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.
|Titolo:||Properties of hadronic events in e+e- annihilation at sqrt(s)=91 GeV|
|Data di pubblicazione:||1990|
|Digital Object Identifier (DOI):||10.1016/0370-2693(90)92030-M|
|Appare nelle tipologie:||1.1 Articolo in rivista|