Abstract
We discuss the phenomenology of several Beyond the Standard Model (SM) extensions that include extended Higgs sectors. The models discussed are: the SM extended by a complex singlet field (CxSM), the 2-Higgs-Doublet Model with a CP-conserving (2HDM) and a CP-violating (C2HDM) scalar sector, the singlet extension of the 2-Higgs-Doublet Model (N2HDM), and the Next-to-Minimal Supersymmetric SM extension (NMSSM). All the above models have at least three neutral scalars, with one being the 125 GeV Higgs boson. This common feature allows us to compare the production and decay rates of the other two scalars and therefore to compare their behaviour at future electron-positron colliders. Using predictions on the expected precision of the 125 GeV Higgs boson couplings at these colliders we are able to obtain the allowed admixtures of either a singlet or a pseudoscalar to the observed 125 GeV scalar. Therefore, even if no new scalar is found, the expected precision at future electron-positron colliders, such as CLIC, will certainly contribute to a clearer picture of the nature of the discovered Higgs boson.
Highlights
The discovery of the Higgs boson by the LHC experiments ATLAS [1] and CMS [2] has triggered the search for new scalars as predicted by beyond the Standard Model (BSM) models with extended Higgs sectors
No new scalars were found at the LHC up until now, and no solid hints of new physics have been reported by the LHC Collaborations, the increasing precision in the measurement of the Higgs couplings to fermions and gauge bosons has dramatically reduced the parameter space of BSM models
In a previous work [7] we have shown that before the LHC Run 2 the allowed admixture of the singlet was below 25% for Type I and the predictions for CLIC@350GeV and CLIC@3TeV are below 0.85% and 0.22%, respectively
Summary
The discovery of the Higgs boson by the LHC experiments ATLAS [1] and CMS [2] has triggered the search for new scalars as predicted by beyond the Standard Model (BSM) models with extended Higgs sectors. We hope that we can shed some light on the relevance of a future electron-positron collider for BSM Higgs searches. The second one is, to what extent can a future electron-positron collider distinguish between the different BSM versions if a new Higgs boson is found? This is part (see [3,4,5,6] for recent studies on similar subjects) of an effort to build a strong physics case for the electron-positron colliders.
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