Completing RHINO

Abstract

The right-handed (RH) Higgs-induced neutrino mixing (RHINO) model explains neutrino masses and origin of matter in the universe within a unified picture. The mixing, effectively described by a dimension five operator, is responsible both for the production of dark neutrinos, converting a small fraction of seesaw neutrinos acting as source, and for their decays. We show that including the production of source neutrinos from Higgs portal interactions, their abundance can thermalise prior to the onset of source-dark neutrino oscillations, resulting into an enhanced production of dark neutrinos that thus can play the role of decaying dark matter (DM) for a much higher seesaw scale. This can be above the sphaleron freeze-out temperature and as high as $\sim 100\mathrm{TeV}$, so that strong thermal resonant leptogenesis for the generation of the matter-antimatter asymmetry is viable. We obtain a $\sim 1\mathrm{TeV}$--$1\mathrm{PeV}$ allowed dark neutrino mass range. Intriguingly, their decays can also explain a neutrino flux excess at $\mathcal{O}(100\mathrm{TeV})$ energies recently confirmed by the IceCube collaboration analysing 7.5yr HESE data. Our results also point to an effective scale for Higgs portal interactions nicely identifiable with the grandunified scale and many orders of magnitude below the effective scale for the mixing. We explain this hierarchy in a UV-complete model with a very heavy fermion as mediator: the first scale corresponds to the fundamental scale of new physics, while the second is much higher because of a very small coupling identifiable with a symmetry breaking parameter. Therefore, RHINO realises a simple unified model of neutrino masses and origin of matter in the universe currently under scrutiny at neutrino telescopes and potentially embeddable within a grandunified model.

arXiv comment29 pages, 10 figures; v2 matching version to appear in JHEP

References in corpus (31)

• Sterile Neutrinos as Dark Matter
• The $\nu$MSM, Dark Matter and Baryon Asymmetry of the Universe
• A lower bound on the right-handed neutrino mass from leptogenesis
• Resonant Leptogenesis
• A New Dark Matter Candidate: Non-thermal Sterile Neutrinos
• CP Violation and Baryogenesis due to Heavy Majorana Neutrinos
• Baryogenesis via neutrino oscillations
• Big-Bang Nucleosynthesis and Gravitino
• The Sphaleron Rate in the Minimal Standard Model
• Nonthermal Supermassive Dark Matter
• Sterile Neutrinos as the Origin of Dark and Baryonic Matter
• Big-Bang Nucleosynthesis with Unstable Gravitino and Upper Bound on the Reheating Temperature
• Resonantly-Produced 7 keV Sterile Neutrino Dark Matter Models and the Properties of Milky Way Satellites
• Superheavy dark matter through Higgs portal operators
• Cosmic Neutrinos from Unstable Relic Particles
• New aspects of leptogenesis bounds
• Mapping the viable parameter space for testable leptogenesis
• Non-unitary Leptonic Mixing and Leptogenesis
• Unifying leptogenesis, dark matter and high-energy neutrinos with right-handed neutrino mixing via Higgs portal
• Cold Dark Matter from heavy Right-Handed neutrino mixing
• Leptogenesis from Low Energy $CP$ Violation
• Update on decaying and annihilating heavy dark matter with the 6-year IceCube HESE data
• Sterile neutrino dark matter via coinciding resonances
• Decaying dark matter at IceCube and its signature on High Energy gamma experiments
• On the origin of matter in the Universe
• Constraints on heavy decaying dark matter with current gamma-ray measurements
• Flavoured Resonant Leptogenesis at Sub-TeV Scales
• Neutrinophilic Dark Matter in the epoch of IceCube and Fermi-LAT
• Density matrix calculation of the dark matter abundance in the Higgs induced right-handed neutrino mixing model
• Majorana Dark Matter
• Gravitational waves from first-order phase transitions in Majoron models of neutrino mass