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Properties of hadronic events in e+e− annihilation at $S^(1/2)$ = 91-GeV

Research output: Contribution to journalJournal article

Published

Journal publication date1990
JournalPhysics Letters B
Journal number1-2
Volume234
Number of pages10
Pages209-218
Original languageEnglish

Abstract

We report on properties of hadronic events from e+e− annihilation observed by the ALEPH detector at the large Electron Positron Collider at CERN. The center-of-mass energy was . Measured distributions of the global event-shape variables sphericity, aplanarity, thrust and minor value, and of the inclusive variables xp, p⊥in, p⊥out and y are presented. We measure a mean charged multiplicity in hadronic events of 〈Nch〉=21.3±0.1 (statistical)±0.6 (systematic). The data are in good agreement with QCD-based models which use the leading-logarithm approximation, and are less well described by a model using O(αs2) QCD.