Cold Dark Matter and b --> s gamma in the Horava-Witten Theory
arXiv:hep-ph/0005021 · doi:10.1016/S0370-2693(01)00366-5
Abstract
The minimal supersymmetric standard model with complete, partial or no Yukawa unification and radiative electroweak breaking with boundary conditions from the Horava-Witten theory is considered. The parameters are restricted by constraining the lightest sparticle relic abundance by cold dark matter considerations and requiring the b-quark mass after supersymmetric corrections and the branching ratio of b --> s gamma to be compatible with data. Complete Yukawa unification can be excluded. Also, t-b Yukawa unification is strongly disfavored since it requires almost degenerate lightest and next-to-lightest sparticle masses. However, the b-tau or no Yukawa unification cases avoid this degeneracy. The latter with mu<0 is the most natural case. The lightest sparticle mass, in this case, can be as low as about 77 GeV.
16 pages including 4 figures, Revtex, version to appear in Phys. Lett. B
References in corpus (6)
- Calculations of Neutralino-Stau Coannihilation Channels and the Cosmologically Relevant Region of MSSM Parameter Space
- Supersymmetric Cold Dark Matter with Yukawa Unification
- Yukawa Unification, b --> s gamma and Bino-Stau Coannihilation
- Phenomenology of Non-Standard Embedding and Five-branes in M-Theory
- Neutralino Relic Density with a Cosmological Constant confronts Electroweak Precision Measurements
- Electroweak symmetry breaking and s-spectrum in M-theory
Cited by in corpus (15)
- Dark Matter Detection in the Light of Recent Experimental Results
- Yukawa Quasi-Unification
- b-tau Unification with Gaugino and Sfermion Mass non Universality
- On Yukawa quasi-unification with mu<0
- New shifted hybrid inflation
- Semi-shifted hybrid inflation with B-L cosmic strings
- New smooth hybrid inflation
- Standard-smooth hybrid inflation
- CMSSM with Yukawa Quasi-Unification Revisited
- Inflation, Leptogenesis, and Yukawa Quasi-Unification within a Supersymmetric Left-Right Model
- Gravitational Waves from Double Hybrid Inflation
- Constrained Minimal Supersymmetric Standard Model with Generalized Yukawa Quasi-Unification
- Phenomenology of heterotic M-theory with five-branes
- Cold Dark Matter and Higgs Mass in the Constrained Minimal Supersymmetric Standard Model with Generalized Yukawa Quasi-Unification
- Phenomenology and Cosmology of Supersymmetric Grand Unified Theories