Supersoft Stops

In a supersymmetric theory, the IR contributions to the Higgs mass are calculable below the mediation scale ΛUV in terms of the IR field content and parameters. However, logarithmic sensitivity to physics at ΛUV remains. In this Letter, we present a first example of a framework, dictated by symmetries, to supersoften these logarithms from the matter sector. The result is a model with finite, IR-calculable corrections to the Higgs mass. This requires the introduction of new fields—the “lumberjacks”—whose role is to screen the UV-sensitive logs. These models have considerably reduced fine-tuning, by more than an order of magnitude for high-scale supersymmetry. This impacts interpretations of the natural parameter space, suggesting it may be premature to declare a naturalness crisis for high-scale supersymmetry.