Abstract
We study the implications of the Higgs discovery and of recent results from dark matter searches on real singlet scalar dark matter. The phenomenology of the model is defined by only two parameters, the singlet scalar mass $m_S$ and the quartic coupling $a_2$ between the SU(2) Higgs and the singlet scalar. We concentrate on the window $5 < m_S/{\rm GeV} < 300$. The most dramatic impact on the viable parameter space of the model comes from direct dark matter searches with LUX, and, for very low masses in the few GeV range, from constraints from the invisible decay width of the Higgs. In the resonant region the best constraints come from gamma-ray line searches. We show that they leave only a small region of viable parameter space, for dark matter masses within a few percent of half the mass of the Higgs. We demonstrate that direct and indirect dark matter searches (especially the search for monochromatic gamma-ray lines) will play a key role in closing the residual parameter space in the near future.
Highlights
JHEP03(2015)045 been widely explored [28,29,30,31,32,33]
We study the implications of the Higgs discovery and of recent results from dark matter searches on real singlet scalar dark matter
The most dramatic impact on the viable parameter space of the model comes from direct dark matter searches with LUX, and, for very low masses in the few GeV range, from constraints from the invisible decay width of the Higgs
Summary
The Lagrangian for the model we consider here is defined by the following expression: L. Where μ2 < 0, λ is the quartic coupling for the Higgs, and (−μ2/λ)1/2 = v. This potential is bounded from below, at tree level, provided that λ, b4 ≥ 0, and λb4 ≥ a22 for negative a2. The singlet mass is, at tree level, m2S = b2 + a2v2. The phenomenology of this model is completely determined by the parameters a2 and b2 (or mS), since the self-interaction quartic coupling b4 does not play any phenomenologically observable role The Higgs has been discovered [35, 36], its mass is no longer a free parameter. We have constraints on the invisible Higgs decay h → SS [40,41,42], and both direct [37] and indirect [38] detection limits have improved significantly
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