Abstract
We have studied the energy-energy angular correlations in hadronic final states from Z 0 decay using the DELPHI detector at LEP. From a comparison with Monte Carlo calculations based on the exact second order QCD matrix element and string fragmentation we find that Λ (5) MS=104 +25 -20( stat.) +25 -20( syst.) +30 00) theor.) . MeV, which corresponds to α s(91 GeV)=0.106±0.003(stat.)±0.003(syst.) +0.003 -0.000(theor). The theoretical error stems from different choices for the renormalization scale of α s. In the Monte Carlo simulation the scale of α s as well as the fragmentation parameters have been optimized to described reasonably well all aspects of multihadron production.
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