Screening of Dirac flavor structure in the seesaw and neutrino mixing

Abstract

We consider the mechanism of screening of the Dirac flavor structure in the context of the double seesaw mechanism. As a consequence of screening, the structure of the light neutrino mass matrix, m_ν, is determined essentially by the structure of the (Majorana) mass matrix, M_S, of new super-heavy (Planck scale) neutral fermions S. We calculate effects of the renormalization group running in order to investigate the stability of the screening mechanism with respect to radiative corrections. We find that screening is stable in the supersymmetric case, whereas in the standard model it is unstable for certain structures of M_S. The screening mechanism allows us to reconcile the (approximate) quark-lepton symmetry and the strong difference of the mixing patterns in the quark and lepton sectors. It opens new possibilities to explain a quasi-degenerate neutrino mass spectrum, special ``neutrino'' symmetries and quark-lepton complementarity. Screening can emerge from certain flavor symmetries or Grand Unification.

arXiv comment27 pages, 3 figures; references added, discussion of the E6 model modified

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• Predicting neutrino parameters from SO(3) family symmetry and quark-lepton unification
• Revisiting Bimaximal Neutrino Mixing in a Model with S4 Discrete Symmetry
• Charged Lepton Corrections to Neutrino Mixing Angles and CP Phases Revisited
• Discrete Flavour Groups, θ_13 and Lepton Flavour Violation
• Lepton Mixing and Cancellation of the Dirac Mass Hierarchy in SO(10) GUTs with Flavor Symmetries T7 and Sigma(81)
• The Interplay Between GUT and Flavour Symmetries in a Pati-Salam x S4 Model
• Tri-Bimaximal Neutrino Mixing and Discrete Flavour Symmetries
• Phenomenological Consequences of sub-leading Terms in See-Saw Formulas
• Quark lepton complementarity and renormalization group effects
• An SO(10)XS4 Model of Quark-Lepton Complementarity
• Extended double seesaw model for neutrino mass spectrum and low scale leptogenesis
• Grand unification of $\mu -\tau$ Symmetry
• Neutrino Mass and New Physics
• Discrete Flavor Symmetry, Dynamical Mass Textures, and Grand Unification
• Repressing Anarchy in Neutrino Mass Textures
• Quark and lepton mixing angles with a dodeca-symmetry
• Running Effects on Lepton Mixing Angles in Flavour Models with Type I Seesaw
• Tri-bi-maximal mixing in viable family symmetry unified model with extended seesaw
• Inverse Seesaw Mechanism in Nonsupersymmetric SO(10), Proton Lifetime, Nonunitarity Effects, and a Low-mass Z' Boson
• An $A_4$ realization of inverse seesaw: neutrino masses, ${\theta }_{13}$ and leptonic non-unitarity
• Quantum numbers of heavy neutrinos, tri-bi-maximal mixing through double seesaw with permutation symmetry, and comment on ${\theta }_{\mathrm{sol}}+{\theta }_c\simeq \frac{\pi }{4}$
• Neutrino mass and low-scale leptogenesis in a testable SUSY SO(10) model
• Inverse see-saw, leptogenesis, observable proton decay and ${\Delta }_{\mathrm{R}}^{\pm \pm }$ in SUSY SO(10) with heavy W_R
• Low Scale Left-Right Symmetry and Naturally Small Neutrino Mass
• Type I seesaw mechanism for quasi degenerate neutrinos
• Standard Coupling Unification in SO(10), Hybrid Seesaw Neutrino Mass and Leptogenesis, Dark Matter, and Proton Lifetime Predictions
• Minimal archi-texture for neutrino mass matrices
• Neutrino mixing in SO(10) GUTs with non-abelian flavor symmetry in the hidden sector
• Neutrinoless double beta decay in Left-Right symmetric model with double seesaw mechanism
• Renormalisation Group Corrections to the Littlest Seesaw Model and Maximal Atmospheric Mixing
• New mechanism for Type-II seesaw dominance in SO(10) with low-mass Z-prime, RH neutrinos, and verifiable LFV, LNV, and proton decay
• Lepton mixing from the hidden sector
• Leptogenesis in a Left-Right Symmetric Model with double seesaw
• Quasi-degenerate neutrinos in SO(10)
• Renormalization Group Running of Lepton Mixing Parameters in See-Saw Models with $S_4$ Flavor Symmetry
• Neutrino masses and mixing
• Running of neutrino mass parameters in the Zee model