A New Littlest Seesaw Model

Abstract

We propose and discuss a new Littlest Seesaw model, realised in the tri-direct CP approach, in which the couplings of the two right-handed neutrinos to the lepton doublets are proportional to $(0,-1,1)$ and $(1,5/2,-1/2)$ respectively with the relative phase $\eta =-\pi /2$. This model can give an excellent description of lepton flavour mixing, including an atmospheric neutrino mixing angle in the second octant, in terms of only two input parameters. We show that the observed baryon asymmetry can be generated for the lightest right-handed neutrino mass $M_1=1.176\times 10^{11}$ GeV in SM and $M_1=3.992\times 10^{10}$ GeV in MSSM with $\tan \beta =5$. We construct an explicit Littlest Seesaw model based on the flavour symmetry $S_4\times Z_4\times Z_9$ in which the desired alignments and the phase $\eta =-\pi /2$ are achieved.

arXiv comment29 pages, 5 figures

References in corpus (63)

• Leptogenesis
• Leptogenesis for Pedestrians
• Towards a complete theory of thermal leptogenesis in the SM and MSSM
• Neutrino Mass and Mixing with Discrete Symmetry
• CP violating decays in leptogenesis scenarios
• Global analysis of three-flavour neutrino oscillations: synergies and tensions in the determination of theta_23, delta_CP, and the mass ordering
• Lepton-Flavor Violation via Right-Handed Neutrino Yukawa Couplings in Supersymmetric Standard Model
• Tri-Bimaximal Neutrino Mixing, A4 and the Modular Symmetry
• Leptogenesis as the origin of matter
• The importance of flavor in leptogenesis
• Flavour Issues in Leptogenesis
• Cosmological Sign of Neutrino CP Violation
• Flavour Matters in Leptogenesis
• Large Mixing Angle MSW and Atmospheric Neutrinos from Single Right-Handed Neutrino Dominance and U(1) Family Symmetry
• Measurement of $J/\psi$ helicity distributions in inelastic photoproduction at HERA
• Predicting neutrino parameters from SO(3) family symmetry and quark-lepton unification
• Atmospheric and Solar Neutrinos with a Heavy Singlet
• Constructing the large mixing angle MNS matrix in see-saw models with right-handed neutrino dominance
• CP and Discrete Flavour Symmetries
• Atmospheric and Solar Neutrinos from Single Right-Handed Neutrino Dominance and U(1) Family Symmetry
• Modular $S_4$ and $A_4$ Symmetries and Their Fixed Points: New Predictive Examples of Lepton Mixing
• Trimaximal mixing with predicted θ_13 from a new type of constrained sequential dominance
• Spontaneous CP violation from vacuum alignment in $S_4$ models of leptons
• Neutrino Masses, Lepton Flavor Mixing and Leptogenesis in the Minimal Seesaw Model
• Generalised CP and $A_4$ Family Symmetry
• Flavour-Dependent Leptogenesis with Sequential Dominance
• Lepton mixing from the interplay of the alternating group A5 and CP
• Mixing angle and phase correlations from A5 with generalised CP and their prospects for discovery
• Generalised CP and Trimaximal TM${}_1$ Lepton Mixing in $S_4$ Family Symmetry
• Generalised CP and $\Delta (6n^2)$ Family Symmetry in Semi-Direct Models of Leptons
• Seesaw Mechanism with Occam's Razor
• Lepton Mixing Parameters from $\Delta (48)$ Family Symmetry and Generalised CP
• Generalized $\mu -\tau$ reflection symmetry and leptonic CP violation
• Minimal see-saw model predicting best fit lepton mixing angles
• Generalised CP and $\Delta (96)$ Family Symmetry
• Predicting Lepton Flavor Mixing from $\Delta (48)$ and Generalized CP Symmetries
• Littlest Seesaw
• A model of quark and lepton mixing
• Leptogenesis and residual CP symmetry
• Flavor and CP symmetries for leptogenesis and 0nubb decay
• Lepton Flavor Mixing and CP Symmetry
• A Bottom-Up Approach to Lepton Flavor and CP Symmetries
• Deviation from Bimaximal Mixing and Leptonic CP Phases in $S_4$ Family Symmetry and Generalized CP
• Neutrino Mixing from CP Symmetry
• $A_4$ and CP symmetry and a model with maximal CP violation
• Precision neutrino experiments vs the Littlest Seesaw
• CP Symmetry and Lepton Mixing from a Scan of Finite Discrete Groups
• Alternative Schemes of Predicting Lepton Mixing Parameters from Discrete Flavor and CP Symmetry
• Generalized CP and $\Delta (3n^2)$ Family Symmetry for Semi-Direct Predictions of the PMNS Matrix
• Invariant approach to CP in family symmetry models
• Quark and Lepton Mixing Patterns from a Common Discrete Flavor Symmetry with Generalized CP
• Invariant approach to CP in unbroken $\Delta (27)$
• Lepton Mixing Predictions from Infinite Group Series $D_{9n,3n}^{(1)}$ with Generalized CP
• Lepton Mixing in $A_5$ Family Symmetry and Generalized CP
• 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
• Toward a unified interpretation of quark and lepton mixing from flavor and CP symmetries
• Lepton Sector Phases and Their Roles in Flavor and Generalized CP Symmetries
• Lepton Mixing Predictions from $S_4$ in the Tri-Direct CP approach to Two Right-handed Neutrino Models
• Neutrino Predictions from Generalized CP Symmetries of Charged Leptons
• Tri-Direct CP in the Littlest Seesaw Playground
• Golden Littlest Seesaw
• Predictions for the Dirac CP-Violating Phase from Sum Rules

Cited by in corpus (10)

• Modular $S_4\times SU(5)$ GUT
• The symmetry approach to quark and lepton masses and mixing
• Littlest Modular Seesaw
• Multiscalar $B-L$ extension based on $S_4$ flavor symmetry for neutrino mass and mixing
• Neutrino mixing sum rules and the Littlest Seesaw
• Phenomenology of extended multiHiggs doublet models with $S_4$ family symmetry
• Simiplified textures of the seesaw model for the trimaximal neutrino mixings
• Phenomenological aspects of the fermion and scalar sectors of a $S_4$ flavored 3-3-1 model
• Orbifold Modular GUT of Flavour
• Resonant leptogenesis and TM${}_1$ mixing in minimal Type-I seesaw model with S${}_4$ symmetry