QCD Tests at $e^+e^-$ Colliders
Siegfried Bethke (RWTH Aachen)

TL;DR
This paper reviews the history of Quantum Chromodynamics (QCD) tests at electron-positron colliders and updates the global measurements of the strong coupling constant, ppa_s.
Contribution
It provides a comprehensive review of past QCD tests at $e^+e^-$ colliders and updates the world summary of ppa_s measurements.
Findings
Updated world measurements of ppa_s
Historical overview of QCD tests at $e^+e^-$ colliders
Summary of experimental progress in QCD validation
Abstract
A short review of the history and a 'slide-show' of QCD tests in annihilation is given. The world summary of measurements of is updated.
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