Simplified models of dark matter with a long-lived co-annihilation partner

Khoze, Valentin V.; Plascencia, Alexis D.; Sakurai, Kazuki

doi:10.1007/jhep06(2017)041

Cited by 35 publications

(37 citation statements)

References 162 publications

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“…The processes responsible for the DM relic density and its eventual detection can be described by simple extensions of the SM in which a DM candidate interacts with the SM states (typically the interactions are limited to the SM fermions) through a mediator state (dubbed portal). This idea is at the base of the so-called "Simplified Models" [140][141][142][143][144][145][146][147][148][149][150][151][152][153][154] which are customarily adopted especially in the context of collider studies, see e.g., Refs. [130,[155][156][157][158][159][160][161][162][163][164][165][166].…”

Section: Model Setup: Dark Portalsmentioning

confidence: 99%

The waning of the WIMP? A review of models, searches, and constraints

et al. 2018

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Weakly Interacting Massive Particles (WIMPs) are among the best-motivated dark matter candidates. No conclusive signal, despite an extensive search program that combines, often in a complementary way, direct, indirect, and collider probes, has been detected so far. This situation might change in near future due to the advent of one/multi-TON Direct Detection experiments. We thus, find it timely to provide a review of the WIMP paradigm with focus on a few models which can be probed at best by these facilities. Collider and Indirect Detection, nevertheless, will not be neglected when they represent a complementary probe.

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Section: Model Setup: Dark Portalsmentioning

confidence: 99%

The waning of the WIMP? A review of models, searches, and constraints

et al. 2018

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“…Here, we should note that the scenario with a long-lived co-annihilation partner is considered in refs. [20,62].…”

Section: E the Properties Of New Heavy Particles And Hadronic Dark Mmentioning

confidence: 99%

Hadronic and Hadron-Like Physics of Dark Matter

et al. 2019

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The problems of simple elementary weakly interacting massive particles (WIMPs) appeal to extend the physical basis for nonbaryonic dark matter. Such extension involves more sophisticated dark matter candidates from physics beyond the Standard Model (BSM) of elementary particles. We discuss several models of dark matter, predicting new colored, hyper-colored or techni-colored particles and their accelerator and non-accelerator probes. The nontrivial properties of the proposed dark matter candidates can shed new light on the dark matter physics. They provide interesting solutions for the puzzles of direct and indirect dark matter search. *

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“…Both χ and φ are odd under the Z 2 symmetry while the SM fields are even and we assume m φ > m χ . The standard WIMP phenomenology of (1) has already been studied in length in [30][31][32][33][34][35][36] while the corresponding scalar DM case has been studied in [37][38][39][40][41][42]. 1 Here in contrast, we extend existing analysis to couplings λ χ bringing the dark matter out of chemical equilibrium (CE) focusing on small mass splittings between the dark matter and the mediator.…”

Section: The Simplified Leptophilic Dark Matter Modelmentioning

confidence: 99%

A feeble window on leptophilic dark matter

Junius

Lopez-Honorez

Mariotti

2019

J. High Energ. Phys.

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In this paper we study a leptophilic dark matter scenario involving feeble dark matter coupling to the Standard Model (SM) and compressed dark matter-mediator mass spectrum. We consider a simplified model where the SM is extended with one Majorana fermion, the dark matter, and one charged scalar, the mediator, coupling to the SM leptons through a Yukawa interaction. We first discuss the dependence of the dark matter relic abundance on the Yukawa coupling going continuously from freeze-in to freeze-out with an intermediate stage of conversion driven freeze-out. Focusing on the latter, we then exploit the macroscopic decay length of the charged scalar to study the resulting long-lived-particle signatures at collider and to explore the experimental reach on the viable portion of the parameter space. e.g. [1][2][3][4]. In some parts of this parameter space, the DM happens to be very feebly coupled to the SM, i.e. with couplings much more suppressed than for the WIMP case.We focus on this feeble interaction window for scenarios involving a small mass splitting between the dark matter and the mediator connecting DM to the SM. We will study in details the mechanism of dark matter production in the early universe, from freezein to freeze-out. In particular, we will mainly focus on the intermediate stage of DM coannihilation freeze-out happening out of chemical equilibrium (CE) with the SM plasma, also called conversion driven freeze-out. Such a scenario has already been pointed out in [3] and mainly studied for dark matter coupling to quarks [3,5,6]. Here instead we focus on the case of a leptophilic dark matter model. Conversion processes between the mediator and the dark matter will play a central role in defining the evolution of the DM abundance and they will have to be taken into account in the study of the DM/mediator Boltzmann equations. In passing, we will also emphasize the fact that, within the freeze-in framework, mediator scatterings (as opposed to decay) can play a leading role in determining the DM relic density. Finally, we will identify the viable parameter space for conversion driven freeze-out so as to further study the experimental constraints on this class of models.The feeble coupling of the DM to the mediator allows for a macroscopic decay length of the mediator that can be observed at colliders through e.g. charged and/or disappearing tracks. These are typical features of DM scenarios in which the DM abundance results from the freeze-in [4] and conversion driven freeze-out [3]. These production mechanisms can lead to distinctive and challenging signatures at colliders, including long lived charged particles and very soft signatures. In the freeze-in case, the DM coupling is so suppressed that the mediator mainly decays outside the detector giving rise to charged tracks. For conversion driven freeze-out, the slightly larger couplings involved can also give rise to disappearing tracks. The LHC community has already provided a strong effort in the study of final state signatures which arise from DM mo...

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Simplified models of dark matter with a long-lived co-annihilation partner

Cited by 35 publications

References 162 publications

The waning of the WIMP? A review of models, searches, and constraints

The waning of the WIMP? A review of models, searches, and constraints

Hadronic and Hadron-Like Physics of Dark Matter

A feeble window on leptophilic dark matter

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