Discriminators of 2 Higgs Doublets at the LHC14, ILC and MuonCollider(125): A Snowmasss White Paper

TL;DR

This paper evaluates how future collider experiments can distinguish a general two-Higgs-doublet model from the Standard Model Higgs, addressing the hierarchy problem and exploring extended Higgs sectors.

Contribution

It provides a comprehensive analysis of the sensitivity of LHC14, ILC, and Muon Collider to differentiate a general 2HDM from the SM Higgs boson.

Findings

Future colliders can effectively distinguish 2HDM from SM Higgs.

Coupling measurements are key to identifying extended Higgs sectors.

The study links 2HDM signatures to singlet Higgs extensions.

Abstract

The historic LHC discovery of the 125 GeV particle with properties that closely resemble the Standard Model (SM) Higgs boson verifies our understanding of electroweak symmetry breaking, but solidifies the need for a resolution to the hierarchy problem. Many extensions of the SM that address the hierarchy problem contain a non-minimal Higgs sector. Therefore, as a benchmark alternative to the SM Higgs mechanism, we study a general 2 Higgs doublet model (2HDM-G) framework for evaluating future sensitivity to Higgs couplings. We study how well it can be distinguished from the SM Higgs boson by future measurements at LHC14, ILC (250, 500,1000 GeV) and a Muon Collider (125 GeV). Additionally, our study bears on singlet Higgs extensions of two Higgs doublet models through predicted coupling relationships.