The strong coupling constant from lattice QCD with N_f=2 dynamical quarks
S. Booth, M. G\"ockeler, R. Horsley, A.C. Irving, B. Joo, S. Pickles,, D. Pleiter, P.E.L. Rakow, G. Schierholz, Z. Sroczynski, H. St\"uben
TL;DR
This paper calculates the strong coupling constant in lattice QCD with two dynamical quarks, using improved perturbation theory to enhance the accuracy of the conversion to the MS scheme.
Contribution
It introduces an improved method employing Padé approximants for higher-order perturbative conversion in lattice QCD calculations.
Findings
Determined $\Lambda_{ar{MS}}$ for N_f=2 with improved precision.
Demonstrated the effectiveness of Padé-improved perturbation theory.
Enhanced the reliability of lattice QCD results for the strong coupling constant.
Abstract
We compute for two flavors of light dynamical quarks using non-perturbatively improved Wilson fermions. We improve on a recent calculation by employing Pad\'e-improved two-loop and three-loop perturbation theory to convert the lattice numbers to the scheme.
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