Deciphering the Seesaw Nature of Neutrino Mass from Unitarity Violation

Abstract

If neutrino masses are obtained via the canonical seesaw mechanism, based on an underlying 2X2 mass matrix, unitarity violation of the neutrino mixing matrix is unavoidable, but its effect is extremely small. On the other hand, in the inverse (and linear) seesaw mechanisms, based on an underlying 3X3 mass matrix, it can be significant and possibly observable. This 3X3 matrix is examined in more detail, and a NEW variation (the lopsided seesaw) is proposed which has features of both mechanisms. A concrete example based on U(1)_N is discussed.

7 pages, no figure, linear and lopsided seesaws discussed

References in corpus (7)

• Non-Standard Neutrino Interactions with Matter from Physics Beyond the Standard Model
• Probing non-unitary mixing and CP-violation at a Neutrino Factory
• Non-unitarity effects in a realistic low-scale seesaw model
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• Scotogenic Inverse Seesaw Model of Neutrino Mass
• Dirac or Inverse Seesaw Neutrino Masses from Gauged B - L Symmetry
• Dirac-Phase Thermal Leptogenesis in the extended Type-I Seesaw Model
• Inverse seesaw in $A_5^{\prime }$ modular symmetry
• Equivalence between massless neutrinos and lepton number conservation in fermionic singlet extensions of the Standard Model
• Inverse Seesaw Neutrino Mass from Lepton Triplets in the U(1)_Sigma Model
• Type III seesaw under $A_4$ modular symmetry with leptogenesis
• Probing Heavy Neutrino Magnetic Moments at the LHC using Long-Lived Particle Searches
• Unitarity violation in sequential neutrino mixing in a model of extra dimensions
• Seesaw Type I and III at the LHeC
• TeV-scale seesaw with non-negligible left-right neutrino mixings
• Probing the Nature of Heavy Neutral Leptons in Direct Searches and Neutrinoless Double Beta Decay
• Seesaw Options for Three Neutrinos
• Low-scale Leptogenesis with Minimal Lepton Flavour Violation
• Mass Reconstruction of Heavy Neutral Leptons from Stopped Mesons
• Utilitarian Supersymmetric Gauge Model of Particle Interactions
• Neutrino mass generation from the perspective of presymmetry
• Asymmetric Higgs Sector and Neutrino Mass in an SU(2)_R Model
• $SU(7)$ Unification of Scotogenic Model with Pati-Salam $SU(4{)}_c\otimes SU(2{)}_L\otimes U(1{)}_R$ gauge symmetry