Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 25: Higgs Physics IV (BSM Higgs)

T 25.1: Vortrag

Dienstag, 1. April 2025, 16:15–16:30, ZHG105

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

All measurements of the Higgs boson at 125 GeV so far agree with the standard model (SM) prediction, however the observed resonance could still 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 will present a search for a hypothetical 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 anti-top quark pair. This channel has been dubbed the smoking gun channel for various 2HDMs in the context of electroweak baryogenesis. We will focus on the fully hadronic decay of the tt pair, presenting improvements of the analysis strategy and first results with data measured by CMS at 13.6 TeV.