Properties of hadronic Z decays and test of QCD generators

The ALEPH Collaboration

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Abstract

Distributions are presented of event shape variables, jet roduction rates and charged particle momenta obtained from 53 000 hadronic Z decays. They are compared to the predictions of the QCD+hadronization models JETSET, ARIADNE and HERWIG, and are used to optimize several model parameters. The JETSET and ARIADNE coherent parton shower (PS) models with running αs and string fragmentation yield the best description of the data. The HERWIG parton shower model with cluster fragmentation fits the data less well. The data are in better agreement with JETSET PS than with JETSET O(αS 2) matrix elements (ME) even when the renormalization scale is optimized.

Original languageEnglish
Pages (from-to)209-234
Number of pages26
JournalZeitschrift fuer Physik C. Particles and Fields
Volume55
Issue number2
DOIs
Publication statusPublished - 1 Jan 1992
Externally publishedYes

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