# New mixing schemes for (3+1) neutrinos

## TL;DR

This paper introduces new (3+1) neutrino mixing schemes that incorporate active and sterile neutrino mixing, featuring a structured matrix with perturbations to explain observed neutrino phenomena and correlations among mixing angles.

## Contribution

It proposes novel mixing schemes with a factorized matrix structure, linking flavor symmetry with small perturbations to account for experimental neutrino data.

## Key findings

- New mixing schemes with structured matrices
- Correlations among neutrino mixing angles identified
- Parameter space for neutrino mixing parameters calculated

## Abstract

We propose new mixing schemes for (3+1) neutrinos which describe mixing among active-active and active-sterile neutrinos. The mixing matrix in these mixing schemes can be factored into a zeroth order flavor symmetric part and another part representing small perturbations needed for generating non-zero $U_{e3}$, nonmaximal $\theta_{23}$, CP violation and active-sterile mixing. We find interesting correlations amongst various neutrino mixing angles and, also, calculate the parameter space for various parameters.