Nonuniversal gaugino masses, the supersymmetric little hierarchy problem, and dark matter

2012/01/31 by James E. Younkin, Stephen P. Martin · 50 citations
Physics and Astronomy · #Annihilation #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark matter #Gaugino #Gluino #Hierarchy problem #Higgs boson #Large Hadron Collider #Minimal Supersymmetric Standard Model #Neutralino #Parameter space #Particle physics #Particle physics theoretical and experimental studies #Physics #Physics beyond the Standard Model #Supergravity #Supersymmetry #hep-ph

paper · pdf · doi:10.1103/physrevd.85.055028

published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 85(5) (American Physical Society) · 24 pages. v2: references and minor comments added

arxiv created 2012/03/02 · openalex publication_date 2012/03/30 · arxiv updated 2013/05/29 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We study a class of supersymmetric models with nonuniversal gaugino masses that could arise from F-terms in a general combination of the singlet and adjoint representations of SU(5). We explore models that satisfy present Large Hadron Collider and other bounds, showing how the allowed parameter space is divided into distinct ``continents.'' Regions of parameter space that ameliorate the supersymmetric little hierarchy problem with a small \ensuremathμ parameter include the usual focus-point scenario, but also natural areas with much lighter squarks and sleptons. These models are continuously connected in parameter space to regions in which stau coannihilation or Higgs exchange is mostly responsible for dark matter annihilation, and to models in which the thermal relic abundance is achieved by slepton-mediated annihilation, reviving the bulk region that is severely restricted in minimal supergravity models. In hybrid or confluence regions, several mechanisms combine to give the requisite dark matter annihilation rate. In each case, we study the prospects for direct detection of dark matter. We also comment briefly on the impact of recent hints for M_h near 125 GeV from the LHC.

Citations

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Cited by

• Quasifixed points from scalar sequestering and the little hierarchy problem in supersymmetry
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