Göttingen 2025 – scientific programme

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T: Fachverband Teilchenphysik

T 25: Higgs Physics IV (BSM Higgs)

T 25.2: Talk

Tuesday, April 1, 2025, 16:30–16:45, ZHG105

Improving the search for heavy neutral Higgs bosons in the t t Z channel at CMS using parameterized neural networks — •Bianca Weidner, Matteo Bonanomi, Lukas Ebeling, Yannick Fischer, Johannes Haller, Daniel Hundhausen, and Matthias Schröder — Institut für Experimentalphysik, Universität Hamburg

Many theories of physics beyond the Standard Model, such as Two Higgs Doublet Models (2HDM), suggest that the Higgs boson measured at 125 GeV might be part of an extended Higgs sector with five physical Higgs bosons. In this talk, we will explore a promising decay channel involving a hypothetical CP-odd heavy Higgs boson (A), which decays into a CP-even heavy Higgs boson (H) and a Z boson. The H boson then decays into a top quark-antiquark pair. Current analyses exclude signals of up to approximately 1.2 TeV for these hypothetical particles. We will focus on optimizing the analysis by investigating the impact of a parameterized neural network to separate signal events from the background. This approach improves the sensitivity to a potential signal and thus allows probing a larger region of the 2HDM parameter space.