Neutralino Dark Matter in BMSSM Effective Theory

Abstract

We study thermal neutralino dark matter in an effective field theory extension of the MSSM, called "Beyond the MSSM" (BMSSM) in Dine, Seiberg and Thomas (2007). In this class of effective field theories, the field content of the MSSM is unchanged, but the little hierarchy problem is alleviated by allowing small corrections to the Higgs/higgsino part of the Lagrangian. We perform parameter scans and compute the dark matter relic density. The light Higgsino LSP scenario is modified the most; we find new regions of parameter space compared to the standard MSSM. This involves interesting interplay between the WMAP dark matter bounds and the LEP chargino bound. We also find some changes for gaugino LSPs, partly due to annihilation through a Higgs resonance, and partly due to coannihilation with light stops in models that are ruled in by the new effective terms.

37 pages + appendix

References in corpus (9)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• A new measurement of the antiproton-to-proton flux ratio up to 100 GeV in the cosmic radiation
• Non-thermal Dark Matter and the Moduli Problem in String Frameworks
• Higgs Physics as a Window Beyond the MSSM (BMSSM)
• MSSM with Dimension-five Operators (MSSM_5)
• A New Approach to mu-Bmu
• Beyond MSSM Baryogenesis
• Two Higgs Models for Large Tan Beta and Heavy Second Higgs
• The Supersymmetric Higgs