Search

We demonstrate that natural supersymmetry is readily realized in the framework of SU(4)c × SU(2)L × SU(2)R with nonuniversal gaugino masses. Focusing on ameliorating the little hierarchy problem, we explore the parameter space of this model which yields small fine-tuning measuring parameters (natural supersymmetry) at the electroweak scale (ΔEW) as well as at high scale (ΔHS). It is possible to have both ΔEW and ΔHS less than 100 in these models, (2% or better fine-tuning), while keeping the light CP-even (Standard Model-like) Higgs mass in the 123-127 GeV range. The light stop quark mass lies in the range 700 GeV < mt1< 1500 GeV , and the range for the light stau lepton mass is GeV < mτ1 < 1300 GeV. The first two family squarks are in the mass range 3000 GeV < mt1 < 4500 GeV , and for the gluino we find 2500 GeV < mg1 < 3500 GeV . We do not find any solution with natural supersymmetry which yields significant enhancement for Higgs production and decay in the diphoton channel. [ABSTRACT FROM AUTHOR]

We investigate neutralino dark matter in supersymmetric flipped SU(5), focusing on candidates with masses of order 30-150 GeV and spin-independent cross-sections that are consistent with the most recent CDMS II results. We assume gravity mediated supersymmetry breaking and restrict the magnitude of the soft supersymmetry breaking mass parameters to 1 TeV or less. With non-universal soft gaugino and Higgs masses, and taking flipped SU(5) into account, we identify allowed regions of the parameter space and highlight some benchmark solutions including Higgs and sparticle spectroscopy. [ABSTRACT FROM AUTHOR]