Cold Dark Matter and b --> s gamma in the Horava-Witten Theory

Preprint
Publisher Website
Google Scholar
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 and t-b Yukawa unification can be excluded. Also, b-tau Yukawa unification is not so favored since it, generally, requires 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.

This publication has 0 references indexed in Scilit: