WIMP dark matter through the dilaton portal

We study a scenario in which the dilaton, a pseudo-Goldstone boson of the spontaneous breaking of conformal symmetry, provides a portal between dark matter and the visible sector. We consider the low-energy description of the theory in which the dilaton mixes with the Standard Model Higgs boson, thereby predicting a second scalar at or above the weak scale. We derive the collider and dark matter constraints on the corresponding parameter space and find that existing experimental data point towards the decoupling limit in which the CFT scale is well above the electroweak scale. Moreover, the thermal production of dark matter implies its mass is likely above the TeV scale. Upcoming direct detection experiments may allow for the discovery of the dilaton-mediated thermal dark matter while future collider studies will also be sensitive to the available parameter space.

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“…Both of these limits are consistent with perturbative expansion, and we consider them in our analysis. (See also [12]. )…”

Section: Frameworkmentioning

confidence: 96%

“…The ATLAS [23] and CMS [24] rather broad, in the scenario at hand it is not necessarily so. Indeed, one finds (12) so that the heavier scalar can appear as a wide or a narrow resonance. In the numerical analysis described in section 4 we consider both options (see Ref.…”

Section: Heavy Scalar Searchesmentioning

confidence: 99%

Constraining the Higgs-dilaton with LHC and dark matter searches

et al. 2015

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“…This is the well-known "Higgs Portal" scenario for dark matter [130][131][132][133][134][135][136][137][138][139][140][141][142][143][144][145][146][147][148][149] (similarly, one could consider the "dilaton" portal [150][151][152][153]). …”

Section: Higgs Mediatorsmentioning

confidence: 99%

Scalar simplified models for dark matter

2015

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We introduce a set of minimal simplified models for dark matter interactions with the Standard Model, connecting the two sectors via either a scalar or pseudoscalar particle. These models have a wider regime of validity for dark matter searches at the LHC than the effective field theory approach, while still allowing straightforward comparison to results from non-collider dark matter detection experiments. Such models also motivate dark matter searches in multiple correlated channels. In this paper, we constrain scalar and pseudoscalar simplified models with direct and indirect detection experiments, as well as from existing LHC searches with missing energy plus tops, bottoms, or jets, using the exact loop-induced coupling with gluons. This calculation significantly affects key differential cross sections at the LHC, and must be properly included. We make connections with the Higgs sector, and conclude with a discussion of future searches at the LHC.

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“…A.2. Notice that massless gauge fields do not contribute to the trace of the energy-momentum tensor, but they generate effective couplings from two different sources: quarks and W bosons loops contribution and the trace anomaly [44].…”

Section: (227)mentioning

confidence: 99%

Gravity-mediated dark matter in clockwork/linear dilaton extra-dimensions

Folgado

Donini

Rius

2020

J. High Energ. Phys.

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We study for the first time the possibility that Dark Matter (represented by particles with spin 0, 1/2 or 1) interacts gravitationally with Standard Model particles in an extra-dimensional Clockwork/Linear Dilaton model. We assume that both, the Dark Matter and the Standard Model, are localized in the IR-brane and only interact via gravitational mediators, namely the Kaluza-Klein (KK) graviton and the radion/KK-dilaton modes. We analyse in detail the Dark Matter annihilation channel into Standard Model particles and into two on-shell Kaluza-Klein towers (either two KK-gravitons, or two radion/KK-dilatons, or one of each), finding that it is possible to obtain the observed relic abundance via thermal freeze-out for Dark Matter masses in the range m DM ∈ [1, 15] TeV for a 5-dimensional gravitational scale M 5 ranging from 5 to a few hundreds of TeV, even after taking into account the bounds from LHC Run II and irrespectively of the DM particle spin.

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WIMP dark matter through the dilaton portal

Cited by 33 publications

References 48 publications

Constraining the Higgs-dilaton with LHC and dark matter searches

Constraining the Higgs-dilaton with LHC and dark matter searches

Scalar simplified models for dark matter

Gravity-mediated dark matter in clockwork/linear dilaton extra-dimensions

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