Abstract
The specific features of massless and massive vector supermultiplets are studied in the context of the N=2 SUSY theories. In the framework of the harmonic superspace formalism, the component form of the superstrength and free lagrangian of the vector multiplet is found without fixing a concrete supergauge. We trace the mechanism of exciting additional degrees of freedom in a massive vector multiplet. By excluding unphysical fields from the resultant component lagrangian, we demonstrate that it coincides with the well known on-shell lagrangian of the N=2 SUSY massive vector multiplet. In conclusion, we discuss the opportunities of further research on the component structure of N=2 SUSY massive non-abelian gauge theory.
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