# Low scale type I seesaw model for lepton masses and mixings

## TL;DR

This paper introduces a novel low scale type I seesaw model that explains neutrino masses with minimal particle content and predicts neutrino observables using only four parameters, operating at energies around 50 GeV.

## Contribution

It proposes an alternative low scale seesaw model based on spontaneous symmetry breaking, avoiding linear or inverse mechanisms, with minimal particles and high predictive power.

## Key findings

- Right-handed neutrinos can have masses around 50 GeV.
- Model successfully reproduces all six low energy neutrino observables.
- Uses only four effective parameters for neutrino sector predictions.

## Abstract

In contrast to the original type I seesaw mechanism that requires right-handed Majorana neutrinos at energies much higher than the electroweak scale, the so-called low scale seesaw models allow lighter masses for the additional neutrinos. Here we propose an alternative low scale type I seesaw model, where neither linear nor inverse seesaw mechanisms take place, but the spontaneous breaking of a discrete symmetry at an energy scale much lower than the model cutoff is responsible for the smallness of the light active neutrino masses. In this scenario, the model is defined with minimal particle content, where the right-handed Majorana neutrinos can have masses at the $\sim 50\mbox{ GeV}$ scale. The model is predictive in the neutrino sector having only four effective parameters that allow to successfully reproduce the experimental values of the six low energy neutrino observables.