TeV-scale seesaw from a multi-Higgs model

TL;DR

This paper proposes a TeV-scale seesaw model extending the Standard Model with an extra Higgs singlet and a tiny-vacuum-VEV Higgs doublet, generating small neutrino masses without tiny Yukawa couplings, consistent with experimental constraints.

Contribution

It introduces a simple extension of the Standard Model with specific Higgs fields to produce tiny neutrino masses at TeV scale without fine-tuning.

Findings

Model satisfies experimental and electroweak constraints.

Predicts neutrinoless double beta decay due to Majorana neutrinos.

Heavy neutrino masses are around a TeV scale.

Abstract

We suggest new simple model of generating tiny neutrino masses through a TeV-scale seesaw mechanism without requiring tiny Yukawa couplings. This model is a simple extension of the standard model by introducing extra one Higgs singlet, and one Higgs doublet with a tiny vacuum expectation value. Experimental constraints, electroweak precision data and no large flavor changing neutral currents, are satisfied since the extra doublet only has a Yukawa interaction with lepton doublets and right-handed neutrinos, and their masses are heavy of order a TeV-scale. Since active light neutrinos are Majorana particles, this model predicts a neutrinoless double beta decay.