Bino Dark Matter and Big Bang Nucleosynthesis in the Constrained E6SSM with Massless Inert Singlinos

Abstract

We discuss a new variant of the E6 inspired supersymmetric standard model (E6SSM) in which the two inert singlinos are exactly massless and the dark matter candidate has a dominant bino component. A successful relic density is achieved via a novel mechanism in which the bino scatters inelastically into heavier inert Higgsinos during the time of thermal freeze-out. The two massless inert singlinos contribute to the effective number of neutrino species at the time of Big Bang Nucleosynthesis, where the precise contribution depends on the mass of the Z' which keeps them in equilibrium. For example for mZ' > 1300 GeV we find Neff \approx 3.2, where the smallness of the additional contribution is due to entropy dilution. We study a few benchmark points in the constrained E6SSM with massless inert singlinos to illustrate this new scenario.

arXiv comment24 pages, revised for publication in JHEP

References in corpus (20)

• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Supersymmetric Dark Matter
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Likelihoods and Parameters from the WMAP data
• The Soft Supersymmetry-Breaking Lagrangian: Theory and Applications
• Calculations of Neutralino-Stau Coannihilation Channels and the Cosmologically Relevant Region of MSSM Parameter Space
• The primordial abundance of 4He: evidence for non-standard big bang nucleosynthesis
• Neutralino relic density in minimal supergravity with co-annihilations
• Calculations of Neutralino-Stop Coannihilation in the CMSSM
• A New Approach to Systematic Uncertainties and Self-Consistency in Helium Abundance Determinations
• Exceptional Supersymmetric Standard Model
• Gauge Coupling Unification in the Exceptional Supersymmetric Standard Model
• Predictions of the Constrained Exceptional Supersymmetric Standard Model
• Minimal E_6 Supersymmetric Standard Model
• Natural Dark Matter in SUSY GUTs with Non-universal Gaugino Masses
• Solving the Flavour Problem in Supersymmetric Standard Models with Three Higgs Families
• Neutralino Dark Matter in the USSM
• Neutralino Dark Matter with Inert Higgsinos and Singlinos
• Dark Matter in the MSSM
• Natural Implementation of Neutralino Dark Matter
• The Fine-Tuning Price of Neutralino Dark Matter in Models with Non-Universal Higgs Masses

Cited by in corpus (23)

• Constrained Exceptional Supersymmetric Standard Model with a Higgs Near 125 GeV
• 750 GeV Diphoton Resonance from Singlets in an Exceptional Supersymmetric Standard Model
• GUT Physics in the era of the LHC
• E6 inspired SUSY models with exact custodial symmetry
• Dark Radiation or Warm Dark Matter from long lived particle decays in the light of Planck
• $E_6$ Inspired SUSY Benchmarks, Dark Matter Relic Density and a 125 GeV Higgs
• Probing dark radiation with inflationary gravitational waves
• Warm Dark Matter from keVins
• Threshold Corrections in the Exceptional Supersymmetric Standard Model
• Dark Matter in a Constrained $E_6$ Inspired SUSY Model
• Dark Radiation Confronting LHC in Z' Models
• Non-Gaussian isocurvature perturbations in dark radiation
• Multi-component Dark Matter in a Simplified E${}_6$SSM Model
• Z' mass limits and the naturalness of supersymmetry
• Dark matter candidates in the constrained Exceptional Supersymmetric Standard Model
• Discovering $E_6$ SUSY models in gluino cascade decays at the LHC
• Higgs Bosons in supersymmetric U(1)' models with CP Violation
• NMSSM+
• Monophoton signals in electron-positron colliders in a simplified E6SSM
• Leptogenesis and Dark Matter-Nucleon Scattering Cross Section in the SE6SSM
• TeV-scale leptoquark searches at the LHC and their E${}_6$SSM Interpretation
• A combined approach to the analysis of space and ground experimental data within a simplified E6SSM
• Interactions of exotic neutralino dark matter with nucleons in $U(1)$ extensions of the MSSM originating from $E_6$ GUTs