1304.1193 (D. M. Ghilencea)
D. M. Ghilencea
We review recent results that provide a new approach to the old problem of naturalness in supersymmetric models, without relying on subjective definitions for the fine-tuning associated with {\it fixing} the EW scale (to its measured value) in the presence of quantum corrections. The approach can address in a model-independent way many questions related to this problem. The results show that naturalness and its measure (fine-tuning) are an intrinsic part of the likelihood to fit the data {\it including} the EW scale. One consequence is that the additional {\it constraint} of fixing the EW scale, usually not imposed in the data fits of the models, impacts on their overall likelihood to fit the data (or chi^2/ndf, ndf: number of degrees of freedom). This can have negative implications for the viability of popular supersymmetric extensions of the Standard Model.
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http://arxiv.org/abs/1304.1193
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