Strong-coupling constant with flavor thresholds at five loops in the modified minimal-subtraction scheme.
We present in analytic form the matching conditions for the strong-coupling constant alphas(nf) (mu) at the flavor thresholds to four loops in the modified minimal-subtraction scheme. Taking into account the present knowledge on the coefficient beta4 of the Callan-Symanzik beta function of quantum chromodynamics, we thus derive a five-loop formula for alphas(nf) (mu) together with appropriate relationships between the asymptotic scale parameters Lamda(nf) for different numbers of flavors nf.
Kniehl
B A
BA
II. Institut für Theoretische Physik, Universität Hamburg, 22761 Hamburg, Germany.
Kotikov
A V
AV
Onishchenko
A I
AI
Veretin
O L
OL