arXiv : Status of the scalar singlet dark matter model

Athron, Peter; Edsjö, Joakim; Savage, Christopher; Dal, Lars A.; Kahlhoefer, Felix; Farmer, Ben; Rogan, Christopher; Kvellestad, Anders; White, Martin; Putze, Antje; Chrząszcz, Marcin; Balázs, Csaba; Serra, Nicola; Cornell, Jonathan M.; Saavedra, Aldo; Krislock, Abram; McKay, James; Jackson, Paul; Weniger, Christoph; Buckley, Andy; Bringmann, Torsten; Martinez, Gregory D.; Scott, Pat; Mahmoudi, Farvah; Conrad, Jan; Raklev, Are

doi:10.1140/epjc/s10052-017-5113-1

Published Articles
Report number	arXiv:1705.07931 ; COEPP-MN-17-10 ; CERN-TH-2017-170 ; NORDITA 2017-079 ; CoEPP-MN-17-10 ; gambit-physics ; gambit-physics-2017
Title	Status of the scalar singlet dark matter model
Author(s)	Athron, Peter (Monash U.) ; Balázs, Csaba (Monash U.) ; Bringmann, Torsten (Oslo U.) ; Buckley, Andy (Glasgow U.) ; Chrząszcz, Marcin (Cracow, INP ; Zurich U.) ; Conrad, Jan (Stockholm U. ; Stockholm U., OKC) ; Cornell, Jonathan M. (McGill U.) ; Dal, Lars A. (Oslo U.) ; Edsjö, Joakim (Stockholm U. ; Stockholm U., OKC) ; Farmer, Ben (Stockholm U. ; Stockholm U., OKC) ; Jackson, Paul (Adelaide U.) ; Kahlhoefer, Felix (DESY) ; Krislock, Abram (Oslo U.) ; Kvellestad, Anders (Nordita) ; McKay, James (Imperial Coll., London) ; Mahmoudi, Farvah (IUF, Paris ; CERN ; Lyon Observ.) ; Martinez, Gregory D. (UCLA) ; Putze, Antje (Annecy, LAPTH) ; Raklev, Are (Oslo U.) ; Rogan, Christopher (Harvard U.) ; Saavedra, Aldo (Sydney U. ; ARC, CoEPP, Australia) ; Savage, Christopher (Nordita) ; Scott, Pat (Imperial Coll., London) ; Serra, Nicola (Zurich U.) ; Weniger, Christoph (U. Amsterdam, GRAPPA) ; White, Martin (Adelaide U.)
Publication	2017-08-23
Imprint	2017-05-22
Number of pages	17
Note	19 pages, 5 figures, matches published version. v3 updates the Zenodo URL for supplementary data (available at https://doi.org/10.5281/zenodo.801510)
In:	Eur. Phys. J. C 77 (2017) 568
DOI	10.1140/epjc/s10052-017-5113-1 (publication)
Subject category	astro-ph.CO ; Astrophysics and Astronomy ; hep-ph ; Particle Physics - Phenomenology
Accelerator/Facility, Experiment	GAMBIT
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.
Copyright/License	preprint: (License: arXiv nonexclusive-distrib 1.0) publication: © The Author(s) 2017 (License: CC-BY-4.0), sponsored by SCOAP³

$Profile likelihoods for the scalar singlet model, in the plane of the singlet parameters $\lhs$ and $\ms$. Contour lines mark out the $1\sigma$ and $2\sigma$ confidence regions. The left panel shows the resonance region at low singlet mass, whereas the right panel shows the full parameter range scanned. The best-fit (maximum likelihood) point is indicated with a white star, and edges of the allowed regions corresponding to solutions where $S$ constitutes 100\% of dark matter are indicated in orange.$ $Profile likelihoods for the scalar singlet model, in the plane of the singlet parameters $\lhs$ and $\ms$. Contour lines mark out the $1\sigma$ and $2\sigma$ confidence regions. The left panel shows the resonance region at low singlet mass, whereas the right panel shows the full parameter range scanned. The best-fit (maximum likelihood) point is indicated with a white star, and edges of the allowed regions corresponding to solutions where $S$ constitutes 100\% of dark matter are indicated in orange.$ $Profile likelihoods for the scalar singlet model, in various planes of observable quantities against the singlet mass. Contour lines mark out the $1\sigma$ and $2\sigma$ confidence regions. Greyed regions indicate values of observables that are inaccessible to our scans, as they correspond to non-perturbative couplings $\lhs>10$, which lie outside the region of our scan. Note that the exact boundary of this region moves with the values of the nuisance parameters, but we have simply plotted this for fixed central values of the nuisances, as a guide. The best-fit (maximum likelihood) point is indicated with a white star, and edges of the allowed regions corresponding to solutions where $S$ constitutes 100\% of dark matter are indicated in orange. \textit{Left:} late-time thermal average of the cross-section times relative velocity; \textit{Centre:} spin-independent WIMP-nucleon cross-section; \textit{Right:} relic density.$ Show more plots

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Записът е създаден на 2017-05-25, последна промяна на 2021-11-13

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