Bayesian analysis and naturalness of (Next-to-)Minimal Supersymmetric Models

Peter Athron, Csaba Balazs, Benjamin Farmer, Andrew Fowlie, Dylan Harries, Doyoun Kim

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The Higgs boson discovery stirred interest in next-to-minimal supersymmetric models, due to the apparent fine-tuning required to accommodate it in minimal theories. To assess their naturalness, we compare fine-tuning in a ℤ3 conserving semi-constrained Next-to-Minimal Supersymmetric Standard Model (NMSSM) to the constrained MSSM (CMSSM). We contrast popular fine-tuning measures with naturalness priors, which automatically appear in statistical measures of the plausibility that a given model reproduces the weak scale. Our comparison shows that naturalness priors provide valuable insight into the hierarchy problem and rigorously ground naturalness in Bayesian statistics. For the CMSSM and semi-constrained NMSSM we demonstrate qualitative agreement between naturalness priors and popular fine tuning measures. Thus, we give a clear plausibility argument that favours relatively light superpartners.

Original languageEnglish
Article number160
Number of pages43
JournalJournal of High Energy Physics
Issue number10
Publication statusPublished - 1 Oct 2017


  • Supersymmetry Phenomenology

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