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Physics Letters B
We have studied the energy-energy angular corrélations in hadronic final states from Z° decay using the DELPHI detector at LEP. From a comparison with Monte Carlo calculations based on the exact second order QCD matrix élément and string fragmentation we fmd that /l5^= 104îio (stat.)Î2o(syst. )îoo(theor. ) MeV, which corresponds to as(91 GeV) = 0.106± 0.003(stat.) ±0.003(syst.)îo;ooo(theor.). The theoretical error stems from différent choices for the renormalization scale of a,. In the Montedoi:10.1016/0370-2693(90)91097-u fatcat:w4545vmqvjende3ygpsyy2c6na