Neutrino Masses and A TeV Scale Seesaw Mechanism

TL;DR

This paper proposes a TeV-scale seesaw mechanism extension of the Standard Model, incorporating new particles and loop-level neutrino mass generation, with phenomenological implications for collider physics and lepton flavor violation.

Contribution

It introduces a novel TeV-scale seesaw model with additional scalars and fermions, and explores its phenomenology including neutrino masses, lepton flavor violation, and collider signatures.

Findings

Heavy Majorana neutrinos can be at the TeV scale.

Model predicts observable collider signatures at the LHC.

Lepton flavor violation processes are within experimental reach.

Abstract

A simple extension of the Standard Model providing TeV scale seesaw mechanism is presented. Beside the Standard Model particles and right-handed Majorana neutrinos, the model contains a singly charged scalar, an extra Higgs doublet and three vector like singly charged fermions. In our model, Dirac neutrino mass matrix raises only at the loop level. Small but non-zero Majorana neutrino masses come from integrating out heavy Majorana neutrinos, which can be at the TeV scale. The phenomenologies of the model are investigated, including scalar mass spectrum, neutrino masses and mixings, lepton flavor violations, heavy neutrino magnetic moments as well as possible collider signatures of the model at the LHC.