Sterile Neutrino Dark Matter and Low Scale Leptogenesis from a Charged Scalar

Abstract

We show that novel paths to dark matter generation and baryogenesis are open when the Standard Model is extended with three sterile neutrinos $N_i$ and a charged scalar ${\delta }^{+}$. Specifically, we propose a new production mechanism for the dark matter particle --a multi-keV sterile neutrino, $N_1$-- that does not depend on the active-sterile mixing angle and does not rely on a large primordial lepton asymmetry. Instead, $N_1$ is produced, via freeze-in, by the decays of ${\delta }^{+}$ while it is in equilibrium in the early Universe. In addition, we demonstrate that, thanks to the couplings between the heavier sterile neutrinos $N_{2,3}$ and ${\delta }^{+}$, baryogenesis via leptogenesis can be realized close to the electroweak scale. The lepton asymmetry is generated either by $N_{2,3}$-decays for masses $M_{2,3}\gtrsim$ TeV, or by $N_{2,3}$-oscillations for $M_{2,3}\sim$ GeV. Experimental signatures of this scenario include an X-ray line from dark matter decays, and the direct production of ${\delta }^{+}$ at the LHC. This model thus describes a minimal, testable scenario for neutrino masses, the baryon asymmetry, and dark matter.

15 pages v2: minor clarifications and additional references

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Cited by in corpus (16)

• The Dawn of FIMP Dark Matter: A Review of Models and Constraints
• The Present and Future Status of Heavy Neutral Leptons
• New Constraints on Sterile Neutrino Dark Matter from $NuSTAR$ M31 Observations
• keV Sterile Neutrino Dark Matter from Singlet Scalar Decays: Basic Concepts and Subtle Features
• keV Sterile Neutrino Dark Matter from Singlet Scalar Decays: The Most General Case
• Freeze-in Production of Sterile Neutrino Dark Matter in U(1)${}_{\mathrm{B}-\mathrm{L}}$ Model
• Searches for Long-Lived Particles at the Future FCC-ee
• New Constraints on the Mass of Fermionic Dark Matter from Dwarf Spheroidal Galaxies
• Neutrino dark matter and the Higgs portal: improved freeze-in analysis
• Naturally small Yukawa couplings from trans-Planckian asymptotic safety
• Non-abelian Dark Matter Solutions for Galactic Gamma-ray Excess and Perseus 3.5 keV X-ray Line
• Constraints on $Z^{\prime }$ solutions to the flavor anomalies with trans-Planckian asymptotic safety
• Roles of sterile neutrinos in particle physics and cosmology
• Freeze-in and freeze-out of sterile neutrino dark matter
• A closer look at the seesaw-dark matter correspondence
• Mini-review on baryogenesis at the TeV scale and possible connections with dark matter