In Search of the Next Next-to-MSSM
Abstract
It is argued that the Next-to-MSSM (NMSSM) is unnatural from the point of view of cosmology and fine tuning. In particular, such singlet extensions to the MSSM do not provide a simple solution to the `μ-problem'. Models with singlets can be constructed using gauged-R symmetry or target space duality. However their superpotentials have terms in addition to those of the NMSSM.
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