Scalar singlets at present and future colliders

TL;DR

This paper evaluates the potential for discovering scalar singlets at current and future colliders, comparing direct search capabilities with Higgs coupling measurements, and applies findings to models like NMSSM and Twin Higgs.

Contribution

It provides a comprehensive analysis of scalar singlet detection prospects across collider stages, including model-specific implications for NMSSM and Twin Higgs.

Findings

Future colliders can significantly improve singlet discovery reach.

Higgs coupling measurements complement direct searches effectively.

Scalar singlet detection prospects vary across models and collider energies.

Abstract

A scalar singlet, coupled to the other particles only through its mixing with the Higgs boson, appears in several motivated extensions of the Standard Model. The prospects for the discovery of a generic singlet at the various stages of the LHC, as well as at future high-energy colliders, are studied, and the reach of direct searches is compared with the precision attainable with Higgs couplings measurements. The results are then applied to the NMSSM and Twin Higgs.