Prospects for Higgs coupling measurements in SUSY with radiatively-driven naturalness

Abstract

In the post-LHC8 world-- where a Standard Model-like Higgs boson has been established but there is no sign of supersymmetry (SUSY)-- the detailed profiling of the Higgs boson properties has emerged as an important road towards discovery of new physics. We present calculations of the expected deviations in Higgs boson couplings ${\kappa }_{\tau ,b}$, ${\kappa }_t$, ${\kappa }_{W,Z}$, ${\kappa }_g$ and ${\kappa }_{\gamma }$ versus the naturalness measure ${\Delta }_{\mathrm{EW}}$. Low values of ${\Delta }_{\mathrm{EW}}\sim 10-30$ give rise to a natural Little Hierarchy characterized by light higgsinos with a mass of $\mu \sim m_Z$ while top squarks are highly mixed but lie in the several TeV range. For such models with radiatively-driven naturalness, one expects the Higgs boson $h$ to look very SM-like although deviations can occur. The more promising road to SUSY discovery requires direct higgsino pair production at a high energy $e^{+}{e}^{-}$ collider operating with the center-of-mass energy $\sqrt{s}>2\mu \sim \sqrt{2{\Delta }_{\mathrm{EW}}}{m}_Z$.

25 pages and 10 figures

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