Electroweak Baryogenesis and Dark Matter via a Pseudoscalar vs. Scalar

Abstract

We study the electroweak baryogenesis in a fermionic dark matter scenario with a (pseudo)scalar being the mediator in the Higgs portal. It is discussed that the electroweak phase transition turns to be first-order after taking into account the role of the (pseudo)scalar in the thermal effective potential in our extended standard model. Imposing the relic density constraint from the WMAP/Planck and the bounds from the direct detection experiments XENON100/LUX, we show that the dark matter scenario with a scalar mediator is hardly capable of explaining the baryogenesis while the same model with a pseudoscalar mediator is able to explain the baryon asymmetry. For the latter, we constrain more the model with {\it Fermi}-LAT upper limit on dark matter annihilation into $b\bar{b}$ and ${\tau }^{+}{\tau }^{-}$. The allowed dark matter mass that leads to correct relic abundance, renders the electroweak phase transition strongly first-order, and respects the {\it Fermi}-LAT limit, will be in the range $110-320$ GeV. The exotic and invisible Higgs decay bounds and the mono-jet search limit at the LHC do not affect the viable space of parameters.

15 pages, 4 figures. Fermi-LAT constraint on DM DM to b\bar, tau^+ tau^- in the model was imposed. The range of the mediator mass was shown in a figure. Published in JHEP

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• Filtered pseudo-scalar dark matter and gravitational waves from first order phase transition
• Cornering pseudoscalar-mediated dark matter with the LHC and cosmology
• Electroweak baryogenesis in the Z3-invariant NMSSM
• Strong electroweak phase transition in $t$-channel simplified dark matter models
• Electroweak Phase Transition in Scale Invariant Standard Model
• Leading Loop Effects in Pseudoscalar-Higgs Portal Dark Matter
• Strongly first-order electroweak phase transition by relatively heavy additional Higgs bosons
• Higgs inflation and cosmological electroweak phase transition with N scalars in the post-Higgs era
• Dark matter and electroweak phase transition in the mixed scalar dark matter model
• Phenomenological analysis of multi-pseudoscalar mediated dark matter models
• Shedding light on the electroweak phase transition from exotic Higgs boson decays at the lifetime frontiers
• Renormalization group equation analysis of a pseudoscalar portal dark matter model