Probing TeV Left-Right Seesaw at Energy and Intensity Frontiers: a Snowmass White Paper

TL;DR

This paper explores how TeV-scale left-right seesaw models can be tested at high-energy colliders and low-energy experiments, focusing on neutrino mass origins, observable signals, and lepton flavor violation.

Contribution

It analyzes both standard and large mixing variants of TeV-scale left-right seesaw models, highlighting their distinct experimental signatures and implications.

Findings

Potential signals at the LHC for left-right symmetry

Enhanced lepton flavor violation in certain models

Implications for neutrinoless double beta decay

Abstract

We discuss ways to probe the origin of neutrino masses at the Energy and Intensity frontiers, in TeV-scale left-right seesaw models where small neutrino masses arise via type-I seesaw mechanism. We consider generic ('vanilla') version of such models as well as a version which leads to 'large' light-heavy neutrino mixing while keeping the neutrino masses small in a natural manner. We point out specific observable implications of these classes of models at the LHC as well as in searches for lepton flavor violating processes such as $\mu\to e\gamma$ and $\mu\to 3e$, and also in searches for lepton number violating neutrinoless double beta decay.