A method for calculating the double logarithmic asymptotic behavior of vertex functions in quantum field theory

A method is proposed for calculating the double logarithmic asymptotic behavior of vertex functions of quantum chromodynamics in perturbation theory. The method is based on systematic use of the connection between the momentum and coordinate representations. The method is illustrated by the example of the calculation of the singlet and nonsinglet quark form factors up to the sixth order of perturbation theory.