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Majorana Dark Matter and Neutrino mass in a singlet-doublet extension of the Standard Model

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arxiv 2106.13857 v1 pith:6ENJZVDZ submitted 2021-06-25 hep-ph

Manoranjan Dutta (1) , Subhaditya Bhattacharya (2) , Purusottam Ghosh (3) , Narendra Sahu (1) ((1) Indian Institute of Technology Hyderabad , (2) Indian Institute of Technology Guwahati (3) Harish-Chandra Research Institute , Allahabad) This is my paper · ORCID
classification hep-ph
keywords neutrinosmodeldarkdirectdoubletextensionfermionmajorana
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abstract

A minimal extension of the Standard Model (SM) by a vector-like fermion doublet and three right handed (RH) singlet neutrinos is proposed in order to explain dark matter and tiny neutrino mass simultaneously. 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 imposed $\mathcal{Z}_2$ symmetry. Being Majorana in nature, the DM 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. Relic density and direct search allowed parameter space for the model is investigated through detailed numerical scan.

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  1. Probing Leptophobic Dark Sectors via Gravitational Wave Signatures

    hep-ph 2025-08 unverdicted novelty 4.0 of 10

    A gauged U(1)_B extension of the Standard Model is claimed to produce observable gravitational waves from a first-order phase transition, with dark matter around 8-12 TeV.

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