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Dual conformal symmetry and Yangian symmetry are symmetries of amplitudesthat have aided the study of scattering amplitudes in highly supersymmetrictheories like ${\cal N}=4$ SYM and ABJM. However, in general such symmetriesare absent from the theories with lesser or no supersymmetry. In this paper, weshow that the tree level $2\to 2$ scattering amplitude in the 3d ${\cal N}=2$Chern-Simons theory coupled to a fundamental chiral multiplet is dualsuperconformal invariant. In the 't Hooft large $N$ limit, the $2\to 2$scattering amplitude in this theory has been shown to be tree-level exact innon-anyonic channels, while having only an overall multiplicative couplingdependent renormalisation in the anyonic channel. Therefore, the dualsuperconformal symmetry that we demonstrate in this paper is all loop exact.This is unlike the previously studied highly supersymmetric theories where dualsuperconformal symmetry is anomalous at loop levels.  Furthermore, we reverse the argument to study the extent to which dualsuperconformal invariance fixes the scattering amplitude in an ${\cal N}=2$supersymmetric theory. We demonstrate that requiring the dual superconformalinvariance completely fixes the momentum dependence of the $2\to2$ amplitude,while the coupling constant dependence remain unfixed. Further, we use acombination of parity invariance, unitarity and self-duality of the amplitudeto constrain the coupling dependence of scattering amplitude.

Dual Superconformal Symmetry of ${\cal N}=2$ Chern-Simons theory with Fundamental Matter at Large $N$