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Studies of QCD at e+ e- centre-of-mass energies between 91-GeV and 209-GeV

Research output: Contribution to journalJournal article

Published

Journal publication date07/2004
JournalEuropean Physical Journal C: Particles and Fields
Journal number4
Volume35
Number of pages30
Pages457-486
Original languageEnglish

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 αs 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.

Bibliographic note

Jones performed the data analysis of all observables included and worked with one other on the theoretical interpretations. This gives one of the most precise measurements of alpha_s, and so feeds into many physics predictions. RAE_import_type : Journal article RAE_uoa_type : Physics