The Muon Collider as a $H/A$ factory

TL;DR

A muon collider offers a unique and efficient platform for studying heavy H/A scalars in two-Higgs doublet and supersymmetric models, enabling detailed resonance and decay analysis due to its production advantages.

Contribution

This paper demonstrates the suitability of muon colliders for detailed H/A scalar studies, highlighting their advantages over other colliders in resonance production and decay analysis.

Findings

Muon colliders can produce H/A scalars efficiently via s-channel.

Resonant peaks allow precise measurement of H/A properties.

Decays into electroweakinos provide unique insights.

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 1.5 Tev H/A with $m_H$- $m_A$ = 10 Gev. 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 provides a wealth of information unavailable to any other present or planned collider.