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Measurement of the charged particle multiplicity distribution in hadronic Z decays

Decamp, D. and Finch, Alexander (1991) Measurement of the charged particle multiplicity distribution in hadronic Z decays. Physics Letters B, 273 (1-2). pp. 181-192. ISSN 0370-2693

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Abstract

The charged particle multiplicity distribution of hadronic Z decays was measured on the peak of the Z resonance using the ALEPH detector at LEP. Using a model independent unfolding procedure the distribution was found to have a mean 〈n〉=20.85±0.24 and a dispersion D=6.34±0.12. Comparison with lower energy data supports the KNO scaling hypothesis in the energy range GeV. At GeV the shape of the multiplicity distribution is well described by a log-normal distribution, as predicted from a cascading model for multi-particle production. The same model also successfully describes the energy dependence of the mean and width of the multiplicity distribution. A next-to-leading order QCD prediction in the framework of the modified leading-log approximation and local parton-hadron duality is found to fit the energy dependence of the mean but not the width of the charged multiplicity distribution, indicating that the width of the multiplicity distribution is a sensitive probe for higher order QCD or non-perturbative effects.

Item Type: Article
Journal or Publication Title: Physics Letters B
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 63786
Deposited By: ep_importer_pure
Deposited On: 07 May 2013 14:43
Refereed?: Yes
Published?: Published
Last Modified: 21 Nov 2017 18:32
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/63786

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