Quasi-Degenerate Neutrino Masses with Normal and Inverted Hierarchy

Abstract

The effects of CP-phases on the three absolute quasi-degenerate Majorana neutrino (QDN) masses are stud-ied with neutrino mass matrices obeying μ - τ symmetry for normal as well as inverted hierarchical mass patterns. We have made further investigations on 1) the prediction of solar mixing angle which lies below tri-bimaximal mixing value in consistent with neutrino oscillation observational data, 2) the prediction on absolute neutrino mass parameter (mee) in 0νββ decay, and 3) cosmological bound on the sum of the three absolute neutrino masses. The numerical analysis is carried out through the parameterization of neu- trino mass matrices using only two unknown parameters (ε, η) within μ - τ symmetry. The results show the validity of QDN mass models in both normal and inverted hierarchical patterns. These models are far from discrimination and hence not yet ruled out. The results presented in this article are new and have subtle ef- fects in the discrimination of neutrino mass models.

arXiv comment8 pages, gave a contributory Talk at Ist IAS-CERN Singpore, Jan 2012; Journal of Modern Physics (JMP), Vol 2. No.11, November 2011 USA

References in corpus (19)

• Tri-Bimaximal Mixing and the Neutrino Oscillation Data
• Phenomenology with Massive Neutrinos
• Three-flavour neutrino oscillation update
• Mu-Tau Reflection Symmetry in Lepton Mixing and Neutrino Oscillations
• Permutation Symmetry, Tri-Bimaximal Neutrino Mixing and the S3 Group Characters
• Physics at a future Neutrino Factory and super-beam facility
• Global neutrino data and recent reactor fluxes: status of three-flavour oscillation parameters
• Neutrinoless Double Beta Decay and the Solar Neutrino Problem
• Neutrino Masses and Mixings: a Theoretical Perspective
• Degenerate and Quasi Degenerate Majorana Neutrinos
• Majorana Neutrinos, Neutrino Mass Spectrum and the |<m>| ~ 0.001 eV Frontier in Neutrinoless Double Beta Decay
• From Hierarchical to Partially Degenerate Neutrinos via Type II Upgrade of Type I See-Saw Models
• Deviation from tri-bimaximal mixings in two types of inverted hierarchical neutrino mass models
• Type I seesaw mechanism for quasi degenerate neutrinos
• Quasi-degenerate neutrinos and tri-bi-maximal mixing
• Quasi degenerate Neutrino Masses with Universal Strength Yukawa Couplings
• Normal versus inverted hierarchical models within $\mu -\tau$ symmetry
• Quasi-degenerate neutrinos in SO(10)
• Lowering solar mixing angle in inverted hierarchy without charged lepton corrections

Cited by in corpus (4)

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• Validation of a model for Radon-induced background processes in electrostatic spectrometers
• Quasi-degenerate Neutrino mass models and their significance: A model independent investigation
• Bi-Large neutrino mixing with charged lepton correction