Erlangen 2026 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 54: Higgs Physics VI

T 54.1: Vortrag

Mittwoch, 18. März 2026, 16:15–16:30, KH 01.019

Search for heavy neutral Higgs bosons A and H in the ttZ channel at CMS — •Yannick Fischer, Matteo Bonanomi, Lukas Ebeling, Johannes Haller, and Matthias Schröder — Institut für Experimentalphysik, Universität Hamburg

While the measurements of the Higgs boson at 125 GeV are so far consistent with the standard model (SM) prediction, the observed particle might well be part of an extended Higgs sector. Such an extended Higgs sector is predicted by many theories of physics beyond the SM. Two Higgs Doublet Models (2HDM) assume the existence of a second Higgs doublet, giving rise to a total of five physical Higgs bosons. This talk presents a search for a hypothetical heavy CP-odd Higgs boson A decaying into a hypothetical CP-even heavy Higgs boson H and a Z boson, with the H decaying into a top quark-antiquark pair. This channel has been dubbed the "smoking gun" channel for electroweak baryogenesis in 2HDMs. We will present the status of A→ ZH with H→ tt searches at CMS at 13 and 13.6 TeV centre-of-mass energy, focusing on the fully-hadronic decay channel of the tt system. The results exclude masses of the A boson up to several TeV and constrain the 2HDM parameter space relevant for electroweak baryogenesis.

Keywords: 2HDM; Higgs; BSM