Bounds on right-handed neutrino parameters from observable leptogenesis

Abstract

We revisit the generation of a matter-antimatter asymmetry in the minimal extension of the Standard Model with two singlet heavy neutral leptons (HNL) that can explain neutrino masses. We derive an accurate analytical approximation to the solution of the complete linearized set of kinetic equations, which exposes the non-trivial parameter dependencies in the form of parameterization-independent CP invariants. The identification of various washout regimes relevant in different regions of parameter space sheds light on the relevance of the mass corrections in the interaction rates and clarifies the correlations of baryogenesis with other observables. In particular, by requiring that the measured baryon asymmetry is reproduced, we derive robust upper or lower bounds on the HNL mixings depending on their masses, and constraints on their flavour structure, as well as on the CP-violating phases of the PMNS mixing matrix, and the amplitude of neutrinoless double-beta decay. We also find certain correlations between low and high scale CP phases. Especially emphasizing the testable part of the parameter space we demonstrate that our findings are in very good agreement with numerical results. The methods developed in this work can help in exploring more complex scenarios.

minor modifications + added appendix; matches published version in JHEP; numerical code made public at https://github.com/stefanmarinus/amiqs

References in corpus (22)

• The fate of hints: updated global analysis of three-flavor neutrino oscillations
• Right-Handed Neutrinos at LHC and the Mechanism of Neutrino Mass Generation
• The Sphaleron Rate in the Minimal Standard Model
• Flavour Matters in Leptogenesis
• Low energy effects of neutrino masses
• Unitarity of the Leptonic Mixing Matrix
• Minimal Flavour Seesaw Models
• Non-unitarity of the leptonic mixing matrix: Present bounds and future sensitivities
• Sterile Neutrinos as the Origin of Dark and Baryonic Matter
• Low Energy Signatures of the TeV Scale See-Saw Mechanism
• Improved BBN constraints on Heavy Neutral Leptons
• Rephasing Invariants of Quark and Lepton Mixing Matrices
• Quasi-Dirac neutrinos at the LHC
• $N_{\mathrm{eff}}$ in low-scale seesaw models versus the lightest neutrino mass
• Uniting low-scale leptogeneses
• Determining the leading-order contact term in neutrinoless double $\mathbf{\beta }$ decay
• Impact of the leading-order short-range nuclear matrix element on the neutrinoless double-beta decay of medium-mass and heavy nuclei
• Distinguishing Dirac/Majorana Sterile Neutrinos at the LHC
• Nearly degenerate heavy sterile neutrinos in cascade decay: mixing and oscillations
• Flavor Invariants and Renormalization-group Equations in the Leptonic Sector with Massive Majorana Neutrinos
• Freeze-out of baryon number in low-scale leptogenesis
• Lattice QCD calculation of light sterile neutrino contribution in $0\nu 2\beta$ decay

Cited by in corpus (18)

• New Benchmark Models for Heavy Neutral Lepton Searches
• HNL mass degeneracy: implications for low-scale seesaws, LNV at colliders and leptogenesis
• Neutrinoless double beta decay rates in the presence of light sterile neutrinos
• Lepton Flavor Asymmetries: from the early Universe to BBN
• Low-Scale Leptogenesis with Low-Energy Dirac CP-Violation
• Extra dimensions with light and heavy neutral leptons: An application to CE$\nu$NS
• Probing the Nature of Heavy Neutral Leptons in Direct Searches and Neutrinoless Double Beta Decay
• Confronting the low-scale seesaw and leptogenesis with neutrinoless double beta decay
• Two portals to GeV sterile neutrinos : dipole versus mixing
• On the collider-testability of the type-I seesaw model with 3 right-handed neutrinos
• Low scale leptogenesis under neutrino $\mu$-$\tau$ reflection symmetry
• New Particles at the Z-Pole: Tera-Z factories as discovery and precision machines
• Insights on the Scale of Leptogenesis from Neutrino Masses and Neutrinoless Double-Beta Decay
• Generalised Casas-Ibarra Parametrisation for Majorana Neutrino Masses
• From oversimplified to overlooked: the case for exploring Rich Dark Sectors
• Search for heavy neutral leptons in B-meson decays
• On different approaches to freeze-in and freeze-out leptogenesis with quasi-degenerate neutrinos
• Impact of dim-6 $\nu$SMEFT operators on low-scale leptogenesis