Neutrino Oscillations in an SO(10) SUSY GUT with U(2)xU(1)$^n$ Family Symmetry

TL;DR

This paper explores various neutrino oscillation solutions within an SO(10) SUSY GUT model with family symmetry, extending previous work to include general symmetry breaking and accommodating more neutrino types and experimental data.

Contribution

It introduces new neutrino solutions in an SO(10) SUSY GUT with family symmetry, including four and five neutrino models fitting diverse experimental results.

Findings

Multiple solutions for solar neutrino oscillations (SMA MSW, LMA MSW, vacuum)

Maximal muon-tau neutrino mixing for atmospheric data

Successful fitting of LSND data with four and five neutrino models

Abstract

In a previous paper we analyzed fermion masses (focusing on neutrino masses and mixing angles) in an SO(10) SUSY GUT with U(2)$\timesU(1)^n$ family symmetry. The model is "natural" containing all operators in the Lagrangian consistent with the states and their charges. With minimal family symmetry breaking vevs the model is also predictive giving a unique solution to atmospheric (with maximal $\nu_\mu \to \nu_\tau$ mixing) and solar (with SMA MSW $\nu_e \to \nu_s$ mixing) neutrino oscillations. In this paper we analyze the case of general family breaking vevs. We now find several new solutions for three, four and five neutrinos. For three neutrinos we now obtain SMA MSW, LMA MSW or vacuum oscillation solutions for solar neutrinos. In all three cases the atmospheric data is described by maximal $\nu_\mu \to \nu_\tau$ mixing. In the four and five neutrino cases, in addition to fitting atmospheric and solar data as before, we are now able to fit LSND data. All this is obtained with the additional parameters coming from the family symmetry breaking vevs; providing only minor changes in the charged fermion fits.