Summation of threshold singularities in quantum chromodynamics

Abstract

The new relativistic Coulomb-like threshold resummation S- and L-factors in quantum chromodynamics are received. Consideration is conducted within the framework of quasipotential approach in quantum field theory formulated in the rel ativistic configurational representation in the case of two particles of unequal masses. We also suggest a new model expression for R(s) in which threshold singularities are summarized into a main potential contribution.