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.
Highlights
No significant amount of primordial antimatter is found in the present universe and any initial matter–antimatter asymmetry would have been eliminated by inflation
These facts lead to the problem of baryon asymmetry in the universe (BAU)
There have been a number of successful baryogenesis scenarios, all of which require new physics beyond the minimal standard model (SM)
Summary
No significant amount of primordial antimatter is found in the present universe and any initial matter–antimatter asymmetry would have been eliminated by inflation These facts lead to the problem of baryon asymmetry in the universe (BAU). The phenomena of neutrino oscillations imply that the three neutrinos should have different masses and mix with each other This again calls for new physics since the neutrinos are massless in the SM. Our leptogenesis requires the existence of a lepton-number violation, which, is not allowed to contribute any Majorana neutrino masses. For this purpose we shall impose an unbroken Z4 discrete symmetry. Our model can be tested in the running and forthcoming neutrino oscillation experiments such as NOνA and JUNO, and can be excluded by any observations of neutrinoless double beta decay
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