High-momentum asymptotics from the Fock–Feynman–Schwinger path integral

The asymptotics of n-point Greenʹs function at large external momenta is obtained in the exponentiated from using the Fock–Feynman–Schwinger representation for propagators in the external field. The method is applied to gauge theories such as QCD and QED, and the Sudakov form-factor is calculated as an example in QED and meson form-factor in QCD. Nonperturbative contributions can be conveniently included, as it is demonstrated in the example of the confinement correction to the form-factor.