Determination of the strong coupling constant at LEP
T. Wengler
TL;DR
This paper reviews how measurements of event shape variables and jet rates in electron-positron collisions at LEP are used to determine the strong coupling constant alpha_s, testing QCD predictions across energy scales.
Contribution
It provides a comprehensive review of alpha_s determinations at LEP, emphasizing the use of event shape variables and jet rates in multi-jet events.
Findings
Alpha_s values are consistent with QCD predictions.
Energy dependence of alpha_s confirms asymptotic freedom.
Precise measurements support the validity of QCD at LEP energies.
Abstract
Multi-hadronic events produced in e+e- collisions provide an excellent laboratory to study QCD, the theory of strong interactions, and in particular to determine the strong coupling parameter alpha_s and demonstrate its predicted behavior as a function of the energy scale. Determinations of alpha_s at LEP will be reviewed with emphasis on event shape variables and jet rates in 3-jet and 4-jet events.
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