Cold Dark Matter and b --> s gamma in the Horava-Witten Theory
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, b-tau and especially t-b Yukawa unification are not so favored since they, generally, require almost degenerate lightest and next-to-lightest sparticle masses. The no Yukawa unification case is the most natural one since it can avoid this degeneracy. The lightest sparticle mass can be as low as about 70 GeV in this case.Keywords
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