Viable dark matter via radiative symmetry breaking in a scalar singlet Higgs portal extension of the standard model

Abstract

We consider generation of dark matter mass via radiative electroweak symmetry breaking in an extension of the conformal Standard Model containing a singlet scalar field with a Higgs portal interaction. Generating the mass from a sequential process of radiative electroweak symmetry breaking followed by a conventional Higgs mechanism can account for less than 35% of the cosmological dark matter abundance for dark matter mass $M_s>80GeV$. However in a dynamical approach where both Higgs and scalar singlet masses are generated via radiative electroweak symmetry breaking we obtain much higher levels of dark matter abundance. At one-loop level we find abundances of 10%--100% with $106GeV<M_s<120GeV$. However, when the higher-order effects needed for consistency with a $125GeV$ Higgs mass are estimated, the abundance becomes 10%--80% for $80GeV<M_s<96GeV$, representing a significant decrease in the dark matter mass. The dynamical approach also predicts a small scalar-singlet self-coupling, providing a natural explanation for the astrophysical observations that place upper bounds on dark matter self-interaction. The predictions in all three approaches are within the $M_s>80GeV$ detection region of the next generation XENON experiment.

5 pages one figure. v3 contains extended discussion and updated references

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