Exotic Higgs Decays in the Type-II 2HDMs at Current and Future pp Colliders

TL;DR

This paper explores the potential of current and future proton-proton colliders to discover exotic Higgs decay modes within the Type-II 2HDM, highlighting the significant reach of a 100 TeV collider for probing the model's parameter space.

Contribution

It provides a comprehensive analysis of the sensitivity of future colliders to exotic Higgs decays in the Type-II 2HDM, extending current constraints and emphasizing the capabilities of a 100 TeV collider.

Findings

A 100 TeV collider can probe nearly the entire viable parameter space of the Type-II 2HDM.

Current searches constrain certain decay modes, but future colliders will significantly extend this reach.

Exotic decay channels like $A ightarrow HZ$, $A ightarrow H^"+ W^"-$, and $H^"+ ightarrow H W^"+ are promising discovery modes.

Abstract

The exotic decay modes of non-Standard Model Higgses can serve as powerful search channels to explore the parameter space of extended Higgs sectors. In this Snowmass contribution, we illustrate this using the Two-Higgs Doublet Model (2HDM) as an example. We first review the current experimental constraints on the parameter space of a Type-II 2HDM arising from existing searches for the exotic Higgs decay mode $A/H\rightarrow HZ/AZ$. We then present the sensitivity of future colliders to discover addition Higgs bosons using the exotic decay channels $A\rightarrow HZ$, $A\rightarrow H^\pm W^\mp$ and $H^\pm\rightarrow H W^\pm$. We find that a 100 TeV collider can probe almost the entire region of the Type-II 2HDM parameter space that survives current theoretical and experimental constraints and would therefore be an ideal machine to search for heavier Higgses in hierarchical scalar sectors.