# Low-scale Leptogenesis with Minimal Lepton Flavour Violation

## TL;DR

This paper investigates the potential for low-scale leptogenesis within minimal lepton flavour violation frameworks, highlighting the conditions under which resonant leptogenesis can succeed and implications for low-energy experiments.

## Contribution

It demonstrates that resonant leptogenesis is feasible in both inverse and linear seesaw models with MLFV, identifying parameter space constraints and experimental implications.

## Key findings

- Resonant leptogenesis is possible in both ISS and LSS scenarios.
- MLFV-ISS requires fine-tuning of Majorana masses for success.
- LSS scenario has a broader viable parameter space.

## Abstract

We analyse the feasibility of low-scale leptogenesis where the inverse seesaw (ISS) and linear seesaw (LSS) terms are not simultaneously present. In order to generate the necessary mass splittings, we adopt a Minimal Lepton Flavour Violation (MLFV) hypothesis where a sterile neutrino mass degeneracy is broken by flavour effects. We find that resonant leptogenesis is feasible in both scenarios. However, because of a flavour alignment issue, MLFV-ISS leptogenesis succeeds only with a highly tuned choice of Majorana masses. For MLFV-LSS, on the other hand, a large portion of parameter space is able to generate sufficient asymmetry. In both scenarios we find that the lightest neutrino mass must be of order $10^{-2}\text{ eV}$ or below for successful leptogenesis. We briefly explore implications for low-energy flavour violation experiments, in particular $\mu \rightarrow e\,\gamma$. We find that the future MEG-II experiment, while sensitive to MLFV in our setup, will not be sensitive to the specific regions required for resonant leptogenesis.