Studies of QCD at LEPII
arXiv:hep-ex/0309061 · doi:10.1140/epjcd/s2004-03-1833-x
Abstract
A combination of measurements of alpha_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 O(a_s**2)+NLLA predictions. The dominant theoretical uncertainties associated to missing higher orders are studied in detail.
3 pages, 3 figures