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.

Properties of hadronic events in e+e- annihilation at sqrt(s)=91 GeV / Decamp, D., Deschizeaux, B., Lees, J.-P., Minard, M.-N., Crespo, J.M., Delfino, M., Fernandez, E., Martinez, M., Miquel, R., Mir, M.L., Orteu, S., Pacheco, A., Perlas, J.A., Tubau, E., Catanesi, M.G., de Palma, M., Farilla, A., Iaselli, G., Maggi, G., Mastrogiacomo, A., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 234:1-2(1990), pp. 209-218. [10.1016/0370-2693(90)92030-M]

Properties of hadronic events in e+e- annihilation at sqrt(s)=91 GeV

Iaselli, G.;Maggi, G.;
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 . 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
Properties of hadronic events in e+e- annihilation at sqrt(s)=91 GeV / Decamp, D., Deschizeaux, B., Lees, J.-P., Minard, M.-N., Crespo, J.M., Delfino, M., Fernandez, E., Martinez, M., Miquel, R., Mir, M.L., Orteu, S., Pacheco, A., Perlas, J.A., Tubau, E., Catanesi, M.G., de Palma, M., Farilla, A., Iaselli, G., Maggi, G., Mastrogiacomo, A., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 234:1-2(1990), pp. 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/11589/7908
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