Abstract
We determine the general coupling of a system of scalars and antisymmetric tensors, with at most two derivatives and undeformed gauge transformations, for both rigid and local N = 2 supersymmetry in four-dimensional spacetime. Our results cover interactions of hyper, tensor and double-tensor multiplets and apply among others to Calabi-Yau threefold compactifications of type II supergravities. As an example, we give the complete lagrangian and supersymmetry transformation rules of the double-tensor multiplet dual to the universal hypermultiplet.
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