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Precise determination of the strong coupling has become one of the most important tasks of the QCD theory and phenomenology [1]. From the theoretical point of view the cleanest measurement comes from the total e + e - annihilation cross section at high energies. The accuracy is dominated in this case by statistical errors; high statistics is needed because the effect proportional to α s is a few percent fraction only of the total cross section. Thus, going over to various event shape observables which are proportional to α s at the leading order presents a clear experimental advantage. The price to pay is that the QCD description becomes more complicated and making a defensible estimate of the theoretical accuracy presents a nontrivial task.

Theoretical Uncertainties in the Determination of α s from Hadronic Event Observables: the Impact of Nonperturbative Effects