Status of the scalar singlet dark matter model

Athron, P. et al. (2017) Status of the scalar singlet dark matter model. European Physical Journal C, 77(8), 568. (doi: 10.1140/epjc/s10052-017-5113-1)

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One of the simplest viable models for dark matter is an additional neutral scalar, stabilised by a Z2Z2 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 ∼∼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.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Buckley, Professor Andy
Authors: Athron, P., Balázs, C., Bringmann, T., Buckley, A., Chrząszcz, M., Conrad, J., Cornell, J. M., Dal, L. A., Edsjö, J., Farmer, B., Jackson, P., Kahlhoefer, F., Krislock, A., Kvellestad, A., McKay, J., Mahmoudi, F., Martinez, G. D., Putze, A., Raklev, A., Rogan, C., Saavedra, A., Savage, C., Scott, P., Serra, N., Weniger, C., and White, M.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:European Physical Journal C
ISSN (Online):1434-6052
Published Online:23 August 2017
Copyright Holders:Copyright © 2017 The Authors
First Published:First published in European Physical Journal C 77(8): 568
Publisher Policy:Reproduced under a Creative Commons license

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
645361Jet substructure and new physics studies with the ATLAS experimentAndrew BuckleyThe Royal Society (ROYSOC)UF110191SCHOOL OF PHYSICS & ASTRONOMY