TL;DR
This paper reviews the progress in determining the strong coupling constant alpha_s from tau lepton decays, highlighting recent improvements and its significance in testing QCD's asymptotic freedom.
Contribution
It provides a comprehensive review of two decades of alpha_s measurements from tau decays, emphasizing the latest ALEPH results and their role in precision QCD tests.
Findings
Latest ALEPH update yields one of the most precise alpha_s values.
Tau decay measurements complement Z boson data for QCD validation.
Results strongly support asymptotic freedom in QCD.
Abstract
The evolution of the determination of the strong coupling constant from the leptonic branching ratios, the lifetime, and the invariant mass distributions of the hadronic final state of the lepton over the last two decades is briefly reviewed. The improvements in the latest ALEPH update are described in some detail. Currently this is one of the most precise determinations. Together with the other determination at the boson mass pole, they constitutes the most accurate test of the asymptotic freedom in QCD.
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Taxonomy
TopicsParticle physics theoretical and experimental studies · Quantum Chromodynamics and Particle Interactions · High-Energy Particle Collisions Research