Abstract
We show that a muon collider is ideally suited for the study of heavy H/A scalars, cousins of the Higgs boson found in two-Higgs-doublet models and required in supersymmetric models. The key aspects of H/A are: (1) they are narrow, yet have a width-to-mass ratio far larger than the expected muon collider beam-energy resolution, and (2) the larger muon Yukawa allows efficient s-channel production. We study in detail a representative Natural Supersymmetry model which has a 1.5TeVH/A with mH−mA=10GeV. The large event rates at resonant peak allow the determination of the individual H and A resonance parameters (including CP) and the decays into electroweakinos provide a wealth of information unavailable to any other present or planned collider.
Highlights
The discovery at the LHC of a standard model (SM) like Higgs at mH = 125 GeV [1,2] has greatly altered our theoretical expectations. The couplings of this state to electroweak gauge bosons makes it clear that the majority of electroweak symmetry breaking is associated with this SM-like Higgs boson
It is required in supersymmetric models that there are other spin-zero states left behind after electroweak symmetry breaking
Heavy neutral Higgses H/ A and charged Higgses H±, of two-Higgs-doublet models (2HDM), are a simple and well-motivated possibility for new physics. Despite their intimate connection to electroweak symmetry breaking, the H/ A interact weakly with the Higgs boson itself, H/ A can be quite heavy without rendering these scenarios unnatural
Summary
The discovery at the LHC of a standard model (SM) like Higgs at mH = 125 GeV [1,2] has greatly altered our theoretical expectations The couplings of this state to electroweak gauge bosons makes it clear that the majority (if not all) of electroweak symmetry breaking is associated with this SM-like Higgs boson. Heavy neutral Higgses H/ A and charged Higgses H±, of two-Higgs-doublet models (2HDM), are a simple and well-motivated possibility for new physics Despite their intimate connection to electroweak symmetry breaking, the H/ A interact weakly with the Higgs boson itself, H/ A can be quite heavy without rendering these scenarios unnatural. The fact that the heavy Higgses must be produced in association makes extracting the H/ A masses and widths challenging
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