Study of quark fragmentation in ð‘’+ð‘’âˆ’ annihilation at 29 GeV: Charged-particle multiplicity and single-particle rapidity distributions

M Derrick; K K Gan; P Kooijman; J S Loos; B Musgrave; L E Price; J Repond; J Schlereth; K Sugano; J M Weiss; D E Wood; G Baranko; D Blockus; B Brabson; J M Brom; S W Gray; C Jung; H Neal; H Ogren; D R Rust; M Valdatanappi; C Akerlof; G Bonvicini; J Chapman; D Errede; N Harnew; P Kesten; D I Meyer; D Nitz; A A Seidl; R Thun; T Trinko; M Willutzky; S Abachi; P Baringer; U Mallik; BELTRAMI Beltrami; B G Bylsma; R Debonte; F Loeffler; E H Low; R L Mcilwain; D H Miller; C R NG; L K Rangan; E I Shibata; B Cork

doi:10.1103/PhysRevD.34.3304

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Study of quark fragmentation in ð‘’+ð‘’âˆ’ annihilation at 29 GeV: Charged-particle multiplicity and single-particle rapidity distributions

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Study of quark fragmentation in ð‘’+ð‘’âˆ’ annihilation at 29 GeV: Charged-particle multiplicity and single-particle rapidity distributions

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

Physical review. D, Particles and fields, Vol.34(11), pp.3304-3320

12/01/1986

DOI: 10.1103/PhysRevD.34.3304

PMID: 9957066

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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.

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Title: Subtitle: Study of quark fragmentation in ð‘’+ð‘’âˆ’ annihilation at 29 GeV: Charged-particle multiplicity and single-particle rapidity distributions
Creators: M Derrick - Argonne National Laboratory
K K Gan - Argonne National Laboratory
P Kooijman - Argonne National Laboratory
J S Loos - Argonne National Laboratory
B Musgrave - Argonne National Laboratory
L E Price - Argonne National Laboratory
J Repond - Argonne National Laboratory
J Schlereth - Argonne National Laboratory
K Sugano - Argonne National Laboratory
J M Weiss - Argonne National Laboratory
D E Wood - Argonne National Laboratory
G Baranko - Argonne National Laboratory
D Blockus - Argonne National Laboratory
B Brabson - Argonne National Laboratory
J M Brom - Argonne National Laboratory
S W Gray - Argonne National Laboratory
C Jung - Argonne National Laboratory
H Neal - Argonne National Laboratory
H Ogren - Argonne National Laboratory
D R Rust - Argonne National Laboratory
M Valdatanappi
C Akerlof - Argonne National Laboratory
G Bonvicini - Argonne National Laboratory
J Chapman - Argonne National Laboratory
D Errede - Argonne National Laboratory
N Harnew - Argonne National Laboratory
P Kesten - Argonne National Laboratory
D I Meyer - Argonne National Laboratory
D Nitz - Argonne National Laboratory
A A Seidl - Argonne National Laboratory
R Thun - Argonne National Laboratory
T Trinko - Argonne National Laboratory
M Willutzky - Argonne National Laboratory
S Abachi - Argonne National Laboratory
P Baringer - Argonne National Laboratory
U Mallik - Argonne National Laboratory
BELTRAMI Beltrami
B G Bylsma - Argonne National Laboratory
R Debonte - Argonne National Laboratory
F Loeffler - Argonne National Laboratory
E H Low - Argonne National Laboratory
R L Mcilwain - Argonne National Laboratory
D H Miller - Argonne National Laboratory
C R NG - Argonne National Laboratory
L K Rangan - Argonne National Laboratory
E I Shibata - Argonne National Laboratory
B Cork - Argonne National Laboratory
Resource Type: Journal article
Publication Details: Physical review. D, Particles and fields, Vol.34(11), pp.3304-3320
DOI: 10.1103/PhysRevD.34.3304
PMID: 9957066
NLM abbreviation: Phys Rev D Part Fields
ISSN: 0556-2821
eISSN: 1089-4918
Publisher: American Physical Society
Number of pages: 17
Language: English
Date published: 12/01/1986
Academic Unit: Physics and Astronomy
Record Identifier: 9984627239702771

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