In this second part we continue the overview of the recent lattice determination of αs by the ALPHA collaboration. Starting from the result for ΛMSNf=3/µ0 discussed in the first part [1], we first present a precise non-perturbative determination of the Λ-parameter of Nf = 3 QCD. Using perturbative decoupling to match the Nf = 3 and Nf = 5 theories we then extract a precise value for αs. The final result: αs(mZ) = 0.11852(84), reaches subpercent accuracy.
Dalla Brida, M. (2019). αs from the ALPHA collaboration (part II). In 2019 Alphas Workshop on Precision Measurements of the QCD Coupling Constant, ALPHAS 2019 (pp.1-8). Sissa Medialab Srl [10.22323/1.365.0023].
αs from the ALPHA collaboration (part II)
Dalla Brida, M
2019
Abstract
In this second part we continue the overview of the recent lattice determination of αs by the ALPHA collaboration. Starting from the result for ΛMSNf=3/µ0 discussed in the first part [1], we first present a precise non-perturbative determination of the Λ-parameter of Nf = 3 QCD. Using perturbative decoupling to match the Nf = 3 and Nf = 5 theories we then extract a precise value for αs. The final result: αs(mZ) = 0.11852(84), reaches subpercent accuracy.
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