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

, ALEPH Collaboration (1990) Properties of hadronic events in e+e− annihilation at $S^(1/2)$ = 91-GeV. Physics Letters B, 234 (1-2). pp. 209-218. ISSN 0370-2693

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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.

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Journal Article
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Physics Letters B
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02 May 2013 14:47
Last Modified:
21 Nov 2022 23:38