Higgs ID at the LHC

TL;DR

This paper catalogs extended Higgs sectors with doublets and singlets, analyzing their couplings, and discusses how future collider measurements can distinguish these models from the Standard Model.

Contribution

It provides a comprehensive classification of extended Higgs models with explicit coupling formulas and explores their distinguishability at colliders.

Findings

Explicit Higgs coupling expressions for various models

Identification of parameter regions with detectable deviations

Strategies for differentiating models at LHC and ILC

Abstract

We make a complete catalog of extended Higgs sectors involving SU(2)_L doublets and singlets, subject to natural flavor conservation. In each case we present the couplings of a light neutral CP-even Higgs state h in terms of the model parameters, and identify which models are distinguishable in principle based on this information. We also give explicit expressions for the model parameters in terms of h couplings and exhibit the behaviors of the couplings in the limit where the deviations from the Standard Model Higgs couplings are small. Finally we discuss prospects for differentiation of extended Higgs models based on measurements at the LHC and ILC and identify the regions in which these experiments could detect deviations from the SM Higgs predictions.