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T: Fachverband Teilchenphysik

T 41: Invited Overview Talks III

T 41.2: Invited Overview Talk

Mittwoch, 18. März 2026, 11:30–12:00, AudiMax

Higgs Physics at the LHC and Beyond: Connecting Colliders and the Early Universe — •Thomas Biekötter — Instituto de Física Teórica UAM/CSIC, Madrid, Spain

The discovery of the Higgs boson was a landmark achievement, confirming the mechanism of electroweak symmetry breaking that gives mass to elementary particles. At the same time, it marked the beginning of a deeper quest: to understand the underlying dynamics responsible for this mechanism, and to determine whether the Higgs sector is truly minimal, as predicted by the Standard Model (SM), or part of a richer structure predicting additional Higgs bosons.

I will present a theory overview of Higgs physics at the LHC and how precision measurements of the Higgs boson, together with searches for additional scalar particles, provide powerful probes of physics beyond the SM. Many well-motivated extensions of the Higgs sector link collider phenomenology directly to the early Universe. Extended Higgs sectors can accommodate viable Higgs-portal dark matter scenarios that can be probed at the LHC. Moreover, by altering the nature of the electroweak phase transition, a non-minimal Higgs sector can provide the conditions to dynamically generate the matter-antimatter asymmetry of the universe and leave observable imprints in the form of primordial gravitational waves. I will discuss how incorporating the full wealth of current and future LHC data is essential to obtain realistic, data-driven predictions for complementary observations at space-based gravitational-wave observatories like LISA.

Keywords: Higgs physics; LHC; Electroweak phase transition; Electroweak baryogenesis; Gravitational waves