Speaker
Description
We consider a method for determining the QCD strong coupling constant
using fits of perturbative predictions for event shape averages to data
collected at the LEP, PETRA, PEP and TRISTAN colliders. To obtain highest
accuracy predictions we use a combination of perturbative ${\cal{O}}(\alpha_{S}^{3})$
calculations and estimations of the ${\cal{O}}(\alpha_{S}^{4})$ perturbative
coefficients from data. We account for non-perturbative effects using modern
Monte Carlo event generators and analytic hadronization models.
The obtained results show that the total precision of the $\alpha_{S}$
determination cannot be improved significantly with the higher order perturbative QCD
corrections alone, but primarily requires a deeper understanding of the non-perturbative effects.
| Preferred track | Jets & QCD at High Scales |
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