# Exotic Higgs Decays in Type-II 2HDMs at the LHC and Future 100 TeV Hadron Colliders

## TL;DR

This paper investigates the potential of future high-energy colliders to detect exotic Higgs decay modes in Type-II 2HDMs, which could reveal new physics beyond the Standard Model through specific decay channels.

## Contribution

It provides a detailed analysis of the discovery prospects for exotic Higgs decay channels at the LHC and a future 100 TeV collider within Type-II 2HDMs, highlighting the collider's ability to probe the entire viable parameter space.

## Key findings

- A 100 TeV collider can explore the full parameter space of Type-II 2HDMs with exotic decay branching fractions over 20%.
- Exotic decay channels like A -> HZ, A -> H^+ W, and H^+ -> HW are promising search modes.
- Future colliders significantly enhance the discovery potential for non-Standard Model Higgs decays.

## Abstract

The exotic decay modes of non-Standard Model (SM) Higgses in models with extended Higgs sectors have the potential to serve as powerful search channels to explore the space of Two-Higgs Doublet Models (2HDMs) that cannot be studied effectively using conventional decay channels. Once kinematically allowed, heavy Higgses could decay into pairs of light non-SM Higgses, or a non-SM Higgs and a SM gauge boson, with branching fractions that dominate those of the conventional decay modes to SM particles. In this study, we focus on the prospects of probing exotic decay channels at the LHC and a future 100 TeV \emph{pp} collider in the context of Type-II 2HDMs. We study the three prominent exotic decay channels, A -> HZ, A -> H^+ W and H^+ -> HW, and find that a 100-TeV pp collider can probe the entire region of the Type-II 2HDM parameter space that survives current theoretical and experimental constraints with exotic decay branching fraction > 20%.