# Scalar phenomenology in type-II seesaw model

## TL;DR

This paper explores the parameter space of the scalar sector in the type-II seesaw model, using experimental and theoretical constraints, and highlights distinctive collider signatures for different parameter regions.

## Contribution

It provides the most updated constraints on the model's parameter space and analyzes collider signatures unique to the scalar triplet in the type-II seesaw model.

## Key findings

- Constraints from LEP and LHC measurements limit the parameter space.
- Different regions predict distinct collider signatures like same-sign dileptons.
- Collider searches can further probe the model's viable parameter space.

## Abstract

In this work we study the viable parameter space of the scalar sector in the type-II seesaw model. In identifying the allowed parameter space, we employ constraints from low energy precision measurements, theoretical considerations and the 125-GeV Higgs data. These tools prove effective in constraining the model parameter space. Moreover, the triplet also offers a rich collider phenomenology from having additional scalars that have unique collider signatures. We find that direct collider searches for these scalars can further probe various parts of the viable parameter space. These parts can be parametrized by the electroweak scalar triplet vacuum expectation value, the mass splitting of the singly- and doubly-charged scalars, and the doubly-charged Higgs mass. We find that different regions of the viable parameter space give rise to different collider signatures, such as the same-sign dilepton, the same-sign $W$ and the multilepton signatures. By investigating various LEP and LHC measurements, we derive the most updated constraints over the whole range of parameter space of the type-II seesaw model.