Status of the scalar singlet dark matter model
Résumé
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.
Mots clés
singlet: scalar
dark matter: singlet
dark matter: relic density
dark matter: annihilation
dark matter: density
Higgs particle: mass
quark: mass
frequentist
Bayesian
dark matter: direct detection
interpretation of experiments: CERN LHC Coll
gamma ray
stability
IceCube
satellite: Planck
galaxy
interpretation of experiments: XENON
interpretation of experiments: GLAST
interpretation of experiments: CDMS
LUX