A Two-Singlet Model for Light Cold Dark Matter

Abstract

We extend the Standard Model by adding two gauge-singlet ${\mathbb{Z}}_2$% -symmetric scalar fields that interact with visible matter only through the Higgs particle. One is a stable dark matter WIMP, and the other one undergoes a spontaneous breaking of the symmetry that opens new channels for the dark matter annihilation, hence lowering the mass of the WIMP. We study the effects of the observed dark matter relic abundance on the annihilation cross section and find that in most regions of the parameters space, light dark matter is viable. We also compare the elastic scattering cross-section of our dark matter candidate off nucleus with existing (CDMSII and XENON100) and projected (SuperCDMS and XENON1T) experimental exclusion bounds. We find that most of the allowed mass range for light dark matter will be probed by the projected sensitivity of XENON1T experiment.

30 pages, 17 figures

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• Building and testing models with extended Higgs sectors
• Multi-Scalar-Singlet Extension of the Standard Model - the Case for Dark Matter and an Invisible Higgs Boson
• Hints of Standard Model Higgs Boson at the LHC and Light Dark Matter Searches
• A Possible Explanation of Low Energy $\gamma$-ray Excess from Galactic Centre and Fermi Bubble by a Dark Matter Model with Two Real Scalars
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• Light Dark Matter, Light Higgs and the Electroweak Phase Transition
• Higgs Phenomenology in the Two-Singlet Model
• Two Real Scalar WIMP Model in the Assisted Freeze-Out Scenario
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• An update on the two singlet Dark Matter model
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• Naturalness Implications within the Two-Real-Scalar-Singlet beyond the SM
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• Scalar dark matter and Muon $g-2$ in a $U(1{)}_{L_{\mu }-L_{\tau }}$ model
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• Phase transition in multi-scalar-singlet extensions of the Standard Model
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• Identifying the nature of dark matter at $e^{-}{e}^{+}$ Colliders
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• Determining the masses of invisible particles: Application to Higgs boson invisible decay