Revisiting the high-scale validity of Type-II seesaw model with novel LHC signature

TL;DR

This paper investigates the high-scale validity of the Type-II seesaw model, demonstrating it can remain stable up to the Planck scale and proposing novel LHC signatures to test the model's predictions.

Contribution

It provides a detailed analysis of the model's stability constraints and introduces new LHC signatures for testing the model at current and future collider runs.

Findings

Model can be stable up to the Planck scale with constraints on scalar masses and mixing angles.

Proposes a new LHC probe via associated and pair production of charged scalars.

Potential to achieve 5σ significance at current LHC run for specific signals.

Abstract

The Type-II seesaw model is a well-motivated new physics scenario to address the origin of the neutrino mass issue. We show that this model can easily accommodate an absolutely stable vacuum until the Planck scale, however with strong limit on the exotic scalar masses and the corresponding mixing angle. We examine the model prediction at the current and future high luminosity run of the Large Hadron Collider (LHC) for the scalar masses and mixing angles fixed at such high-scale valid region. Specifically, we device the associated and pair production of the charged scalars as a new probe of the model at the LHC. We show that for a particular signal process the model can be tested with $5\sigma$ signal significance even at the present run of the LHC.