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Status of the scalar singlet dark matter model
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abstract
One of the simplest viable models for dark matter is an additional neutral scalar, stabilised by a $\mathbb{Z}_2$ symmetry. Using the GAMBIT package and combining results from four independent samplers, we present Bayesian and frequentist global fits of this model. We vary the singlet mass and coupling along with 13 nuisance parameters, including nuclear uncertainties relevant for direct detection, the local dark matter density, and selected quark masses and couplings. We include the dark matter relic density measured by Planck, direct searches with LUX, PandaX, SuperCDMS and XENON100, limits on invisible Higgs decays from the Large Hadron Collider, searches for high-energy neutrinos from dark matter annihilation in the Sun with IceCube, and searches for gamma rays from annihilation in dwarf galaxies with the Fermi-LAT. Viable solutions remain at couplings of order unity, for singlet masses between the Higgs mass and about 300 GeV, and at masses above $\sim$1 TeV. Only in the latter case can the scalar singlet constitute all of dark matter. Frequentist analysis shows that the low-mass resonance region, where the singlet is about half the mass of the Higgs, can also account for all of dark matter, and remains viable. However, Bayesian considerations show this region to be rather fine-tuned.
Forward citations
Cited by 6 Pith papers
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Mixed Freeze-In and Freeze-Out Histories and Dark-Sector Decays in a $\mathbb{Z}_4$ Two-Scalar Model
A Z4 two-scalar Higgs-portal dark matter model stays viable under LZ exclusions when one or both scalars are produced via freeze-in, and late dark-sector decays generate SuperWIMP, injection-assisted freeze-out, and s...
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Computing singlet scalar freeze-out with plasmon and plasmino states
A full thermal-resummation computation shows that plasmon and plasmino corrections leave the TeV-scale singlet scalar annihilation cross section essentially unchanged, reconfirming existing relic density constraints.
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Two-real-scalar-singlet extension of the SM: LHC phenomenology and benchmark scenarios
The two-real-singlet extension of the Standard Model can produce sizable rates for asymmetric and cascade Higgs-to-Higgs decays at the LHC, and the paper supplies six benchmark planes for those signatures.
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Dark Matter in the General 2HDM with Extra Top Yukawa Couplings
G2HDM plus a Z2-odd real scalar singlet yields viable top-window dark matter and six LHC benchmarks, including flavor-violating mono-top production of invisible H→SS.
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The Simplest Dark Matter Model at the Edge of Perturbativity
At next-to-leading order, the real scalar singlet dark matter model is viable only for masses above about 20 TeV, and the complex scalar version is excluded in its perturbative regime.
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Perturbative gravitational wave predictions for the real-scalar extended Standard Model
At next-to-next-to-leading order, gravitational wave predictions for the real-scalar singlet extension of the Standard Model appear to converge for typical parameters, but break down for the strongest, observable signals.
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