One-loop effective action in the N=2 supersymmetric massive yang-mills field theory

We consider the script N = 2 supersymmetric massive Yang-Mills field theory formulated in the script N = 2 harmonic superspace. We present various gauge-invariant forms of writing the mass term in the action (in particular, using the Stueckelberg superfield), which result in dual formulations of the theory. We develop a gaugeinvariant and explicitly supersymmetric scheme of the loop expansion of the superfield effective action beyond the mass shell. In the framework of this scheme, we calculate gauge-invariant and explicitly script N = 2 supersymmetric one-loop counterterms including new counterterms depending on the Stueckelberg superfield. We analyze the component structure of one of these counterterms. © 2008 MAIK/Nauka.