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.
We explore the Higgs and sparticle spectroscopy of supersymmetric SU (4) c × SU (2) L × SU (2) R models in which the three MSSM gauge couplings and third family (t-b-τ ) Yukawa couplings are all unified at M GUT . This class of models can be obtained via compactification of a higher dimensional theory. Allowing for opposite sign gaugino masses and varying m t within 1σ of its current central value yields a variety of gauge-Yukawa unification as well as WMAP compatible neutralino dark matter solutions. They include mixed bino-Higgsino dark matter, stau and gluino coannihilation scenarios, and the A-resonance solution.
We present a class of supersymmetric models in which symmetry considerations alone dictate the form of the soft SUSY breaking Lagrangian. We develop a class of minimal models, denoted as sMSSM -for flavor symmetry-based minimal supersymmetric standard model, which respect a grand unified symmetry such as SO(10) and a non-Abelian flavor symmetry H which suppresses SUSY-induced flavor violation. Explicit examples are constructed with the flavor symmetry being gauged SU (2) H and SO(3) H with the three families transforming as 2 + 1 and 3 representations respectively. A simple solution is found in the case of SU (2) H for suppressing the flavor violating D-terms based on an exchange symmetry. Explicit models based on SO(3) H without the D-term problem are developed. In addition, models based on discrete non-Abelian flavor groups are presented which are automatically free from D-term issues. The permutation group S 3 with a 2 + 1 family assignment, as well as the tetrahedral group A 4 with a 3 assignment are studied. In all cases, a simple solution to the SUSY CP problem is found, based on spontaneous CP violation leading to a complex quark mixing matrix. We develop the phenomenology of the resulting sMSSM, which is controlled by seven soft SUSY breaking parameters for both the 2 + 1 assignment and the 3 assignment of fermion families. These models are special cases of the phenomenological MSSM (pMSSM), but with symmetry restrictions. We discuss the parameter space of sMSSM compatible with LHC searches, B physics constraints and dark matter relic abundance. Fine-tuning in these models is relatively mild, since all SUSY particles can have masses below about 3 TeV. *
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