Worldline approach to Sudakov-type form factors in non-Abelian gauge theories
G. C. Gellas, A. I. Karanikas, C. N. Ktorides, N. G. Stefanis
Abstract
We calculate Sudakov-type form factors for isolated spin-1/2 particles (fermions) entering non-Abelian gauge-field systems. We consider both the on- and the off-mass-shell case using a methodology which rests on a worldline casting of field theories. The simplicity and utility of our approach derives from the fact that we are in a position to make, a priori, a more transparent separation (factorization), with respect to a given scale, between short- and long-distance physics than diagramatic methods.
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