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Tau Decays and αs

Zhongkai Zhang 1, 2
2 BaBar
LAL - Laboratoire de l'Accélérateur Linéaire
Abstract : The evolution of the determination of the strong coupling constant αs 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 αs determinations. Together with the other determination at the Z boson mass pole, they constitutes the most accurate test of the asymptotic freedom in QCD.
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http://hal.in2p3.fr/in2p3-01064995
Contributor : Sabine Starita <>
Submitted on : Wednesday, September 17, 2014 - 4:03:00 PM
Last modification on : Saturday, October 3, 2020 - 3:54:49 AM

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Zhongkai Zhang. Tau Decays and αs. Tau2014 - 13th International Workshop on Tau Lepton Physics, Sep 2014, Aachen, Germany. pp.130-133, ⟨10.1016/j.nuclphysbps.2015.02.027⟩. ⟨in2p3-01064995⟩

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