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.