Collider constraints and prospects of a scalar singlet extension to Higgs portal dark matter

Dupuis, Grace

doi:10.1007/jhep07(2016)008

Cited by 30 publications

(24 citation statements)

References 90 publications

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“…We consider a Majorana fermion dark matter, χ, with a scalar mediator, S, that interacts with SM states through a (small) Higgs portal coupling. A useful simple model is [91] (see also [5,92,93])…”

Section: Higgs Portalmentioning

confidence: 99%

Looking for the WIMP next door

Evans

Gori

Shelton

2018

J. High Energ. Phys.

128

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Abstract:We comprehensively study experimental constraints and prospects for a class of minimal hidden sector dark matter (DM) models, highlighting how the cosmological history of these models informs the experimental signals. We study simple 'secluded' models, where the DM freezes out into unstable dark mediator states, and consider the minimal cosmic history of this dark sector, where coupling of the dark mediator to the SM was sufficient to keep the two sectors in thermal equilibrium at early times. In the well-motivated case where the dark mediators couple to the Standard Model (SM) via renormalizable interactions, the requirement of thermal equilibrium provides a minimal, UV-insensitive, and predictive cosmology for hidden sector dark matter. We call DM that freezes out of a dark radiation bath in thermal equilibrium with the SM a WIMP next door, and demonstrate that the parameter space for such WIMPs next door is sharply defined, bounded, and in large part potentially accessible. This parameter space, and the corresponding signals, depend on the leading interaction between the SM and the dark mediator; we establish it for both Higgs and vector portal interactions. In particular, there is a cosmological lower bound on the portal coupling strength necessary to thermalize the two sectors in the early universe. We determine this thermalization floor as a function of equilibration temperature for the first time. We demonstrate that direct detection experiments are currently probing this cosmological lower bound in some regions of parameter space, while indirect detection signals and terrestrial searches for the mediator cut further into the viable parameter space. We present regions of interest for both direct detection and dark mediator searches, including motivated parameter space for the direct detection of sub-GeV DM.

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Section: Higgs Portalmentioning

confidence: 99%

Looking for the WIMP next door

Evans

Gori

Shelton

2018

J. High Energ. Phys.

128

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“…Extending the scalar sector of the SM has been a popular option to address various beyond SM phenomena such as providing a dark matter candidate [85][86][87]. Therefore, implications on the Higgs sector in the context of a single pure scalar singlet have been explored in a number of works [88][89][90][91][92]. These works have constrained the mixing of the new scalar with the Higgs.…”

Section: Higgs-scalar Mixing Contraintmentioning

confidence: 99%

“…(2.10), we observe that three-body decays of the scalars to scalar and two leptons are possible but they are expected to be subdominant due to phase space suppression. However, for certain points in the model parameter space, p, it is possible that the three-body decays are non-negligible [92] and therefore are included in our Monte-Carlo simulations. The dominant configuration is two scalars in the final state where all possible combinations are generated.…”

Section: • M S I < M Hmentioning

confidence: 99%

Constraining A4 leptonic flavour model parameters at colliders and beyond

Heinrich

Schulz

Turner

et al. 2019

J. High Energ. Phys.

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The observed pattern of mixing in the neutrino sector may be explained by the presence of a non-Abelian, discrete flavour symmetry broken into residual subgroups at low energies. Many flavour models require the presence of Standard Model singlet scalars which can promptly decay to charged leptons in a flavour-violating manner. We constrain the model parameters of a generic A 4 leptonic flavour model using a synergy of experimental data including limits from charged lepton flavour conversion, an 8 TeV collider analysis and constraints from the anomalous magnetic moment of the muon. The most powerful constraints derive from the MEG collaborations' limit on Br(µ → eγ) and the reinterpretation of an 8 TeV Atlas search for anomalous productions of multi-leptonic final states. We quantify the exclusionary power of each of these experiments and identify regions where the constraints from collider and MEG experimental data are complementary.

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“…While right-handed neutrinos are difficult to detect in direct searches at the LHC [15], scalar fields show better prospects to be detected and are being thoroughly searched for [16][17][18][19]. No clear signal of a heavy scalar particle has yet been found, unless one counts the recent diphoton excess [20] and the statistical signal with three sigma significance reported in ref.…”

Section: Introductionmentioning

confidence: 99%

Clues on the Majorana scale from scalar resonances at the LHC

Fischer

2017

Mod. Phys. Lett. A

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In order to address the observation of the neutrino oscillations and the metastability of the Standard Model, we extend the fermion sector with two right-handed (i.e. sterile) neutrinos, and the scalar sector of the SM with a real scalar, the Hill field. The latter takes the rôle of a Majoron and generates the Majorana masses for the neutrino sector, such that the particle spectrum features two CP-even scalars h 1 and h 2 , and also two heavy, mass degenerate neutrinos. When the h 1 is identified with the scalar resonance at ∼125 GeV and the condition is imposed that the h 1 self coupling and its running vanish at the Planck scale, the scalar mixing and the vacuum expectation value of the Hill field are fixed by the h 2 mass.The h 2 can be searched for at the LHC, and it has prospects of being discovered for the target integrated luminosities of the HL-LHC and the Future Circular hadron Collider (FCC-hh) when its mass is on the weak scale. The knowledge of the h 2 mass and its decay properties can yield an insight into its coupling to the heavy neutrinos, and thus also on the heavy neutrino mass scale. This yields an interesting connection between potentially detectable heavy scalars in high-energy proton collisions and the mass scale of the heavy neutrinos that is testable at the LHC and at future colliders.

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Collider constraints and prospects of a scalar singlet extension to Higgs portal dark matter

Cited by 30 publications

References 90 publications

Looking for the WIMP next door

Looking for the WIMP next door

Constraining A4 leptonic flavour model parameters at colliders and beyond

Clues on the Majorana scale from scalar resonances at the LHC

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