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Inspired by the tachyon-free non-supersymmetric heterotic SO(16)xSO(16)string we consider a special class of non-supersymmetric field theories: Thosethat can be obtained from supersymmetric field theories by supersymmetrybreaking twists. We argue that such theories, like their supersymmetric counterparts, may still possess some fermionic symmetries as left-overs of the supergauge transformations and have special one-loop non-renormalization propertiesdue to holomorphicity. In addition, we extend the supergraph techniques tothese theories to calculate some explicit supersymmetry-breaking corrections.

Twisted superspace: Non-renormalization and fermionic symmetries in certain (heterotic string inspired) non-supersymmetric field theories