Higgs sector and fine-tuning in the phenomenological MSSM

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Abstract
The recent discovery of a 125 GeV Higgs, as well as the lack of any positive findings in searches for supersymmetry, has renewed interest in both the supersymmetric Higgs sector and fine-tuning (FT). Here, we continue our study of the phenomenological minimal supersymmetric standard model (pMSSM), discussing the light Higgs and FT within the context of two sets of previously generated pMSSM models. We find an abundance of models with experimentally favored Higgs masses and couplings. We investigate the decay modes of the light Higgs in these models, finding strong correlations between many final states. We then examine the degree of FT, considering contributions from each of the pMSSM parameters at up to next-to-leading log order. In particular, we examine the FT implications for our model sets that arise from the discovery of a 125 GeV Higgs. Finally, we investigate a small subset of models with low FT and a light Higgs near 125 GeV, describing the common features of such models. We generically find a light stop and bottom with complex decay patterns into a set of light electroweak gauginos, which will make their discovery more challenging and may require novel search techniques.
Funding Information
  • U.S. Department of Energy

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