SM scalar and extra singlet(s)

TL;DR

This paper explores the possibility that the LHC might not detect the Higgs boson, suggesting singlet scalars could be present and significant for astroparticle physics, potentially making the ILC necessary for further study.

Contribution

It proposes that singlet scalars could exist without Higgs detection at LHC and discusses their implications for astroparticle physics and future colliders.

Findings

Singlet scalars may be present if no Higgs signal is observed at LHC.

Electroweak data could favor models with singlet scalars over the Standard Model.

The ILC might be essential to study the Higgs sector if the LHC finds no signal.

Abstract

I discuss the question whether it is possible that the LHC will find no signal for the Higgs boson. It is argued that in this case singlet scalars should be present that could play an important role in astroparticle physics. A critical view at the existing electroweak data shows that this possibility might be favored over the simplest standard model. In this case one needs the ILC in order to study the Higgs sector.