18-24 June 2017
Palacio de Congresos
Europe/Madrid timezone
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Contribution Plenary

Palacio de Congresos - Auditorio Manuel de Falla

Determination of the Strong Coupling Constant by the ALPHA Collaboration

Speakers

  • Dr. Tomasz KORZEC

Primary authors

Content

We present a determination of the strong coupling constant in the MS-bar scheme at the Z-mass scale, using low energy quantities, namely pion/kaon decay constants and masses, as experimental input. The computation employs two different massless finite volume renormalization schemes to non-perturbatively trace the scale dependence of the respective running couplings from a scale of about 200 MeV to 100 GeV. At the largest energies perturbation theory is reliable. At high energies the Schroedinger-Functional scheme is used, while the running at low and intermediate energies is computed in a novel renormalization scheme based on an improved gradient flow. Large volume Nf=2+1 QCD simulations by CLS are used to set the overall scale. We compare to world averages by FLAG and the PDG.