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Singlet-Doublet Majorana Dark Matter and Neutrino Mass in a minimal Type-I Seesaw Scenario
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abstract
In a bid to simultaneous explanation of dark matter (DM) and tiny but non-zero masses of left-handed neutrinos, we propose a minimal extension of the Standard Model (SM) by a vector-like fermion doublet and three right handed (RH) singlet neutrinos. The DM arises as a mixture of the neutral component of the fermion doublet and one of the RH neutrinos, both assumed to be odd under an additional $\mathcal{Z}_2$ symmetry. As a result, the DM emerges to be a dominantly Majorana particle and escapes from $Z$-mediated direct search constraints to mark a significant difference from singlet-doublet Dirac DM. The other two $\mathcal{Z}_2$ even heavy RH neutrinos give rise masses and mixing of light neutrinos via Type-I Seesaw mechanism. The particle content automatically allows us to extend the model by a gauged $U(1)_{B-L}$ symmetry, which is anomaly free and brings an additional portal between DM and SM particles. Relic density and direct search allowed parameter space for both the cases are investigated through detailed numerical scan, while collider search strategies are also indicated.
Forward citations
Cited by 4 Pith papers
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Singlet-Doublet fermion origin of dark matter, neutrino mass and inverse first-order electroweak phase transition
New singlet and doublet fermions, a scalar singlet, and right-handed neutrinos can simultaneously explain Dirac neutrino masses, dark matter, and a two-step inverse electroweak phase transition with observable gravita...
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Gravitational Wave Probe of Singlet-Doublet Dark Matter Induced Radiative Neutrino Mass
A radiative-seesaw model with singlet-doublet dark matter can satisfy neutrino, muon, flavor, relic, and direct-detection constraints while producing a first-order electroweak phase transition with gravitational waves...
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Effective theory of light Dirac neutrino portal dark matter with observable ${\Delta N_{\rm eff}}$
A dark matter candidate interacting only with right-handed neutrinos is shown to produce ΔNeff ≥ 0.21, testable by future CMB experiments.
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Impact of conversion-driven processes on singlet-doublet Majorana dark matter relic
For Majorana singlet-doublet dark matter, including conversion-driven processes enlarges the relic-density- and direct-detection-allowed mixing range to sinθ≈2×10^-7–0.16 for M_DM up to ~1750 GeV.
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