Zero-curvature representation and dual formulations of N = 2 supersymmetric gauge theory in harmonic superspace

Analytical harmonic superfields are the basic variables of a standard harmonic formalism of SY M-4(2)-theory. We consider superfield actions for alternative formulations of this theory using the unconstrained harmonic prepotentials. The corresponding equations of motion are equivalent to the component field equations of SY M-4(2)-theory. The analyticity condition appears only on shell as the zero-curvature equation in the alternative formulations.