Collider probes of real triplet scalar dark matter

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.

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Gauge-Singlet Vector-Like Fermion Dark Matter, LHC Diphoton Rate, and Direct Detection

Advances in High Energy Physics ◽

10.1155/2017/8689270 ◽

2017 ◽

Vol 2017 ◽

pp. 1-14 ◽

Cited By ~ 2

Author(s):

Shrihari Gopalakrishna ◽

Tuhin Subhra Mukherjee

Keyword(s):

Dark Matter ◽

Direct Detection ◽

Gluon Fusion ◽

Gauge Bosons ◽

Hidden Sector ◽

Dark Matter Relic Density ◽

Higgs Search ◽

Matter Model ◽

Higgs Portal ◽

Dark Matter Model

We study a gauge-singlet vector-like fermion hidden sector dark matter model, in which the communication between the dark matter and the visible standard model sector is via the Higgs-portal scalar-Higgs mixing and also via a hidden sector scalar with loop-level couplings to two gluons and also to two hypercharge gauge bosons induced by a vector-like quark. We find that the Higgs-portal possibility is stringently constrained to be small by the recent LHC di-Higgs search limits, and the loop induced couplings are important to include. In the model parameter space, we present the dark matter relic density, the dark-matter-nucleon direct detection scattering cross section, the LHC diphoton rate from gluon-gluon fusion, and the theoretical upper bounds on the fermion-scalar couplings from perturbative unitarity.

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Searching for Elko dark matter spinors at the CERN LHC

International Journal of Modern Physics A ◽

10.1142/s0217751x15500062 ◽

2015 ◽

Vol 30 (01) ◽

pp. 1550006 ◽

Cited By ~ 19

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.

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Dark Matter Constraints and the Neutralino Sector of the scNMSSM

Universe ◽

10.3390/universe7020031 ◽

2021 ◽

Vol 7 (2) ◽

pp. 31

Author(s):

Elham Aldufeery ◽

Maien Binjonaid

Keyword(s):

Dark Matter ◽

Parameter Space ◽

Cross Sections ◽

Direct Detection ◽

Mass Range ◽

Upper And Lower Bounds ◽

Dark Matter Candidate ◽

Dark Matter Relic Density ◽

Relic Density ◽

Moderate Range

The neutralino sector of the semi-constrained next-to-minimal supersymmetric standard model is explored under recent experimental constraints, with special attention to dark matter (DM) limits. The effects of the upper and lower bounds of dark matter relic density and recent direct detection constraints on spin-independent and -dependent cross-sections are thoroughly analyzed. Particularly, we show which regions of the parameter space are ruled out due to the different dark matter constraints and the corresponding model-specific parameters: λ,κ,Aλ, and Aκ. We analyze all annihilation and co-annihilation processes (with heavier neutralinos and charginos) that contribute to the dark matter relic density. The mass components of the dark matter candidate, the lightest neutralino χ˜10, are studied, and the decays of heavy neutralinos and charginos, especially χ˜20 and χ˜1+, into the lightest neutralino are examined. We impose semi-universal boundary conditions at the Grand Unified Theory scale, and require a moderate range of tanβ≲10. We find that the allowed parameter space is associated with a heavy mass spectrum in general and that the lightest neutralino is mostly Higgsino with a mass range that resides mostly between 1000 and 1500 GeV. However, smaller mass values can be achieved if the DM candidate is bino-like or singlino-like.

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Hybrid anomaly and gravity mediation for electroweak supersymmetry

International Journal of Modern Physics A ◽

10.1142/s0217751x18500355 ◽

2018 ◽

Vol 33 (07) ◽

pp. 1850035

Author(s):

Bin Zhu ◽

Ran Ding ◽

Tianjun Li

Keyword(s):

Dark Matter ◽

Supersymmetry Breaking ◽

Cross Section ◽

Direct Detection ◽

Dark Matter Candidate ◽

Gauge Mediation ◽

Anomaly Mediation ◽

Dark Matter Relic Density ◽

Relic Density ◽

Hybrid Anomaly

In this paper, we propose a hybrid mediation and hybrid supersymmetry breaking. In particular, the RG-invariant anomaly mediation is considered. Together with additional gravity mediation, the slepton tachyon problem of anomaly mediation is solved automatically. The special properties are that all color sparticles masses fall into several TeV regions due to the large [Formula: see text] and [Formula: see text] which are well beyond the scope of current LHC Run II limits. Unlike the gauge mediation, the dark matter candidate is still the lightest neutralino and the correct dark matter relic density can be realized within the framework of mixed axion-Wino dark matter. Due to the existence of multi-component axion-Wino dark matter, the direct detection cross-section is suppressed to evade the tightest LUX, PandaX bound.

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Baryonic Higgs and dark matter

Journal of High Energy Physics ◽

10.1007/jhep02(2021)163 ◽

2021 ◽

Vol 2021 (2) ◽

Author(s):

Pavel Fileviez Pérez ◽

Clara Murgui ◽

Alexis D. Plascencia

Keyword(s):

Dark Matter ◽

Gauge Theory ◽

Gauge Theories ◽

Direct Detection ◽

Hadron Collider ◽

Branching Ratio ◽

Baryon Number ◽

Matter Density ◽

Dark Matter Candidate ◽

Anomaly Cancellation

Abstract We discuss the correlation between dark matter and Higgs decays in gauge theories where the dark matter is predicted from anomaly cancellation. In these theories, the Higgs responsible for the breaking of the gauge symmetry generates the mass for the dark matter candidate. We investigate the Higgs decays in the minimal gauge theory for Baryon number. After imposing the dark matter density and direct detection constraints, we find that the new Higgs can have a large branching ratio into two photons or into dark matter. Furthermore, we discuss the production channels and the unique signatures at the Large Hadron Collider.

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The Search for Electroweakinos

Annual Review of Nuclear and Particle Science ◽

10.1146/annurev-nucl-031020-121031 ◽

2020 ◽

Vol 70 (1) ◽

pp. 425-454

Author(s):

Anadi Canepa ◽

Tao Han ◽

Xing Wang

Keyword(s):

Dark Matter ◽

Cold Dark Matter ◽

Direct Detection ◽

Hadron Collider ◽

Massive Particle ◽

Model Parameters ◽

Dark Matter Candidate ◽

Singlet States ◽

Supersymmetric Theories ◽

Near Future

In this review, we consider a general theoretical framework for fermionic color-singlet states—including a singlet, a doublet, and a triplet under the Standard Model SU(2)L gauge symmetry, corresponding to the bino, higgsino, and wino in supersymmetric theories—generically dubbed electroweakinos for their mass eigenstates. Depending on the relations among these states’ three mass parameters and their mixing after the electroweak symmetry breaking, this sector leads to a rich phenomenology that may be accessible in current and near-future experiments. We discuss the decay patterns of electroweakinos and their observable signatures at colliders, review the existing bounds on the model parameters, and summarize the current statuses of the comprehensive searches by the ATLAS and CMS Collaborations at the Large Hadron Collider. We also comment on the prospects for future colliders. An important feature of the theory is that the lightest neutral electroweakino can be identified as a weakly interacting massive particle cold dark matter candidate. We take into account the existing bounds on the parameters from the dark matter direct detection experiments and discuss the complementarity of the electroweakino searches at colliders.

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Fermionic singlet dark matter in one-loop solutions to the $$R_K$$ anomaly: a systematic study

The European Physical Journal C ◽

10.1140/epjc/s10052-021-09823-0 ◽

2021 ◽

Vol 81 (12) ◽

Author(s):

Mathias Becker ◽

Dominik Döring ◽

Siddhartha Karmakar ◽

Heinrich Päs

Keyword(s):

Dark Matter ◽

Energy Density ◽

Systematic Study ◽

Direct Detection ◽

Dark Matter Candidate ◽

Particle Content ◽

Large Coupling ◽

Dark Matter Relic Density ◽

Relic Density ◽

Matter Energy

AbstractWe study the dark matter phenomenology of Standard Model extensions addressing the reported anomaly in the $$R_K$$ R K observable at one-loop. The article covers the case of fermionic singlet DM coupling leptophilically, quarkphilically or amphiphilically to the SM. The setup utilizes a large coupling of the new particle content to the second lepton generation to explain the $$R_K$$ R K anomaly, which in return tends to diminish the dark matter relic density. Further, dark matter direct detection experiments provide stringent bounds even in cases where the dark matter candidate only contributes a small fraction of the observed dark matter energy density. In fact, direct detection rules out all considered models as an explanation for the $$R_K$$ R K anomaly in the case of Dirac dark matter. Conversely, for Majorana dark matter, the $$R_K$$ R K anomaly can be addressed in agreement with direct detection in coannihilation scenarios. For leptophilic dark matter this region only exists for $$M_\text {DM} \lesssim 1000 \, \mathrm {GeV}$$ M DM ≲ 1000 GeV and dark matter is underabundant. Quarkphilic and amphiphilic scenarios even provide narrow regions of parameter space where the observed relic density can be reproduced while offering an explanation to $$R_K$$ R K in agreement with direct detection experiments.

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Twin Higgs portal dark matter

Journal of High Energy Physics ◽

10.1007/jhep08(2021)009 ◽

2021 ◽

Vol 2021 (8) ◽

Author(s):

David Curtin ◽

Shayne Gryba

Keyword(s):

Dark Matter ◽

Direct Detection ◽

Discrete Symmetry ◽

Scalar Coupling ◽

Minimal Models ◽

Hierarchy Problem ◽

Quartic Interaction ◽

Little Hierarchy Problem ◽

Higgs Portal ◽

Scalar Sector

Abstract Many minimal models of dark matter (DM) or canonical solutions to the hierarchy problem are either excluded or severely constrained by LHC and direct detection null results. In particular, Higgs Portal Dark Matter (HPDM) features a scalar coupling to the Higgs via a quartic interaction, and obtaining the measured relic density via thermal freeze-out gives definite direct detection predictions which are now almost entirely excluded. The Twin Higgs solves the little hierarchy problem without coloured top partners by introducing a twin sector related to the Standard Model (SM) by a discrete symmetry. We generalize HPDM to arbitrary Twin Higgs models and introduce Twin Higgs Portal Dark Matter (THPDM), which features a DM candidate with an SU(4)-invariant quartic coupling to the Twin Higgs scalar sector. Given the size of quadratic corrections to the DM mass, its most motivated scale is near the mass of the radial mode. In that case, DM annihilation proceeds with the full Twin Higgs portal coupling, while direct detection is suppressed by the pNGB nature of the 125 GeV Higgs. For a standard cosmological history, this results in a predicted direct detection signal for THPDM that is orders of magnitude below that of HPDM with very little dependence on the precise details of the twin sector, evading current bounds but predicting possible signals at next generation experiments. In many Twin Higgs models, twin radiation contributions to ∆Neff are suppressed by an asymmetric reheating mechanism. We study this by extending the νMTH and X MTH models to include THPDM and compute the viable parameter space according to the latest CMB bounds. The injected entropy dilutes the DM abundance as well, resulting in additional suppression of direct detection below the neutrino floor.

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Electric dipole moments, new forces and dark matter

Journal of High Energy Physics ◽

10.1007/jhep03(2021)185 ◽

2021 ◽

Vol 2021 (3) ◽

Author(s):

Pavel Fileviez Pérez ◽

Alexis D. Plascencia

Keyword(s):

Dark Matter ◽

Electric Dipole ◽

Dipole Moments ◽

Dark Matter Candidate ◽

Beyond The Standard Model ◽

Electric Dipole Moments ◽

Dark Matter Relic Density ◽

New States ◽

Gauge Anomalies ◽

The Impact

Abstract New sources of CP violation beyond the Standard Model are crucial to explain the baryon asymmetry in the Universe. We discuss the impact of new CP violating interactions in theories where a dark matter candidate is predicted by the cancellation of gauge anomalies. In these theories, the constraint on the dark matter relic density implies an upper bound on the new symmetry breaking scale from which all new states acquire their masses. We investigate in detail the predictions for electric dipole moments and show that if the relevant CP-violating phase is large, experiments such as the ACME collaboration will be able to fully probe the theory.

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Future prospects for the minimal supersymmetric standard model

International Journal of Modern Physics A ◽

10.1142/s0217751x21501888 ◽

2021 ◽

pp. 2150188

Author(s):

Shehu AbdusSalam ◽

Safura S. Barzani ◽

Mohammadreza Noormandipour

Keyword(s):

Dark Matter ◽

Standard Model ◽

Supersymmetric Standard Model ◽

Minimal Supersymmetric Standard Model ◽

Cold Dark Matter ◽

Direct Detection ◽

Hadron Collider ◽

Hadron Colliders ◽

Future Prospects ◽

Lower Limits

Experimental collaborations for the large hadron collider conducted various searches for supersymmetry. In the absence of signals, lower limits were put on sparticle masses but usually within frameworks with (over-)simplifications relative to the entire indications by supersymmetry models. For complementing current interpretations of experimental bounds, we introduce a 30-parameter version of the R-parity conserving Minimal Supersymmetric Standard Model (MSSM-30). Using a sample of the MSSM-30 which are in harmony with cold dark matter, flavor and precision electroweak constraints, we explicitly show the prospects for assessing neutralino candidate dark matter in contrast to future searches for supersymmetry. The MSSM-30-parameter regions that are beyond reach to dark matter direct detection experiments could be probed by future hadron–hadron colliders.

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