Electroweak Baryogenesis and Dark Matter in the nMSSM

Details Electroweak Baryogenesis and Dark Matter in the nMSSM Electroweak Baryogenesis and Dark Matter in the nMSSM

2004-04-21

arxiv.org/abs/hep-ph/0404184v1

Phys.Rev.D70:035005,2004

Physics

High Energy Physics

High Energy Physics - Phenomenology

32 pages, 9 postscript figures, LateX

Scientific paper

10.1103/PhysRevD.70.035005

We examine the possibility of electroweak baryogenesis and dark matter in the nMSSM, a minimal extension of the MSSM with a singlet field. This extension avoids the usual domain wall problem of the NMSSM, and also appears as the low energy theory in models of dynamical electroweak symmetry breaking with a so-called fat-Higgs boson. We demonstrate that a strong, first order electroweak phase transition, necessary for electroweak baryogenesis, may arise in regions of parameter space where the lightest neutralino provides an acceptable dark matter candidate. We investigate the parameter space in which these two properties are fulfilled and discuss the resulting phenomenology. In particular, we show that there are always two light CP-even and one light CP-odd Higgs bosons with masses smaller than about 250 GeV. Moreover, in order to obtain a realistic relic density, the lightest neutralino mass tends to be smaller than $M_Z/2$, in which case the lightest Higgs boson decays predominantly into neutralinos.

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