Thermal Wash-in Leptogenesis via Heavy Higgs Decay

TL;DR

This paper proposes a simple three-Higgs doublet model where heavy Higgs decays generate asymmetries in conserved charges, which are then converted into baryon and lepton asymmetries through wash-in mechanisms involving right-handed neutrinos.

Contribution

It introduces a novel three-Higgs doublet framework for leptogenesis that operates via heavy Higgs decay and wash-in processes, distinct from traditional models.

Findings

Heavy Higgs decay produces asymmetries in conserved charges.

Asymmetries are converted into baryon/lepton asymmetry via wash-in.

Model provides a new mechanism for generating matter-antimatter asymmetry.

Abstract

We present a conceptually simple model to generate asymmetries that are not directly related to baryon nor lepton charges. The model employs a three-Higgs doublet framework, wherein the other two Higgs fields are significantly heavier than the Standard Model (SM) Higgs field. The decay of these heavier Higgs fields generates asymmetry for approximately conserved charges in the Standard Model at a high temperature. These asymmetries will be converted into baryon/lepton asymmetry through $B-L$ violating interactions associated with right-handed neutrinos via the wash-in mechanism.