Testable Baryogenesis in Seesaw Models (NuFact 2016)

TL;DR

This paper investigates baryogenesis in minimal type I seesaw models with GeV-scale Majorana neutrinos, emphasizing washout effects and the potential for future experiments to predict the universe's matter-antimatter asymmetry.

Contribution

It demonstrates that in minimal models with two singlets and inverted neutrino hierarchy, future experiments could predict baryon asymmetry.

Findings

Washout effects significantly influence baryogenesis predictions.

Future SHiP and neutrinoless double beta decay experiments could determine the matter-antimatter asymmetry.

Inverted neutrino hierarchy models are particularly promising for such predictions.

Abstract

We revisit the production of baryon asymmetries in the minimal type I seesaw model with heavy Majorana singlets in the GeV range. We include "washout" effects from scattering processes with gauge bosons, higgs decays and inverse decays, besides the dominant top scatterings. We show that in the minimal model with two singlets, and for an inverted light neutrino ordering, future measurements from SHiP and neutrinoless double beta decay could in principle provide sufficient information to predict the matter-antimatter asymmetry in the universe.