Neutrino unification

Area of Science:

• Particle Physics
• Cosmology
• Astroparticle Physics

Background:

• Current neutrino data hint at a unified origin for neutrino masses at a high energy scale, termed "neutrino unification" (M(X)).
• Theoretical models explore scenarios where neutrinos are quasidegenerate, with masses in the electron-volt range.

Purpose of the Study:

• To investigate the implications of a common seed for neutrino masses at a unification scale.
• To explore how supersymmetric thresholds influence neutrino mass splittings and oscillation parameters.

Main Methods:

• Analysis of existing neutrino oscillation data.
• Theoretical modeling incorporating renormalization group effects from supersymmetric thresholds.
• Correlation analysis between solar neutrino oscillation parameters and reactor neutrino parameters.

Main Results:

• The theoretical ansatz naturally produces quasidegenerate neutrinos in the electron-volt range.
• Neutrino mass splittings are induced by renormalization effects linked to supersymmetric thresholds.
• The leptonic analog of the Cabibbo angle (theta(middle dot in circle)) for solar neutrino oscillations is predicted to be nearly maximal.
• A correlation is found between the maximal solar mixing and the smallness of the reactor mixing angle (theta(reactor)).
• The two leading mass eigenstates in electron neutrinos form a pseudo-Dirac neutrino, consistent with neutrinoless double beta decay constraints.

Conclusions:

• A simple "neutrino unification" scale naturally explains the observed neutrino properties.
• Supersymmetry plays a crucial role in generating observable neutrino mass differences and mixing angles.
• The model provides a consistent framework for solar neutrino oscillations and avoids experimental constraints from neutrinoless double beta decay.