Abstract
We offer a guide to dimensional reduction in theories with anomaly-mediated supersymmetry breaking. Evanescent operators proportional to $\ensuremath{\epsilon}$ arise in the bare Lagrangian when it is reduced from $d=4$ to $d=4\ensuremath{-}2\ensuremath{\epsilon}$ dimensions. In the course of a detailed diagrammatic calculation, we show that inclusion of these operators is crucial. The evanescent operators conspire to drive the supersymmetry-breaking parameters along anomaly-mediation trajectories across heavy particle thresholds, guaranteeing the ultraviolet insensitivity.
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