Impact of Neutrinoless Double Beta Decay on Models of Baryogenesis

TL;DR

This paper explores how observing neutrinoless double beta decay and related processes can constrain high-scale baryogenesis models, including leptogenesis, by linking low-energy lepton number violation to early universe asymmetry mechanisms.

Contribution

It provides a model-independent analysis showing that neutrinoless double beta decay constrains high-scale baryogenesis and discusses how collider experiments can independently test these scenarios.

Findings

Neutrinoless double beta decay constrains high-scale baryogenesis.

LHC can exclude high-scale leptogenesis scenarios.

Combining lepton flavor violation observations strengthens constraints.

Abstract

Interactions that manifest themselves as lepton number violating processes at low energies in combination with sphaleron transitions typically erase any pre-existing baryon asymmetry of the Universe. We demonstrate in a model independent approach that the observation of neutrinoless double beta decay would impose a stringent constraint on mechanisms of high-scale baryogenesis, including leptogenesis scenarios. Further, we discuss the potential of the LHC to model independently exclude high-scale leptogenesis scenarios when observing lepton number violating processes. In combination with the observation of lepton flavor violating processes, we can further strengthen this argument, closing the loophole of asymmetries being stored in different lepton flavors.