Lepton Number Violation and the Baryon Asymmetry of the Universe

TL;DR

This paper reviews the connection between lepton number violation, neutrinoless double beta decay, collider processes, and the baryon asymmetry of the universe, emphasizing the need for mechanisms to preserve baryogenesis.

Contribution

It highlights the critical relationship between lepton number violating processes and baryogenesis, and discusses conditions under which the baryon asymmetry can be preserved.

Findings

Lepton number violation can erase baryon asymmetry without stabilization mechanisms.

Constraints from neutrinoless double beta decay impact baryogenesis models.

Collider processes can provide insights into lepton number violation and baryon asymmetry.

Abstract

Neutrinoless double beta decay, lepton number violating collider processes and the Baryon Asymmetry of the Universe (BAU) are intimately related. In particular lepton number violating processes at low energies in combination with sphaleron transitions will typically erase any pre-existing baryon asymmetry of the Universe. In this contribution we briefly review the tight connection between neutrinoless double beta decay, lepton number violating processes at the LHC and constraints from successful baryogenesis. We argue that far-reaching conclusions can be drawn unless the baryon asymmetry is stabilized via some newly introduced mechanism.