Abstract
Using data from e + e − annihilation into hadrons, taken with the OPAL detector at LEP at the Z 0 pole between 1991 and 1995, we performed a simultaneous measurement of the strong coupling α s and the colour factors of the underlying gauge group of the strong interaction, C F and C A . The measurement was carried out by fitting next-to-leading order perturbative predictions to measured angular correlations of 4-jet events together with either a multi-jet rate or an event-shape variable. Our combined results provide a test of perturbative QCD with the assumptions only of non-abelian gauge symmetry and standard hadronization models. Our results are in agreement with SU(3) expectations for C F and C A and the world average of α s ( M Z 0 ).
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