Leptogenesis in the two right-handed neutrino model revisited

Abstract

We revisit leptogenesis in the minimal non-supersymmetric type I see-saw mechanism with two right-handed (RH) neutrinos, including flavour effects and allowing both RH neutrinos N_1 and N_2 to contribute, rather than just the lightest RH neutrino N_1 that has hitherto been considered. By performing scans over parameter space in terms of the single complex angle z of the orthogonal matrix R, for a range of PMNS parameters, we find that in regions around z \sim \pm π/2, for the case of a normal mass hierarchy, the N_2 contribution can dominate the contribution to leptogenesis, allowing the lightest RH neutrino mass to be decreased by about an order of magnitude in these regions, down to M_1 \sim 1.3*10^11 GeV for vanishing initial N_2-abundance, with the numerical results supported by analytic estimates. We show that the regions around z \sim \pm π/2 correspond to light sequential dominance, so the new results in this paper may be relevant to unified model building.

41 pages, 10 figures; v2 matches published version in PRD

References in corpus (19)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Indication of Electron Neutrino Appearance from an Accelerator-produced Off-axis Muon Neutrino Beam
• Phenomenology with Massive Neutrinos
• Flavour Matters in Leptogenesis
• Quantum Leptogenesis I
• Flavoured leptogenesis: a successful thermal leptogenesis with N_1 mass below 10^8 GeV
• Flavoured Leptogenesis in the CTP Formalism
• Flavour-Dependent Leptogenesis with Sequential Dominance
• Quantum Boltzmann Equations and Leptogenesis
• The importance of N2 leptogenesis
• New aspects of leptogenesis bounds
• Full Boltzmann equations for leptogenesis including scattering
• Right unitarity triangles and tri-bimaximal mixing from discrete symmetries and unification
• Successful type I Leptogenesis with SO(10)-inspired mass relations
• Testing SO(10)-inspired leptogenesis with low energy neutrino experiments
• Viability of Dirac phase leptogenesis
• Measurable Neutrino Mass Scale in A4 x SU(5)
• Invariant see-saw models and sequential dominance
• Vacuum misalignment corrections to tri-bimaximal mixing and form dominance

Cited by in corpus (56)

• A White Paper on keV Sterile Neutrino Dark Matter
• Trimaximal mixing with predicted θ_13 from a new type of constrained sequential dominance
• Towards a complete $A_4\times SU(5)$ SUSY GUT
• The minimal scenario of leptogenesis
• Three-Flavoured Non-Resonant Leptogenesis at Intermediate Scales
• Unifying leptogenesis, dark matter and high-energy neutrinos with right-handed neutrino mixing via Higgs portal
• Systematic approach to thermal leptogenesis
• The Dark Side of the Littlest Seesaw: freeze-in, the two right-handed neutrino portal and leptogenesis-friendly fimpzillas
• The minimal seesaw and leptogenesis models
• Leptogenesis from Low Energy $CP$ Violation
• Minimal Seesaw extension for Neutrino Mass and Mixing, Leptogenesis and Dark Matter: FIMPzillas through the Right-Handed Neutrino Portal
• Leptogenesis and fermion mass fit in a renormalizable $SO(10)$ model
• Successful $N_2$ leptogenesis with flavour coupling effects in realistic unified models
• Minimal Two-component Scalar Doublet Dark Matter with Radiative Neutrino Mass
• The minimal type-I seesaw model with maximally-restricted texture zeros
• Mu-tau symmetry and the Littlest Seesaw
• On the origin of matter in the Universe
• SO(10)-inspired solution to the problem of the initial conditions in leptogenesis
• Multicomponent dark matter in extended $U(1{)}_{B-L}$: neutrino mass and high scale validity
• Assessing Perturbativity and Vacuum Stability in High-Scale Leptogenesis
• Fitting high-energy Littlest Seesaw parameters using low-energy neutrino data and leptogenesis
• Implications of residual CP symmetry for leptogenesis in a model with two right-handed neutrinos
• Littlest Inverse Seesaw Model
• Mu-tau reflection symmetry with a high scale texture-zero
• Strong thermal leptogenesis and the absolute neutrino mass scale
• CP violation in neutral lepton transition dipole moment
• Cosmic string gravitational waves from global $U(1{)}_{B-L}$ symmetry breaking as a probe of the type I seesaw scale
• Supersymmetric $SO(10)$-inspired leptogenesis and a new $N_2$-dominated scenario
• Seesaw parametrization for n right-handed neutrinos
• Baryogenesis from Mixing of Lepton Doublets
• Leptogenesis after Chaotic Sneutrino Inflation and the Supersymmetry Breaking Scale
• Consequences of minimal seesaw with complex $\mu \tau$ antisymmetry of neutrinos
• Symmetry origin of Baryon Asymmetry, Dark Matter and Neutrino Mass
• Leptogenesis and Dark Matter from Low Scale Seesaw
• Density matrix calculation of the dark matter abundance in the Higgs induced right-handed neutrino mixing model
• Littlest mu-tau seesaw
• Deviation from Tri-Bimaximal Mixing and Large Reactor Mixing Angle
• Flavoured leptogenesis and ${\mathrm{CP}}^{\mu \tau }$ symmetry
• Renormalisation Group Corrections to the Littlest Seesaw Model and Maximal Atmospheric Mixing
• A Comprehensive Renormalisation Group Analysis of the Littlest Seesaw Model
• Scalar-singlet assisted leptogenesis with CP violation from the vacuum
• Flavour effects in gravitational leptogenesis
• CMB imprints of high scale non-thermal leptogenesis
• New approach to neutrino masses and leptogenesis with Occam's razor
• Generalised Proper Time as a Unifying Basis for Models with Two Right-Handed Neutrinos
• Simiplified textures of the seesaw model for the trimaximal neutrino mixings
• Phenomenology of Baryogenesis from Lepton-Doublet Mixing
• Particular textures of the minimal seesaw model
• Neutrino masses, leptogenesis and dark matter
• Two-component Dark Matter and low scale Thermal Leptogenesis
• Low scale leptogenesis and $T{M}_1$ mixing in neutrinophillic two Higgs doublet model($\nu$2HDM) with S4 flavor symmetry
• Does thermal leptogenesis in a canonical seesaw rely on initial memory?
• Leptogenesis assisted by scalar decays
• Large CP Violation from the Minimum Seesaw Model
• Beyond the Standard Model with leptogenesis and neutrino data
• Freeze-In Dark Matter and Leptogenesis: a ${\psi }^{\prime }$SM route