value n=12.87±0.03±0.30, a dispersion D2=3.67±0.02±0.18, and an f2 moment of 0.60±0.02±0. 18. Results are also presented for a two-jet sample selected with low sphericity and aplanarity. The charged-particle distributions are almost Poissonian and narrower than have been reported by other e+e- experiments in this energy range. The mean multiplicity increases with the event sphericity, and for the sample of threefold-symmetric three-jet events, a value of n=16.3±0.3±0.7 is found. No correlation is observed between the multiplicities in the two hemispheres when the events are divided into two jets by a plane perpendicular to the thrust axis. This result is in contrast with the situation in soft hadronic collisions, where a strong forward-backward correlation is measured. For the single jets, a mean multiplicity of 6.43±0.02±0.15 and a dispersion value of D2=2.55±0.02±0.13 are found. These values give further support to the idea of independent jet fragmentation. The multiplicity distributions are well fit by the negative-binomial distribution. The semi-inclusive rapidity distributions are presented. Comparisons are made to the measurements of charged-particle multiplicities in hadron-hadron and lepton-nucleon collisions. © 1986 The American Physical Society.

Publication status:: Published

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APA Style

Derrick, M., Gan, K., Kooijman, P., Loos, J., Musgrave, B., Price, L., Repond, J., Schlereth, J., Sugano, K., Weiss, J., Wood, D., Baranko, G., Blockus, D., Brabson, B., Brom, J., Gray, S., Jung, C., Neal, H., Ogren, H., … Errede, D. (1986). Study of quark fragmentation in e+e- annihilation at 29 GeV: Charged-particle multiplicity and single-particle rapidity distributions. Physical Review. D, Particles and Fields, 34(11), 3304–3320.

MLA Style

Derrick, M., et al. “Study of Quark Fragmentation in e+e- Annihilation at 29 GeV: Charged-Particle Multiplicity and Single-Particle Rapidity Distributions.” Physical Review. D, Particles and Fields, vol. 34, no. 11, 1986, pp. 3304–20.

Chicago Style

Derrick, M, K Gan, P Kooijman, J Loos, B Musgrave, L Price, J Repond, et al. 1986. “Study of Quark Fragmentation in e+e- Annihilation at 29 GeV: Charged-Particle Multiplicity and Single-Particle Rapidity Distributions.” Physical Review. D, Particles and Fields 34 (11): 3304–20.
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