We discuss the perturbative running of αs in a model independent way. Our analysis contains data on the hadronic τ decay and hadronic cross sections in e+ e- annihilation between 5 GeV and Mz We determine the color coefficients and the perturbative β function of the strong interaction. The results are in agreement with QCD and rule out the QCD + light gluino scenarios on the 70.8%-93.0% C.L. We combine our method with that of the multijet analysis at LEP. The combined result rules out light gluinos on the 99.76% C.L., provided that nonperturbative effects are not large.
ASJC Scopus subject areas
- Physics and Astronomy(all)