A light neutralino in hybrid models of supersymmetry breaking
arXiv:0808.0562 · doi:10.1016/j.nuclphysb.2008.09.023
Abstract
We show that in gauge mediation models where heavy messenger masses are provided by the adjoint Higgs field of an underlying SU(5) theory, a generalized gauge mediation spectrum arises with the characteristic feature of having a neutralino LSP much lighter than in the standard gauge or gravity mediation schemes. This naturally fits in a hybrid scenario where gravity mediation, while subdominant with respect to gauge mediation, provides mu and Bmu parameters of the appropriate size for electroweak symmetry breaking.
arXiv comment32 pages. v2: revised discussions of the generation of Bmu and of the dark matter constraint; numerous small redactional changes; remarks and references added
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