PS04 Hard QCD
Studies of QCD at LEPII
II. Physikalisches Institut, JLU Giessen, Heinrich-Buff Ring 16, D-39392 Giessen,
Accepted: 29 September 2003
Published online: 9 April 2004
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.
© Società Italiana di Fisica, Springer-Verlag, 2004