Leptogenesis parametrized by lepton mass matrices

TL;DR

This paper proposes a left-right symmetric model linking baryon asymmetry to lepton masses, predicting specific neutrino properties and testable in future experiments.

Contribution

It introduces a novel scenario where baryon asymmetry is directly related to charged lepton masses and a hermitian Dirac neutrino mass matrix, with testable predictions.

Findings

Baryon asymmetry depends on charged lepton masses and a hermitian Dirac neutrino mass matrix.

Neutrinos must have a normal hierarchical mass spectrum.

Model predicts observable effects in neutrino oscillation and neutrinoless double beta decay experiments.

Abstract

The conventional seesaw-leptogenesis can simultaneously explain the suppression of neutrino masses and the generation of cosmic baryon asymmetry, but usually cannot predict an unambiguous relation between these two sectors. In this work we shall demonstrate a novel left-right symmetric scenario, motivated to solve the strong CP problem by parity symmetry, where the present baryon asymmetry is determined by three charged lepton masses and a seesaw-suppressed hermitian Dirac neutrino mass matrix up to an overall scale factor. To produce the observed baryon asymmetry, this scenario requires that the neutrinos must have a normal hierarchical mass spectrum and their mixing matrix must contain a sizable Dirac CP phase. Our model can be tested in neutrino oscillation and neutrinoless double beta decay experiments.