On a Summation of Threshold Singularities in the Relativistic Quasipotential Approach

Abstract

The properties of new relativistic Coulomb-like threshold resummation S- and L-factors in quantum chromodynamics are learned. Consideration is conducted withinthe framework of quasipotential approach in quantum eld theory formulated in therelativistic con gurational representation in the case of two particles of arbitrarymasses. We also suggest a new model expression for the principal contribution tothe Drell ratio R (s) for the vector and axial-vector currents with the the new S-and P-factors by means of which threshold singularities are summarized into a mainpotential contribution.