PoS - Proceedings of Science
Volume 365 - alphas-2019: Workshop on precision measurements of the QCD coupling constant (ALPHAS2019) - $a_S$: Lattice OCD
$a_S$ from the ALPHA collaboration (part II)
M. Dalla Brida
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Pre-published on: July 22, 2019
Published on: September 13, 2019
In this second part we continue the overview of the recent lattice determination of αs by the ALPHA collaboration. Starting from the result for ΛNf=3MS/μ0 discussed in the first part [1], we first present a precise non-perturbative determination of the Λ-parameter ofNf=3 QCD. Using perturbative decoupling to match theNf=3 andNf=5 theories we then extract a precise value for αs. The final result:αs(mZ) =0.11852(84), reaches subpercent accuracy.
DOI: https://doi.org/10.22323/1.365.0023
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