# Neutrino Mass Generation at TeV Scale and New Physics Signatures from Charged Higgs at the LHC for Photon Initiated Processes

## TL;DR

This paper explores a Standard Model extension with an EW isospin 3/2 scalar and vector-like fermions, focusing on collider signatures of multi-charged scalars at the LHC, including photon fusion effects and mass constraints.

## Contribution

It introduces a novel scalar quadruplet model for neutrino mass generation and analyzes its collider phenomenology, especially multi-charged scalar signatures at the LHC.

## Key findings

- Photon fusion significantly affects production of multi-charged scalars at high masses.
- Lower mass limit of 725 GeV established for doubly charged scalars.
- Distinct multi-lepton signatures predicted for LHC detection.

## Abstract

We consider the collider phenomenology of a simple extension of the Standard Model (SM), which consists of an EW isospin $3/2$ scalar, $\Delta$ and a pair of EW isospin $1$ vector like fermions, $\Sigma$ and $\bar{\Sigma}$, responsible for generating tiny neutrino mass via the effective dimension seven operator. This scalar quadruplet with hypercharge Y = 3 has a plethora of implications at the collider experiments. Its signatures at TeV scale colliders are expected to be seen, if the quadruplet masses are not too far above the electroweak symmetry breaking scale. In this article, we study the phenomenology of multi-charged quadruplet scalars. In particular, we study the multi-lepton signatures at the Large Hadron Collider (LHC) experiment, arising from the production and decays of triply and doubly charged scalars. We studied Drell-Yan (DY) pair production as well as pair production of the charged scalars via photon-photon fusion. For doubly and triply charged scalars, photon fusion contributes significantly for large scalar masses. We also studied LHC constraints on the masses of doubly charged scalars in this model. We derive a lower mass limit of 725 GeV on doubly charged quadruplet scalar.