TeV-scale Pseudo-Dirac Seesaw Mechanisms in an E$_6$ Inspired Model

TL;DR

This paper proposes a TeV-scale E6-inspired model featuring a pseudo-Dirac neutrino seesaw mechanism, new gauge interactions, and potential explanations for the 750 GeV di-photon excess, with testable collider signatures.

Contribution

It introduces a novel E6-inspired framework enabling a TeV-scale pseudo-Dirac neutrino seesaw with sizable Yukawa couplings and multiple new particles at the TeV scale.

Findings

Potential collider signatures of new Z' bosons and long-lived fermions.

Natural realization of sizeable Yukawa couplings at TeV scale.

Three possible explanations for the 750 GeV di-photon excess.

Abstract

TeV-scale seesaw mechanisms are interesting due to their potential testability at existing collider experiments. Herein we propose an E$_6$-inspired model allowing a TeV-scale pseudo-Dirac singlet neutrino seesaw mechanism with naturally sizeable Yukawa couplings of $\mathcal{O}(10^{-2})$. The model also contains new U(1) gauge interactions (and associated $Z^\prime$ bosons with which the singlet neutrinos can be produced at colliders), typically long-lived colour triplet fermions, SU(2) doublet fermions, and a complex scalar - potentially all at the TeV-scale. Additionally we identify three possible explanations for the 750 GeV di-photon excess.