Author/Authors :
ALPHA Collaboration، نويسنده , , Fatih Tekin، نويسنده , , Rainer Sommer، نويسنده , , Ulli Wolff، نويسنده ,
Abstract :
We have calculated the step scaling function and the running coupling of QCD in the Schrödinger functional scheme with four flavors of image 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.
