Threshold resummation $S$-factor in QCD: the case of unequal masses

Abstract

The new relativistic Coulomb-like threshold resummation $S$-factor in quantum chromodynamics is obtained. The consideration is given within the framework of quasipotential approach in quantum field theory which is formulated in relativistic configuration representation for two particles of unequal masses.

Comments: 16 pages, Latex, 5 Postscript figures