Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-11-07
Mod.Phys.Lett. A16 (2001) 2517-2528
Physics
High Energy Physics
High Energy Physics - Phenomenology
LaTeX 2.09, 12 pages with 5 EPS figures, uses mpla1.sty; enlarged version is accepted for publication in Mod. Phys. Lett. A
Scientific paper
10.1142/S0217732301005989
The properties of the new analytic running coupling are investigated at the higher loop levels. The expression for this invariant charge, independent of the normalization point, is obtained by invoking the asymptotic freedom condition. It is shown that at any loop level the relevant $\beta$ function has the universal behaviors at small and large values of the invariant charge. Due to this feature the new analytic running coupling possesses the universal asymptotics both in the ultraviolet and infrared regions irrespective of the loop level. The consistency of the model considered with the general definition of the QCD invariant charge is shown.
Nesterenko A. V.
Solovtsov Igor L.
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