Using data from e+ e- annihilation into hadrons, taken with the OPAL detector at LEP at the Z0 pole between 1991 and 1995, we performed a simultaneous measurement of the strong coupling αs and the colour factors of the underlying gauge group of the strong interaction, CF and CA. 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 CF and CA and the world average of αs(MZ0).
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Nuclear and High Energy Physics