# Testability of leptogenesis with three RH-neutrinos below the electroweak scale

## TL;DR

This paper explores the testability of leptogenesis models involving three right-handed neutrinos below the electroweak scale, highlighting experimental prospects at colliders and meson decays.

## Contribution

It demonstrates that models with three low-mass right-handed neutrinos can be tested through current experiments, especially in B meson decays and isotope collisions.

## Key findings

- Large mixing angles are compatible with current constraints.
- GeV-scale right-handed neutrinos can be probed at the LHC.
- Isotope collisions like Ar improve sensitivity over proton collisions.

## Abstract

The Standard Model extended with right-handed neutrinos whose masses are below the electroweak scale provides a simultaneous solution for the origin of neutrino masses and of the baryon asymmetry of the Universe, that can be tested in current experiments. If three right-handed neutrinos participate to the processes, their parameter space of solutions extends to very large mixing angles, saturating the current experimental constraints. Solutions with right-handed neutrino masses at the GeV scale can be probed in the decay of $B$ mesons at the LHC. For this channel the collision of isotopes of intermediate mass such as Ar provides a better sensitivity per unit of running time compared to collisions with protons.