A comparison of jet production rates on the Z0 resonance to perturbative QCD

The production rates for 2-, 3-, 4- and 5-jet hardronic final states have been measured with the DELPHI detector at the e+e- storage ring LEP at centre of mass energies around 91.5 GeV. Fully corrected data are compared to O(αs2) QCD matrix element calculations and the QCD scale parameter Λsub(anti Manti S) is determined for different parametrizations of the renormalization scale μ2. Including all uncertainties our result is αs(MZ2)=0.114±0.003[stat.]±0.004[syst.]±0.012[theor.]. (orig.)