Combined analysis of effective Higgs portal dark matter models

Beniwal, Ankit; Rajec, Filip; Savage, Christopher; Scott, Pat; Weniger, Christoph; White, M. J.; Williams, Anthony G.

doi:10.1103/physrevd.93.115016

Cited by 93 publications

(127 citation statements)

References 174 publications

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“…a part of the parameter space spanned by the fermion mass M ψ and the Higgs-portal couplingλ hψ , see, e.g., [11]. In the effective field theory setting, the mass and the portal coupling are independent free parameters.…”

Section: Jhep08(2018)147mentioning

confidence: 99%

Asymptotic safety in the dark

Eichhorn¹,

Held²,

Griend

2018

J. High Energ. Phys.

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We explore the Renormalization Group flow of massive uncharged fermions -a candidate for dark matter -coupled to a scalar field through a Higgs portal. We find that fermionic fluctuations can lower the bound on the scalar mass that arises from vacuum stability. Further, we discuss that despite the perturbative nonrenormalizability of the model, it could be ultraviolet complete at an asymptotically safe fixed point. In our approximation, this simple model exhibits two mechanisms for asymptotic safety: a balance of fermionic and bosonic fluctuations generates a fixed point in the scalar self-interaction; asymptotic safety in the portal coupling is triggered through a balance of canonical scaling and quantum fluctuations. As a consequence of asymptotic safety in the dark sector, the low-energy value of the portal coupling could become a function of the dark fermion mass and the scalar mass, thereby reducing the viable parameter space of the model.

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Section: Jhep08(2018)147mentioning

confidence: 99%

Asymptotic safety in the dark

Eichhorn¹,

Held²,

Griend

2018

J. High Energ. Phys.

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“…We also apply the constraint λ hS < 10, as larger values would violate perturbative unitarity and are therefore not physically interesting. More details on the model can be found in accompanying and earlier papers [29,35,[55][56][57][58][59][60][61][62]. Here our test function consists of the same likelihood components as in Ref.…”

Section: Scanner Performance Comparisonsmentioning

confidence: 99%

Comparison of statistical sampling methods with ScannerBit, the GAMBIT scanning module

Martinez¹,

McKay²,

Farmer³

et al. 2017

Eur. Phys. J. C

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102

160

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We introduce ScannerBit, the statistics and sampling module of the public, open-source global fitting framework GAMBIT. ScannerBit provides a standardised interface to different sampling algorithms, enabling the use and comparison of multiple computational methods for inferring profile likelihoods, Bayesian posteriors, and other statistical quantities. The current version offers random, grid, raster, nested sampling, differential evolution, Markov Chain Monte Carlo (MCMC) and ensemble Monte Carlo samplers. We also announce the release of a new standalone differential evolution sampler, Diver, and describe its design, usage and interface to ScannerBit. We subject Diver and three other samplers (the nested sampler MultiNest, the MCMC GreAT, and the native ScannerBit implementation of the ensemble Monte Carlo algorithm T-Walk) to a battery of statistical tests. For this we use a realistic physical likelihood function, based on the scalar singlet model of dark matter. We examine the performance of each sampler as a function of its adjustable settings, and the dimensionality of the sampling problem. We evaluate performance on four metrics: optimality of the best fit found, completeness in exploring the best-fit region, number of likelihood evaluations, and total runtime. For Bayesian posterior estimation at high resolution, T-Walk provides the most accurate and timely mapping of the full parameter space. For profile likelihood analysis in less than about ten dimensions, we find that Diver and MultiNest score similarly in terms of best fit and speed, outperforming GreAT a

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“…essentially the one of a Higgs-portal Majorana DM. By adapting the results of [15], by means of the replacement…”

Section: Jhep07(2017)047mentioning

confidence: 99%

“…the results of [15] give 55 GeV < m N < 62.5 GeV and ξ 0.14 × q 10 m ψ 100 GeV × c res , (3.11) where c res varies between 1 (for m N 55 GeV) and 0.2 (for m N 62 GeV). Finally, this scenario also works near the S 1 resonances, i.e.…”

Section: Jhep07(2017)047mentioning

confidence: 99%

A clockwork WIMP

Hambye

Teresi

Tytgat

2017

J. High Energ. Phys.

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We embed a thermal dark matter (DM) candidate within the clockwork framework. This mechanism allows to stabilize the DM particle over cosmological time because it suppresses its decay into Standard Model (SM) particles. At the same time, pair annihilations are unsuppressed, so that the relic density is set by the usual freeze-out of the DM particle from the thermal bath. The slow decay of the DM candidate is induced by "clockwork" particles that can be quite light (rather than at some GUT or Planck scale) and could be searched for at current or future colliders. According to the scenario considered, the very same particles also mediate the annihilation process, thus providing a connection between DM annihilation and DM decay, and fixing the mass scale of the clockwork states, otherwise unconstrained, to be in the TeV range or lighter. We then show how this setup can minimally emerge from the deconstruction of an extra dimension in flat spacetime. Finally, we argue that the clockwork mechanism that we consider could induce Majorana neutrino masses, with a seesaw scale of order TeV or less and Yukawa couplings of order unity.

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Combined analysis of effective Higgs portal dark matter models

Cited by 93 publications

References 174 publications

Asymptotic safety in the dark

Asymptotic safety in the dark

Comparison of statistical sampling methods with ScannerBit, the GAMBIT scanning module

A clockwork WIMP

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