Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 82: Invited Topical Talks 6

T 82.1: Eingeladener Vortrag

Donnerstag, 24. März 2022, 14:00–14:25, T-H16

Searches for new scalar particles at the LHC — •Dominik Duda — Max-Planck-Institut für Physik

The Higgs boson discovery by the ATLAS and CMS experiments at the Large Hadron Collider was a great success. Ever since, numerous studies have been performed to establish whether it is a Standard Model particle or rather the first observed physical state of an extended scalar sector beyond the Standard Model.

Extended scalar sectors are well motivated as they can modify the electroweak phase transition and facilitate baryogenesis, enhance vacuum stability, provide a dark matter candidate or provide a solution to the strong CP problem (i.e. predict axions). In short, extending the scalar sector provides solutions to some of the questions the Standard Model fails to answer.

Various theories beyond the Standard Model predict the existence of new Higgs bosons in addition to the already discovered one. E.g., the introduction of a second Higgs doublet field in the minimal supersymmetric extension of the Standard Model leads to the prediction of three neutral and two charged Higgs bosons, while an additional Higgs triplet field e.g. in models with a type-II seesaw mechanism would result in seven scalars in total. The discovery of such new scalar particles would be a direct evidence of new physics.

In this presentation, the latest searches for additional neutral and charged scalars performed with the ATLAS and CMS experiments will be reviewed.