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Neutralino dark matter, b − τ Yukawa unification, and nonuniversal sfermion masses

2003; American Physical Society; Volume: 68; Issue: 1 Linguagem: Inglês

10.1103/physrevd.68.015006

1538-4500

Stefano Profumo,

Quantum Chromodynamics and Particle Interactions

We study the implications of minimal nonuniversal boundary conditions in the sfermion soft supersymmetry breaking (SSB) masses of minimal supergravity. We impose asymptotic $b\ensuremath{-}\ensuremath{\tau}$ Yukawa coupling unification and we resort to a parametrization of the deviation from universality in the SSB motivated by the multiplet structure of the $\mathrm{SU}(5)$ grand unified theory. A set of cosmophenomenological constraints, including the recent results from the Wilkinson Microwave Anisotropy Probe, determines the allowed parameter space of the models under consideration. We highlight a ``new coannihilation corridor'' where $\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{\ensuremath{\chi}}\ensuremath{-}{b}_{1}$ and $\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{\ensuremath{\chi}}\ensuremath{-}{\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{\ensuremath{\tau}}}_{1}\ensuremath{-}{\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{\ensuremath{\nu}}}_{\ensuremath{\tau}}$ coannihilations significantly contribute to the reduction of the neutralino relic density.