Simplified Dark Matter Models

Morgante, Enrico

doi:10.1155/2018/5012043

Cited by 22 publications

(15 citation statements)

References 137 publications

(179 reference statements)

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“…(14) and Eq. (15). It is not difficult now to explain our results: When g 12 = 0, in order to get a large enough annihilation cross section (to induce the observed relic density) large value for the coupling g 1 is required.…”

Section: Direct Detectionmentioning

confidence: 74%

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Split fermionic WIMPs evade direct detection

Ghorbani

2018

J. High Energ. Phys.

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We consider a model with two gauge singlet fermionic WIMPs communicating with the SM particles by a singlet scalar mediator via a Higgs portal. While the light WIMP is stable and plays the role of the dark matter (DM) candidate, the heavy partner is a short-lived WIMP without contribution to the current DM relic density. Along with the coannihilation effects the heavy WIMP, acting as a mediator in t-and u-channel DM annihilation cross sections, has a significant effect in finding the viable parameter space against the direct detection constraints provided by XENON1t and LUX experiments. This is an extension to the minimal singlet fermionic DM model whose entire parameter space (except a resonance region) excluded by the latest direct detection experiments. It is found out that there are viable regions in the parameter space which evade direct detection upper bounds and respect the observed DM relic density by WMAP/Planck. We also found that the Fermi-LAT upper limits on the DM annihilation cross section into bb can exclude small regions of the viable parameter space which elude direct detection experiments. This model exemplifies a case within the WIMP paradigm whose DM candidate can escape direct detection experiments nontrivially. Such models are interesting to be studied in collider experiments like the LHC.

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Section: Direct Detectionmentioning

confidence: 74%

“…In building the WIMP models, the most minimal extensions to the SM look rationale to begin with. For a recent review on the various DM simplified models see [15] and references therein. The singlet scalar DM model [16,17,18] and the singlet fermionic DM model [19,20,21] exemplify the most minimal renormalizable WIMP models.…”

Section: Introductionmentioning

confidence: 99%

Split fermionic WIMPs evade direct detection

Ghorbani

2018

J. High Energ. Phys.

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“…This plays an important role in the resulting phenomenology, as we are going to discuss in detail. It is also noteworthy that such an interference term would be present also in the case of the analogous exchange of two scalar mediators [18][19][20]30].…”

Section: Vector Bi-portal Model At Direct Detection Experimentsmentioning

confidence: 99%

Dark biportals at direct detection

Einfalt¹,

Kulkarni²,

Procura³

et al. 2021

Preprint

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We present a study of the constraining power of low-threshold, high-resolution direct detection experiments for a bi-portal simplified dark matter model. In the scenario we consider here, dark matter and Standard Model particles interact through two dark vector mediators, one light and one heavy with respect to the momentum transfer in the experiment. Interference effects at the level of scattering amplitudes can lead to novel marked shape features in the differential recoil spectra, which are best exploited by highresolution, low-threshold experiments. We identify the region in parameters space for our model where such effects are dominant and show that composite-target experiments with large atomic mass differences are ideal to explore these scenarios. We develop a profile likelihood approach to analyze presently available and future data. Using published results by the CRESST-III experiment and projections of future sensitivities for the COSINUS experiment, we constrain the parameter space in our model, thereby showing the potential of such an analysis on a class of dark matter models which exhibit non-standard features in the recoil spectra.

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“…To this end, in the eDMeft approach [1], the field content was enlarged by a dynamical (pseudo-)scalar (and potentially light) mediator S to the dark sector, the latter being represented by a scalar or fermionic field χ. Since both the mediator and the DM are assumed to be singlets under the SM gauge group, they can in principle interact via renormalizable couplings, however fully consistent interactions of the mediator with SM fermions (or gauge bosons) require D = 5 operators due to gauge invariance -which are not incorporated in typical simplified DM models [4][5][6][7]. In the eDMeft such couplings are included properly in the EFT framework, which is then consistently truncated at the D = 5 order, leading to a well controllable number of new parameters and avoiding the need to stick to a specific UV completion.…”

Section: Introduction and Setupmentioning

confidence: 99%

Di-jet/$e^+e^-$+ MET to Probe $Z_2-$Odd Mediators to the Dark Sector

Goertz,

Tame-Narvaez,

Tenorth

2019

Preprint

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We explore a scenario where Dark Matter (DM) couples to the Standard Model mainly via a scalar mediator S that is odd under a Z2 symmetry, leading to interesting collider signatures. In fact, if linear interactions with the mediator are absent the most important DM production mechanisms at colliders could lead to final states with missing transverse energy (MET) in association with at least two fermions, such as di-jet or di-electron signatures. The framework we consider is modelindependent, in a sense that it is only based on symmetry and formulated in the (extended) DM Effective Field Theory (eDMeft) approach. Moreover, it allows to address the smallness of firstgeneration fermion masses via suppressed Z2 breaking effects. From a di-jet + MET analysis at the LHC, we find rather loose bounds on the effective S-S-DM-DM interactions, unless the mediator couples very strongly to SM fermions, while a future e + e − collider, such as CLIC, could deliver tighter constraints on the corresponding model parameters, given the mediator is leptophilic. We finally highlight the parameter space that allows to produce the observed DM density, including constraints from direct-detection experiments.

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Simplified Dark Matter Models

Abstract: I review the construction of Simplified Models for Dark Matter searches. After discussing the philosophy and some simple examples, I turn the attention to the aspect of the theoretical consistency and to the implications of the necessary extensions of these models.

Cited by 22 publications

References 137 publications

Split fermionic WIMPs evade direct detection

Split fermionic WIMPs evade direct detection

Dark biportals at direct detection

Di-jet/$e^+e^-$+ MET to Probe $Z_2-$Odd Mediators to the Dark Sector

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