Degenerate neutrino mass models revisited

Abstract

A parametrisation of the degenerate neutrino mass matrix obeying $\mu -\tau$ symmetry, is introduced for detailed numerical analysis. As a continuation of our earlier work on normal and inverted hierarchical models, the present parametrisation for degenerate models has the ability to lower the solar mixing angle below the tri-bimaximal value ${\tan }^2{\theta }_{12}=0.5$, while maintaining the condition of maximal atmospheric mixing angle and zero reactor angle. The combined data on the mass-squared differences derived from various oscillation experiments, and also from the bounds on absolute neutrino masses in $0\nu \beta \beta$ decay and cosmology, gives certain constraints on the validity of the degenerate models.

11 pages, 2 figures, 2 tables

References in corpus (2)

• Neutrino Mixing based on Mass Matrices with a $2\leftrightarrow 3$ Symmetry
• Normal versus inverted hierarchical models within $\mu -\tau$ symmetry