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 s=91.0-91.3GeV. 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.

D., D., B., D., J. P., L., M. N., M., J. M., C., M., D., et al. (1990). Properties of Hadronic Events In e+e- Annihilation At Square-root-s=91 Gev. PHYSICS LETTERS. SECTION B, 234(1-2), 209-218 [10.1016/0370-2693(90)92030-M].

Properties of Hadronic Events In e+e- Annihilation At Square-root-s=91 Gev

CIOCCI, MARIA AGNESE;BOTTIGLI, UBALDO;MARROCCHESI, PIER SIMONE;
1990-01-01

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 s=91.0-91.3GeV. 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.
1990
D., D., B., D., J. P., L., M. N., M., J. M., C., M., D., et al. (1990). Properties of Hadronic Events In e+e- Annihilation At Square-root-s=91 Gev. PHYSICS LETTERS. SECTION B, 234(1-2), 209-218 [10.1016/0370-2693(90)92030-M].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/38873
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