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Tau Decays and $α_s$

The evolution of the determination of the strong coupling constant $α_s$ from the leptonic branching ratios, the lifetime, and the invariant mass distributions of the hadronic final state of the $τ$ 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 $α_s$ determinations. Together with the other determination at the $Z$ boson mass pole, they constitutes the most accurate test of the asymptotic freedom in QCD.

preprint2015arXivOpen access
Zhiqing Zhang
hep-exhep-ph
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Zhiqing Zhang

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