# Charged Higgs searches in the Georgi-Machacek model at the LHC

## TL;DR

This paper investigates the constraints on the Georgi-Machacek model from LHC charged Higgs searches, showing current bounds limit the model's parameter space and proposing future detection channels with potential for high significance at the HL-LHC.

## Contribution

It provides the first comprehensive analysis of LHC bounds on charged Higgs in the Georgi-Machacek model and proposes a new promising detection channel for future runs.

## Key findings

- Current LHC bounds restrict the triplet vev in the model.
- The combined theoretical and experimental constraints significantly limit the parameter space.
- A new decay channel ($W^{b}$ + Higgs) can be probed with high significance at HL-LHC.

## Abstract

The Georgi-Machacek Model allows for a large triplet vacuum expectation value (vev) with a custodial symmetric scalar potential. This manifestly leads to large charged Higgs coupling to SM fermions thus enhancing the detection probability of the model at the Large hadron collider. We show that the latest bound from LHC searches on singly charged Higgs scalar decaying to top and bottom quark restricts the triplet vev from above. We demonstrate that the combined limit from theoretical constraints and the latest Higgs data together with this charged Higgs bound can already curb the model parameter space significantly. Further, we propose the charged Higgs decaying to $W^{\pm}$ boson and a SM-like Higgs as a prospective channel to probe the yet unbounded model parameter space at the future run of the LHC. A simple cut-based analysis for this channel has been made showing the parameter region that can be probed with $5\sigma$ significance at the high luminosity LHC run.