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Naturalness and fine tuning in the NMSSM: Implications of Early LHC Results ![]() Auteur(s): Ellwanger Ulrich, Hugonie C., Espitalier-Noel G. (Document sans référence bibliographique) 2011-07-12 Ref Arxiv: 0 Résumé: We study the fine tuning in the parameter space of the semi-constrained NMSSM, where most soft Susy breaking parameters are universal at the GUT scale. We discuss the dependence of the fine tuning on the soft Susy breaking parameters $M_{1/2}$ and $m_0$, and on the Higgs masses in NMSSM specific scenarios involving large singlet-doublet Higgs mixing or dominant Higgs-to-Higgs decays. Whereas these latter scenarios allow a priori for considerably less fine tuning than the constrained MSSM, the early LHC results rule out a large part of the parameter space of the semi-constrained NMSSM corresponding to low values of the fine tuning. |