A Minimal Model of Majoronic Dark Radiation and Dark Matter

Abstract

We extend the singlet Majoron model of dark radiation by adding another singlet scalar of unit lepton charge. The spontaneous breaking of global $U(1{)}_L$ connects dark radiation with neutrino mass generation via the type-I seesaw mechanism. The model naturally has a stable scalar dark matter field. It also predicts the existence of a light scalar of mass less than 1 GeV that mixes with the Standard Model Higgs boson. We perform a numerical analysis of the parameters of the model by imposing constraints from giving correct relic abundance and satisfying bounds from direct dark matter detection, rare decays of B-meson, and invisible width of the Higgs boson. The viability of the model in accommodating the gamma rays from the Galactic center is discussed as well. The model gives rise to new rare Higgs boson decays such as four-muon final states with displaced vertices. Another unique signal is two muons and missing energy recoil against the muon pair. Our result also shows that such a bridge between dark radiation and the seesaw mechanism will put the seesaw scale in the range of 1-100 TeV.

arXiv comment27 pages,17 figures. To match the published version

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• A Tale of Tails: Dark Matter Interpretations of the Fermi GeV Excess in Light of Background Model Systematics
• WIMPs at the Galactic Center
• Challenges in Explaining the Galactic Center Gamma-Ray Excess with Millisecond Pulsars
• Supernova Constraints on Massive (Pseudo)Scalar Coupling to Neutrinos
• A description of the Galactic Center excess in the Minimal Supersymmetric Standard Model
• The $\text{Fermi}$-LAT gamma-ray excess at the Galactic Center in the singlet-doublet fermion dark matter model
• Confronting Galactic and Extragalactic $\gamma$-ray observed by Fermi-LAT with Annihilating Dark Matter in Inert Higgs Doublet Model
• Signal for a light singlet scalar at the LHC
• Global $U(1{)}_L$ Breaking in Neutrinophilic 2HDM: From LHC Signatures to X-Ray Line
• Electroweak Vacuum Stability and the Seesaw Mechanism Revisited
• Dark Higgs Channel for FERMI GeV $\gamma$-ray Excess
• Renormalization Group Study of the Minimal Majoronic Dark Radiation and Dark Matter Model
• Prospects for Detecting light bosons at the FCC-ee and CEPC
• Interpreting the galactic center gamma-ray excess in the NMSSM
• Inverse Seesaw and Portal Dark Matter
• Study of Gauged Lepton Symmetry Signatures at Colliders
• Alternative Perspective on Gauged Lepton Number and Implications for Collider Physics
• Explaining the AMS positron excess via Right-handed Neutrinos
• Consequences of Neutrinoless Double Decays Dominated by Short Range Interactions