Abstract
A summary of the measurements of the QCD colour factors at LEP is presented. Such measurements provide a test of the gauge group structure underlying the theory of strong interactions. A variety of methods have been applied by the various experiments, and perfect consistency with the expectation of QCD with SU(3) as gauge group is found. By translating a colour factor measurement into a determination of the number of active flavours, ALEPH exludes a light gluino for masses below 6.3 GeV/ c 2.
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