Scrutinizing h(125) in Two Higgs Doublet Models at the LHC, ILC, and Muon Collider

TL;DR

This paper evaluates how future colliders like the LHC, ILC, and Muon Collider can precisely measure the Higgs boson's couplings within a two Higgs doublet model framework, testing for deviations from the Standard Model.

Contribution

It provides a comprehensive analysis of the potential precision in measuring Higgs couplings at various future colliders within 2HDMs, including correlations and pattern relations.

Findings

Future colliders can significantly constrain Higgs couplings.

Pattern relations can distinguish between singlet and doublet extensions.

Total width measurements improve coupling determinations.

Abstract

The discovery at the LHC of a scalar particle with properties that are so far consistent with the SM Higgs boson is one of the most important advances in the history of particle physics. The challenge of future collider experiments is to determine whether its couplings will show deviations from the SM Higgs, as this would indicate new physics at the TeV scale, and also to probe the flavor structure of the Yukawa couplings. As a benchmark alternative to the SM Higgs, we consider a generic two Higgs doublet model (2HDM) and analyze the precision to which the LHC14, an ILC250, 500, 1000 GeV and a 125 GeV Muon Collider (MC) can determine the gauge and Yukawa couplings. We allow for correlations among the couplings. We include the impact of a Higgs total width measurement, indirectly at the LHC and ILC and by a direct scan at the MC. We also discuss pattern relations among the couplings that can test for singlet or doublet Higgs extensions of 2HDMs.