Study of Quark Fragmentation in e+ e- Annihilation at 29-GeV: Charged Particle Multiplicity and Single Particle Rapidity Distributions

Derrick, M.; Gan, K.K.; Kooijman, P.; Loos, J.S.; Musgrave, B.; Price, L.E.; Repond, J.; Schlereth, J.; Sugano, K.; Weiss, J.M.

doi:10.1103/PhysRevD.34.3304

Study of Quark Fragmentation in e+ e- Annihilation at 29-GeV: Charged Particle Multiplicity and Single Particle Rapidity Distributions

May 27, 1986

57 pages

Part of Proceedings, 23RD International Conference on High Energy Physics, JULY 16-23, 1986, Berkeley, CA

Published in:

Phys.Rev.D 34 (1986) 3304

Contribution to:

- ICHEP 86

DOI:

10.1103/PhysRevD.34.3304

Report number:

ANL-HEP-PR-86-03,
IUHEE-81,
UM-HE-86-06,
PU-86-560

Experiments:

SLAC-PEP-012

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Abstract: (APS)

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.

ELECTRON POSITRON: ANNIHILATION
ANNIHILATION: ELECTRON POSITRON
ELECTRON POSITRON: COLLIDING BEAMS
COLLIDING BEAMS: ELECTRON POSITRON
JET: ELECTROPRODUCTION
ELECTROPRODUCTION: JET
CHARGED PARTICLE: MULTIPLE PRODUCTION
MULTIPLE PRODUCTION: CHARGED PARTICLE
MULTIPLICITY: SPECTRUM
SPECTRUM: MULTIPLICITY

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