Abstract
We consider the renormalization of the Fayet-Iliopoulos D term in a softly broken Abelian supersymmetric theory, and calculate the associated \ensuremath{\beta} function through three loops. We show that there exists (at least through three loops) a renormalization group invariant trajectory for the coefficient of the D term, corresponding to the conformal anomaly solution for the soft masses and couplings.
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