The running coupling of QCD with four flavors
Fatih Tekin, Rainer Sommer, Ulli Wolff
TL;DR
This paper computes the non-perturbative running coupling of four-flavor QCD using the Schroedinger functional scheme, comparing results with perturbative predictions and two-flavor data to enhance understanding of QCD behavior.
Contribution
It provides the first non-perturbative calculation of the step scaling function and running coupling for four-flavor QCD in the Schroedinger functional scheme, extending previous two-flavor studies.
Findings
Non-perturbative results align with 2-loop and 3-loop perturbation theory at high energies.
The study offers insights into the flavor dependence of QCD running coupling.
Comparison with two-flavor data highlights flavor effects on the coupling evolution.
Abstract
We have calculated the step scaling function and the running coupling of QCD in the Schroedinger functional scheme with four flavors of O(a) improved Wilson quarks. Comparisons of our non-perturbative results with 2-loop and 3-loop perturbation theory as well as with non-perturbative data for only two flavors are made.
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