Peculiar features of the relations between pole and running heavy quark masses and estimates of the O(α_s~4) contributions

摘要

Perturbative relations between pole and running heavy quark masses, defined in the Minkowski regions, are considered. Special attention is paid to the appearance of the kinematic π~2-effects, which exist in the coefficients of these series. The estimates of order O(α_s~4) QCD corrections are presented.