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Two-loop radiative seesaw with multicomponent dark matter explaining the possible gamma excess in the Higgs boson decay and at the Fermi LAT

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arxiv 1302.3936 v2 pith:54TSTHPX submitted 2013-02-16 hep-ph astro-ph.HE

Mayumi Aoki , Jisuke Kubo , Hiroshi Takano This is my paper · ORCID
classification hep-phastro-ph.HE
keywords gammabosondarkhiggsmattermodelradiativescalar
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A non-supersymmetric model of a two-loop radiative seesaw is proposed. The model contains, in addition to the standard model (SM) Higgs boson, an inert SU(2)_L doublet scalar eta and two inert singlet scalars phi and chi. The lepton number is softly broken by a dimension-two operator, and the tree-level Dirac mass is forbidden by Z_2 x Z_2' (or D_{2N}), which predicts the existence of two or three dark matter particles. The scalar sector is minimal; none of the scalar fields can be suppressed for the radiative seesaw mechanism to work. There are by-products: The SM Higgs boson decay into two gamma's is slightly enhanced by eta^+ (the charged component of eta) circulating in one-loop diagrams for h to gamma gamma. The 135 GeV gamma-ray line observed at the Fermi LAT can be also explained by the annihilation of chi dark matter. We employ a mechanism of temperature-dependent annihilation cross section to suppress the continuum gamma rays and the production of antiprotons. The explanation can survive even down to the XENON1T sensitivity limit.

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Cited by 2 Pith papers

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  1. Two-component Dark Matter and low scale Thermal Leptogenesis

    hep-ph 2024-12 conditional novelty 6.0 of 10

    A two-component dark matter extension of the scotogenic model in which both dark matter particles participate in the CP violation that generates the observed baryon asymmetry at the TeV scale.

  2. Prospecting bipartite Dark Matter through Gravitational Waves

    hep-ph 2024-12 conditional novelty 6.0 of 10

    A two-component dark matter model with an inert triplet scalar and a singlet fermion can explain the relic abundance while producing a strong electroweak phase transition and gravitational wave signals detectable by L...

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