Falsifying High-Scale Baryogenesis with Neutrinoless Double Beta Decay and Lepton Flavor Violation

TL;DR

This paper explores how observing neutrinoless double beta decay could challenge high-scale baryogenesis models unless new mechanisms are proposed, especially considering lepton flavor violation effects.

Contribution

It demonstrates that non-standard mechanisms of neutrinoless double beta decay can exclude high-scale baryogenesis unless additional stabilization mechanisms are introduced.

Findings

Observation of non-standard neutrinoless double beta decay mechanisms constrains baryogenesis models.

Lepton flavor violation extends the constraints beyond the first lepton generation.

High-scale baryogenesis scenarios are challenged unless new stabilizing mechanisms are identified.

Abstract

Interactions that manifest themselves as lepton number violating processes at low energies in combination with sphaleron transitions typically erase any preexisting baryon asymmetry of the Universe. In this article, we discuss the constraints obtained from an observation of neutrinoless double beta decay in this context. If a new physics mechanism of neutrinoless double beta decay other than the standard light neutrino exchange is observed, typical scenarios of high-scale baryogenesis will be excluded unless the baryon asymmetry is stabilized via some new mechanism. We also sketch how this conclusion can be extended beyond the first lepton generation by incorporating lepton flavor violating processes.