scholarly journals Is a Miracle-less WIMP Ruled out?

2021 ◽  
Vol 11 (2) ◽  
Author(s):  
Jason Arakawa ◽  
Tim Tait
Keyword(s):  
Dark Matter ◽  
Scalar Field ◽  
Parameter Space ◽  
Mass Splitting ◽  
Complementary Information ◽  
Direct Scattering ◽  
Relic Abundance ◽  
Higgs Portal ◽  
Matter Component ◽  
Partner State

We examine a real electroweak triplet scalar field as dark matter, abandoning the requirement that its relic abundance is determined through freeze out in a standard cosmological history (a situation which we refer to as `miracle-less WIMP’). We extract the bounds on such a particle from collider searches, searches for direct scattering with terrestrial targets, and searches for the indirect products of annihilation. Each type of search provides complementary information, and each is most effective in a different region of parameter space. LHC searches tend to be highly dependent on the mass of the SU(2) charged partner state, and are effective for very large or very tiny mass splitting between it and the neutral dark matter component. Direct searches are very effective at bounding the Higgs portal coupling, but ineffective once it falls below \lambda_{\text{eff}} \lesssim 10^{-3}λeff≲10−3. Indirect searches suffer from large astrophysical uncertainties due to the backgrounds and JJ-factors, but do provide key information for \sim∼ 100 GeV to TeV masses. Synthesizing the allowed parameter space, this example of WIMP dark matter remains viable, but only in miracle-less regimes.

scholarly journals 2HDM singlet portal to dark matter

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
M. E. Cabrera ◽  
J. A. Casas ◽  
A. Delgado ◽  
S. Robles
Keyword(s):  
Dark Matter ◽  
Cross Section ◽  
Parameter Space ◽  
Direct Detection ◽  
Single Parameter ◽  
Relic Density ◽  
Relic Abundance ◽  
Higgs Portal ◽  
The Universe

Abstract Higgs portal models are the most minimal way to explain the relic abundance of the Universe. They add just a singlet that only couples to the Higgs through a single parameter that controls both the dark matter relic abundance and the direct detection cross-section. Unfortunately this scenario, either with scalar or fermionic dark matter, is almost ruled out by the latter. In this paper we analyze the Higgs-portal idea with fermionic dark matter in the context of a 2HDM. By disentangling the couplings responsible for the correct relic density from those that control the direct detection cross section we are able to open the parameter space and find wide regions consistent with both the observed relic density and all the current bounds.

scholarly journals Dark Matter production from relativistic bubble walls

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Aleksandr Azatov ◽  
Miguel Vanvlasselaer ◽  
Wen Yin
Keyword(s):  
Phase Transition ◽  
Dark Matter ◽  
Electroweak Phase Transition ◽  
First Order ◽  
Matter Production ◽  
First Order Phase Transition ◽  
Relic Abundance ◽  
Higgs Portal ◽  
First Order Phase ◽  
Gravitational Background

Abstract In this paper we present a novel mechanism for producing the observed Dark Matter (DM) relic abundance during the First Order Phase Transition (FOPT) in the early universe. We show that the bubble expansion with ultra-relativistic velocities can lead to the abundance of DM particles with masses much larger than the scale of the transition. We study this non-thermal production mechanism in the context of a generic phase transition and the electroweak phase transition. The application of the mechanism to the Higgs portal DM as well as the signal in the Stochastic Gravitational Background are discussed.

scholarly journals Two-loop beta function for complex scalar electroweak multiplets

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
Joachim Brod ◽  
Zachary Polonsky
Keyword(s):  
Dark Matter ◽  
Scalar Field ◽  
Irreducible Representation ◽  
Beta Function ◽  
Higher Order ◽  
Radiative Corrections ◽  
Point Interactions ◽  
Complex Scalar ◽  
Complex Scalar Field ◽  
Higgs Portal

Abstract We present the general form of the renormalizable four-point interactions of a complex scalar field furnishing an irreducible representation of SU(2), and derive a set of algebraic identities that facilitates the calculation of higher-order radiative corrections. As an application, we calculate the two-loop beta function for the SM extended by a scalar multiplet, and provide the result explicitly in terms of the group invariants. Our results include the evolution of the Higgs-portal couplings, as well as scalar “minimal dark matter”. We present numerical results for the two-loop evolution of the various couplings.

scholarly journals Searching for Elko dark matter spinors at the CERN LHC

2015 ◽  
Vol 30 (01) ◽  
pp. 1550006 ◽  
Author(s):  
Alexandre Alves ◽  
F. de Campos ◽  
M. Dias ◽  
J. M. Hoff da Silva
Keyword(s):  
Dark Matter ◽  
Hadron Collider ◽  
Higgs Field ◽  
Tree Level ◽  
Dark Matter Candidate ◽  
Mass Dimension ◽  
Quartic Interaction ◽  
Relic Abundance ◽  
Dimension One ◽  
Higgs Portal

The aim of this paper is to explore the possibility of discovering a fermionic field with mass dimension one, the Elko field, in the Large Hadron Collider. Due to its mass dimension, an Elko can only interact either with Standard Model spinors and gauge fields at one-loop order or at tree level through a quartic interaction with the Higgs field. In this Higgs portal scenario, the Elko is a viable candidate to a dark matter constituent which has been shown to be compatible with relic abundance measurements from WMAP and direct dark matter searches. We propose a search strategy for this dark matter candidate in the channel [Formula: see text] at the [Formula: see text] LHC. We show the LHC potential to discover the Elko considering a triple Higgs–Elkos coupling as small as ~0.5 after 1 ab-1 of integrated luminosity. Some phenomenological consequences of this new particle and its collider signatures are also discussed.

scholarly journals Collider probes of real triplet scalar dark matter

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Cheng-Wei Chiang ◽  
Giovanna Cottin ◽  
Yong Du ◽  
Kaori Fuyuto ◽  
Michael J. Ramsey-Musolf
Keyword(s):  
Dark Matter ◽  
Direct Detection ◽  
Hadron Collider ◽  
Mass Splitting ◽  
Dark Matter Candidate ◽  
Soft Pion ◽  
Dark Matter Relic Density ◽  
Pile Up ◽  
Higgs Portal ◽  
Scalar Sector

Abstract We study discovery prospects for a real triplet extension of the Standard Model scalar sector at the Large Hadron Collider (LHC) and a possible future 100 TeV pp collider. We focus on the scenario in which the neutral triplet scalar is stable and contributes to the dark matter relic density. When produced in pp collisions, the charged triplet scalar decays to the neutral component plus a soft pion or soft lepton pair, yielding a disappearing charged track in the detector. We recast current 13 TeV LHC searches for disappearing tracks, and find that the LHC presently excludes a real triplet scalar lighter than 248 (275) GeV, for a mass splitting of 172 (160) MeV with ℒ = 36 fb−1. The reach can extend to 497 (520) GeV with the collection of 3000 fb−1. We extrapolate the 13 TeV analysis to a prospective 100 TeV pp collider, and find that a ∼ 3 TeV triplet scalar could be discoverable with ℒ = 30 ab−1, depending on the degree to which pile up effects are under control. We also investigate the dark matter candidate in our model and corresponding present and prospective constraints from dark matter direct detection. We find that currently XENON1T can exclude a real triplet dark matter lighter than ∼ 3 TeV for a Higgs portal coupling of order one or larger, and the future XENON20T will cover almost the entire dark matter viable parameter space except for vanishingly small portal coupling.

scholarly journals Fermion singlet dark matter in a pseudoscalar dark matter portal

2021 ◽  
Vol 2021 (10) ◽  
Author(s):  
Bastián Díaz Sáez ◽  
Patricio Escalona ◽  
Sebastián Norero ◽  
Alfonso Zerwekh
Keyword(s):  
Dark Matter ◽  
Parameter Space ◽  
Indirect Detection ◽  
Dirac Fermion ◽  
Simple Extension ◽  
Higgs Decay ◽  
The Standard Model ◽  
Matter Model ◽  
Relic Abundance ◽  
Dark Matter Model

Abstract We explore a simple extension to the Standard Model containing two gauge singlets: a Dirac fermion and a real pseudoscalar. In some regions of the parameter space both singlets are stable without the necessity of additional symmetries, then becoming a possible two-component dark matter model. We study the relic abundance production via freeze-out, with the latter determined by annihilations, conversions and semi-annihilations. Experimental constraints from invisible Higgs decay, dark matter relic abundance and direct/indirect detection are studied. We found three viable regions of the parameter space, and the model is sensitive to indirect searches.

scholarly journals Exploring direct detection suppressed regions in a simple 2-scalar mediator model of scalar dark matter

2021 ◽  
Vol 81 (5) ◽  
Author(s):  
Jérôme Claude ◽  
Stephen Godfrey
Keyword(s):  
Dark Matter ◽  
Simple Model ◽  
Standard Model ◽  
Parameter Space ◽  
Cross Sections ◽  
Direct Detection ◽  
Detection Limits ◽  
Interference Effects ◽  
The Standard Model ◽  
Relic Abundance

AbstractWe explore regions of parameter space that give rise to suppressed direct detection cross sections in a simple model of scalar dark matter with a scalar portal that mixes with the standard model Higgs. We found that even this simple model allows considerable room in the parameter space that has not been excluded by direct detection limits. A number of effects leading to this result have been previously noted. Our main new result explores interference effects between different contributions to DM annihilation when the DM mass is larger than the scalar portal mass. New annihilation channels open up and the parameters of the model need to compensate to give the correct DM relic abundance, resulting in smaller direct detection cross sections. We find that even in a very simple model of DM there are still sizeable regions of parameter space that are not ruled out by experiment.

scholarly journals Lepton dark matter portal in the inert Zee model

2020 ◽  
Vol 35 (31) ◽  
pp. 2050190
Author(s):  
Alexandra Gaviria ◽  
Robinson Longas ◽  
Andrés Rivera
Keyword(s):  
Dark Matter ◽  
Parameter Space ◽  
Tree Level ◽  
Neutrino Masses ◽  
Dark Matter Annihilation ◽  
Annihilation Channel ◽  
Flavor Changing ◽  
Inert Doublet Model ◽  
Relic Abundance ◽  
The Impact

The inert Zee model is an extension of the Zee model for neutrino masses. This new model explains the dark matter relic abundance, generates a one-loop neutrino masses and forbids tree-level Higgs-mediated flavor changing neutral currents. Although the dark matter phenomenology of the model is similar to that of the inert doublet model, the presence of new vector-like fermions opens the lepton portal as a new dark matter annihilation channel. We study the impact of this new portal in the low-mass regime and show the parameter space allowed by direct and indirect searches of dark matter. Remarkably, the region for [Formula: see text] GeV is recovered for [Formula: see text]. We also show that future experiments like LZ and DARWIN could probe a large region of the parameter space of the model.

scholarly journals FIMP Dark Matter in Clockwork/Linear Dilaton extra-dimensions

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
Nicolás Bernal ◽  
Andrea Donini ◽  
Miguel G. Folgado ◽  
Nuria Rius
Keyword(s):  
Dark Matter ◽  
Standard Model ◽  
Parameter Space ◽  
Extra Dimensions ◽  
Scalar Fields ◽  
The Standard Model ◽  
Linear Dilaton ◽  
Warped Extra Dimensions ◽  
Relic Abundance ◽  
Significant Region

Abstract We study the possibility that Dark Matter (DM) is made of Feebly Interacting Massive Particles (FIMP) interacting just gravitationally with the Standard Model particles in the framework of a Clockwork/Linear Dilaton (CW/LD) model. We restrict here to the case in which the DM particles are scalar fields. This paper extends our previous study of FIMP’s in Randall-Sundrum (RS) warped extra-dimensions. As it was the case in the RS scenario, also in the CW/LD model we find a significant region of the parameter space in which the observed DM relic abundance can be reproduced with scalar DM mass in the MeV range, with a reheating temperature varying from 10 GeV to 109 GeV. We comment on the similarities of the results in both extra-dimensional models.

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