Mass-deformed N=3 supersymmetric Chern-Simons-matter theory

The maximal extension of supersymmetric Chern-Simons theory coupled to fundamental matter has N=3 supersymmetry. In this short paper, we provide the explicit form of the action for the mass-deformed N=3 supersymmetric U(N) Chern-Simons-matter theory. The theory admits a unique triplet mass-deformation term consistent with supersymmetry. We explicitly construct the mass-deformed N=3 theory in N=1 superspace using a fundamental and an antifundamental superfield.