Heidelberg 2022 – scientific programme

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T: Fachverband Teilchenphysik

T 62: Higgs Boson: Extended Models 2

T 62.6: Talk

Wednesday, March 23, 2022, 17:30–17:45, T-H21

Search for heavy Higgs bosons in the Z + tt final states with CMS — •Yannick Fischer, Ksenia de Leo, Johannes Haller, Daniel Hundhausen, and Matthias Schröder — Institut für Experimentalphysik, Universität Hamburg

Since its discovery in 2012, the properties of the Higgs boson at 125 GeV have been studied in numerous measurements. Within the uncertainties all results suggest a Standard Model like behaviour. However, the observed boson might well be part of an extended Higgs sector, which is predicted in various scenarios of new physics beyond the standard model. Two Higgs Doublet Models (2HDM) provide a generic description of the phenomology arising in models with a second Higgs doublet. In this talk we will investigate the hypothetical decay of a CP odd heavy Higgs boson A decaying into a CP even heavy Higgs boson H and a Z boson, with the H decaying further into a pair of top quarks. This decay channel is particularly relevant in the high mass and low tan(β) .We will give an overview about the parameter space with detailed phenomenological studies, the results of the investigations of the kinematic properties of the decay products and present first expected exclusion limits in the decay channel Z → µ⁺ µ⁻ and t t → jets.