Probing the fermionic Higgs portal at lepton colliders

Fedderke, Michael A.; Lin, Tongyan; Wang, Lian Tao

doi:10.1007/jhep04(2016)160

Cited by 24 publications

(25 citation statements)

References 112 publications

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“…An e + e − collider could probe Higgs portal couplings of order 1, which is far weaker than existing direct detection bounds in the minimal theories that we consider [59]. Such searches could however be important in more complex models [60,119,120], and they could also be significant in models of fermion Higgs portal DM if the additional states added to UV complete the portal operator are relatively light [121][122][123][124].…”

Section: Collider Searchesmentioning

confidence: 99%

Higgs portal dark matter in non-standard cosmological histories

Hardy

2018

J. High Energ. Phys.

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A scalar particle with a relic density set by annihilations through a Higgs portal operator is a simple and minimal possibility for dark matter. However, assuming a thermal cosmological history this model is ruled out over most of parameter space by collider and direct detection constraints. We show that in theories with a non-thermal cosmological history Higgs portal dark matter is viable for a wide range of dark matter masses and values of the portal coupling, evading existing limits. In particular, we focus on the string theory motivated scenario of a period of late time matter domination due to a light modulus with a decay rate that is suppressed by the Planck scale. Dark matter with a mass GeV is possible without additional hidden sector states, and this can have astrophysically relevant self-interactions. We also study the signatures of such models at future direct, indirect, and collider experiments. Searches for invisible Higgs decays at the high luminosity LHC or an e + e − collider could cover a significant proportion of the parameter space for low mass dark matter, and future direct detection experiments will play a complementary role.1 The phenomenology is very similar if the DM is a complex or real scalar, we take it to be real throughout. 2 This is assuming the coupling λ is not very small. If λ is tiny, ∼ 10 −10 , the DM relic abundance could be generated from freeze in [5,6]. 4 There might be a relatively minor inaccuracy in our calculation of the relic abundance for DM masses

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Section: Collider Searchesmentioning

confidence: 99%

Higgs portal dark matter in non-standard cosmological histories

Hardy

2018

J. High Energ. Phys.

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“…Collider searches for virtual effects of dark matter have recently been explored for instance in refs. [8][9][10][11][12].…”

Section: Jhep11(2017)009mentioning

confidence: 99%

“…Detailed analyses of electroweak precision observables at future lepton colliders in the context of fermionic Higgs portals can also be found in refs. [9,36].…”

Section: Jhep11(2017)009mentioning

confidence: 99%

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Virtual signatures of dark sectors in Higgs couplings

Voigt

Westhoff

2017

J. High Energ. Phys.

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Where collider searches for resonant invisible particles lose steam, dark sectors might leave their trace as virtual effects in precision observables. Here we explore this option in the framework of Higgs portal models, where a sector of dark fermions interacts with the standard model through a strong renormalizable coupling to the Higgs boson. We show that precise measurements of Higgs-gauge and triple Higgs interactions can probe dark fermions up to the TeV scale through virtual corrections. Observation prospects at the LHC and future lepton colliders are discussed for the so-called singlet-doublet model of Majorana fermions, a generalization of the bino-higgsino scenario in supersymmetry. We advocate a two-fold search strategy for dark sectors through direct and indirect observables.

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“…Exploiting the physics potential of the CEPC has attracted many interests. Recent works for probing anomalous couplings include studies on the anomalous hhh and htt couplings through the e + e − → Zh measurement [9][10][11][12], the anomalous hZγ and hγγ couplings through the e + e − → hγ measurement [13,14], and the anomalous Zbb coupling [15], and high order effective operators [16,17]. Other CEPC researches about new physics models involve studies on natural supersymmetry [18][19][20], DM models [21][22][23][24][25] and electroweak oblique parameters [16,26,27], and so on [28,29].…”

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confidence: 99%

Exploring fermionic dark matter via Higgs boson precision measurements at the Circular Electron Positron Collider

Xiang

Yin

et al. 2018

Phys. Rev. D

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We study the impact of fermionic dark matter (DM) on projected Higgs precision measurements at the Circular Electron Positron Collider (CEPC), including the one-loop effects on the e þ e − → Zh cross section and the Higgs boson diphoton decay, as well as the tree-level effects on the Higgs boson invisible decay. As illuminating examples, we discuss two UV-complete DM models, whose dark sector contains electroweak multiplets that interact with the Higgs boson via Yukawa couplings. The CEPC sensitivity to these models and current constraints from DM detection and collider experiments are investigated. We find that there exist some parameter regions where the Higgs measurements at the CEPC will be complementary to current DM searches.

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Probing the fermionic Higgs portal at lepton colliders

Cited by 24 publications

References 112 publications

Higgs portal dark matter in non-standard cosmological histories

Higgs portal dark matter in non-standard cosmological histories

Virtual signatures of dark sectors in Higgs couplings

Exploring fermionic dark matter via Higgs boson precision measurements at the Circular Electron Positron Collider

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