Eur Phys J C (2004) 33: s413-s415
https://doi.org/10.1140/epjcd/s2004-03-1833-x

PS04 Hard QCD

Studies of QCD at LEPII

II. Physikalisches Institut, JLU Giessen, Heinrich-Buff Ring 16, D-39392 Giessen,  

Received: 22 September 2003
Accepted: 29 September 2003
Published online: 9 April 2004

Abstract

A combination of measurements of α _s in e ⁺ e ^– annihilation at LEP is presented. Distributions of various event-shape variables measured by ALEPH, DELPHI, L3 and OPAL at centre-of-mass energies from 41 GeV to 206 GeV are analysed in a common theoretical framework using (α _s ²)+NLLA predictions. The dominant theoretical uncertainties associated to missing higher orders are studied in detail.