Combined QCD analysis of e^+ e^- data at sqrt(s) = 14 to 172 GeV

TL;DR

This paper analyzes how event shape observables depend on energy in e^+ e^- collisions and determines the strong coupling constant _s from these measurements, accounting for hadronization effects.

Contribution

It provides a combined QCD analysis of e^+ e^- data across a wide energy range, incorporating power corrections for more accurate _s determination.

Findings

_s was measured at various energies with improved accuracy.

Power corrections effectively model hadronization effects.

Energy dependence of event shape observables is characterized.

Abstract

A study of the energy dependence of event shape observables is presented. The strong coupling constant \alpha_s has been determined from the mean values of six event shape observables. Power corrections, employed for the measurement of \alpha_s, have been found to approximately account for hadronisation effects.