Neutrinoless Double Beta Decay and High-Scale Baryogenesis

TL;DR

This paper discusses how observing neutrinoless double beta decay can constrain high-scale baryogenesis models by revealing lepton number violation, which could wash out primordial baryon asymmetry, and explores methods to detect such decay.

Contribution

It analyzes the implications of neutrinoless double beta decay observations on high-scale baryogenesis scenarios and suggests experimental approaches to test these effects.

Findings

Observation of neutrinoless double beta decay can exclude certain baryogenesis models.

Multiple isotope measurements can help confirm lepton number violation.

Connections with low energy lepton flavor violation and LHC processes are highlighted.

Abstract

The constraints on baryogenesis models obtained from an observation of neutrinoless double beta decay are discussed. The lepton number violating processes, which can underlie neutrinoless double beta decay, would together with sphaleron processes, which are effective in a wide range of energies, wash out any primordial baryon asymmetry of the universe. Typically, if a mechanism of neutrinoless double beta decay other than the standard light neutrino exchange is observed, typical scenarios of high-scale baryogenesis will be excluded. This can be achieved by different methods, e.g. through the observation in multiple isotopes or the measurement of the decay distribution. In addition, we will also highlight the connection with low energy lepton flavour violation and lepton number violation at the LHC.