The determination of α_s by the ALPHA collaboration

2016/11/17 by Mattia Bruno, Bruno, Mattia, Mattia Dalla Brida +15
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Lattice (hep-lat) #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · doi:10.48550/arxiv.1611.05750

openalex publication_date 2016/11/17 · openalex created_date 2024/04/10 · openalex updated_date 2026/07/28

Abstract

We review the ALPHA collaboration strategy for obtaining the QCD coupling at high scale. In the three-flavor effective theory it avoids the use of perturbation theory at α> 0.2 and at the same time has the physical scales small compared to the cutoff 1/a in all stages of the computation. The result Λ_MS⁽³⁾=332(14)~MeV is translated to α_MS(m_Z)=0.1179(10)(2) by use of (high order) perturbative relations between the effective theory couplings at the charm and beauty quark "thresholds". The error of this perturbative step is discussed and estimated as 0.0002.

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