Status of the scalar singlet dark matter model |
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| Authors: | The GAMBIT Collaboration: Peter Athron Csaba Balázs Torsten Bringmann Andy Buckley Marcin Chrząszcz Jan Conrad Jonathan M. Cornell Lars A. Dal Joakim Edsjö Ben Farmer Paul Jackson Felix Kahlhoefer Abram Krislock Anders Kvellestad James McKay Farvah Mahmoudi Gregory D. Martinez Antje Putze Are Raklev Christopher Rogan Aldo Saavedra Christopher Savage Pat Scott Nicola Serra Christoph Weniger Martin White |
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| Affiliation: | 1.School of Physics and Astronomy,Monash University,Melbourne,Australia;2.Australian Research Council Centre of Excellence for Particle Physics at the Tera-scale, Australia,http://www.coepp.org.au/;3.Department of Physics,University of Oslo,Oslo,Norway;4.SUPA, School of Physics and Astronomy,University of Glasgow,Glasgow,UK;5.Physik-Institut,Universit?t Zürich,Zurich,Switzerland;6.H. Niewodniczański Institute of Nuclear Physics,Polish Academy of Sciences,Kraków,Poland;7.Oskar Klein Centre for Cosmoparticle Physics,AlbaNova University Centre,Stockholm,Sweden;8.Department of Physics,Stockholm University,Stockholm,Sweden;9.Department of Physics,McGill University,Montreal,Canada;10.Department of Physics,University of Adelaide,Adelaide,Australia;11.DESY,Hamburg,Germany;12.NORDITA,Stockholm,Sweden;13.Department of Physics, Blackett Laboratory,Imperial College London,London,UK;14.Univ Lyon, Univ Lyon 1, ENS de Lyon, CNRS, Centre de Recherche Astrophysique de Lyon UMR5574,Saint-Genis-Laval,France;15.Theoretical Physics Department,CERN,Geneva 23,Switzerland;16.Physics and Astronomy Department,University of California,Los Angeles,USA;17.LAPTh, Université de Savoie, CNRS,Annecy-le-Vieux,France;18.Department of Physics,Harvard University,Cambridge,USA;19.Centre for Translational Data Science, Faculty of Engineering and Information Technologies, School of Physics,The University of Sydney,Sydney,Australia;20.GRAPPA, Institute of Physics,University of Amsterdam,Amsterdam,The Netherlands |
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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. |
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