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 View the MathML source. 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.

Properties of hadronic events in e+e− annihilation at / D. Decamp, B. Deschizeaux, J.-P. Lees, M.-N. Minard, J.M. Crespo, M. Delfino, E. Fernandez, M. Martinez, R. Miquel, M.L. Mir, S. Orteu, A. Pacheco, J.A. Perlas, E. Tubau, M.G. Catanesi, M. De Palma, A. Farilla, G. Iaselli, G. Maggi, A. Mastrogiacomo, et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - ELETTRONICO. - 234:(1990), pp. 209-218. [10.1016/0370-2693(90)92030-M]

Properties of hadronic events in e+e− annihilation at

FOCARDI, ETTORE;
1990

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 View the MathML source. 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
234
209
218
D. Decamp;B. Deschizeaux;J.-P. Lees;M.-N. Minard;J.M. Crespo;M. Delfino;E. Fernandez;M. Martinez;R. Miquel;M.L. Mir;S. Orteu;A. Pacheco;J....espandi
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/627201
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