# Quasi-Dirac neutrino oscillations at DUNE and JUNO

## TL;DR

This paper investigates how quasi-Dirac neutrinos, which include small Majorana mass terms, affect neutrino oscillations and assesses the potential of DUNE and JUNO experiments to detect or constrain these effects.

## Contribution

The study provides a sensitivity analysis of DUNE and JUNO to quasi-Dirac neutrino parameters, highlighting their potential to improve bounds and discover such neutrinos.

## Key findings

- DUNE and JUNO can significantly tighten bounds on quasi-Dirac parameters.
- The experiments have potential to discover quasi-Dirac neutrinos if they exist.
- New mixing angles and phases influence oscillation probabilities.

## Abstract

Quasi-Dirac neutrinos are obtained when the Lagrangian density of a neutrino mass model contains both Dirac and Majorana mass terms, and the Majorana terms are sufficiently small. This type of neutrinos introduces new mixing angles and mass splittings into the Hamiltonian, which will modify the standard neutrino oscillation probabilities. In this paper, we focus on the case where the new mass splittings are too small to be measured, but new angles and phases are present. We perform a sensitivity study for this scenario for the upcoming experiments DUNE and JUNO, finding that they will improve current bounds on the relevant parameters. Finally, we also explore the discovery potential of both experiments, assuming that neutrinos are indeed quasi-Dirac particles.