Constraining extended scalar sectors at current and future colliders -- an update

TL;DR

This paper reviews recent results on models extending the Standard Model's scalar sector, focusing on singlet extensions, and discusses how current and future colliders can constrain these models through electroweak precision tests and scalar production measurements.

Contribution

It provides updated analyses of singlet scalar extensions and their detectability at colliders, including electroweak phase transition tests and scalar production cross-sections.

Findings

Electroweak precision measurements can test strong first-order phase transitions.

Production cross-sections for non-standard scalars are calculable at Higgs factories.

Updated constraints improve the understanding of scalar sector extensions.

Abstract

In this proceeding, I discuss several models that extend the scalar sector of the Standard Model by additional matter states. I here focus on results for models with singlet extensions, which have been obtained recently and update some of the results presented in previous work. In more detail, I will briefly review the option to test a strong first-order electroweak phase transition using precision measurements in the electroweak sector, as well as production cross-sections for non-standard scalar production at Higgs factories.