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Cold Dark Matter and b --> s gamma in the Horava-Witten Theory | | S. Khalil
; G. Lazarides
; C. Pallis
; | | Date: |
3 May 2000 | | Journal: | Phys.Lett. B508 (2001) 327-334 | | Subject: | hep-ph | | Affiliation: | Autonoma U. de Madrid & Ain Shams U., Cairo), G. Lazarides, C. Pallis (Aristotle U. of Thessaloniki | | 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. | | Source: | arXiv, hep-ph/0005021 | | Services: | Forum | Review | PDF | Favorites | |
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