# Studies of QCD at $e^{+}e^{-}$ centre-of-mass energies between 91 and 209 GeV

Abstract : The hadronic final states observed with the ALEPH detector at LEP in e+e- annihilation are analysed using 730 pb-1 of data collected between 91 and 209 GeV in the framework of QCD. In particular event-shape variables and inclusive charged particle spectra are measured. The energy evolution of quantities derived from these measurements is compared to analytic QCD predictions. The mean charged particle multiplicity, the charged particle momentum spectrum and its peak position are compared to predictions of the modified-leading-logarithmic approximation. The strong coupling constant alpha_s is determined from a fit of the QCD prediction to distributions of six event-shape variables at eight centre-of-mass energies. A study of non-perturbative power law corrections is presented
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00021818
Contributor : Claudine Bombar <>
Submitted on : Tuesday, July 27, 2004 - 2:27:20 PM
Last modification on : Tuesday, April 20, 2021 - 12:00:07 PM
Long-term archiving on: : Wednesday, March 31, 2010 - 2:24:39 PM

### Identifiers

• HAL Id : in2p3-00021818, version 1

### Citation

A. Heister, S. Schael, R. Barate, R. Bruneliere, I. de Bonis, et al.. Studies of QCD at $e^{+}e^{-}$ centre-of-mass energies between 91 and 209 GeV. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2004, 35, pp.457-486. ⟨in2p3-00021818⟩

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