Testable Baryogenesis in Seesaw Models

TL;DR

This paper examines baryogenesis in the minimal type I seesaw model with GeV-scale Majorana neutrinos, highlighting how future experiments could test and predict the universe's matter-antimatter asymmetry.

Contribution

It incorporates washout effects from various scattering processes into the analysis of baryogenesis in the minimal seesaw model, linking experimental prospects to theoretical predictions.

Findings

Future SHiP and neutrinoless double beta decay experiments could predict the baryon asymmetry.

SHiP measurements could provide insights into the PMNS CP phases.

Inverted neutrino mass ordering enhances testability of the model.

Abstract

We revisit the production of baryon asymmetries in the minimal type I seesaw model with heavy Majorana singlets in the GeV range. In particular 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. We also show that SHiP measurements could provide very valuable information on the PMNS CP phases.