Erlangen 2026 – scientific programme

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T: Fachverband Teilchenphysik

T 101: Searches/BSM VI

T 101.2: Talk

Friday, March 20, 2026, 09:15–09:30, KH 02.018

Studies towards a search for heavy resonances X→YH→ttbb in the single-lepton final state with CMS — •Syed Sajal Hasan, Matteo Bonanomi, Mathis Frahm, Johannes Haller, Lara Sophie Markus, and Matthias Schröder — Institut für Experimentalphysik, Universität Hamburg

Many theories of physics beyond the Standard Model (SM) predict additional heavy particles, such as new scalars in extended Higgs sectors. In this study, we explore a generic scenario in which a heavy resonance X decays into a lighter new particle Y and a SM-like Higgs boson (H), X→YH, followed by Y→tt and H→bb decays. This cascade topology has not yet been probed at the LHC. The analysis uses simulated CMS data at a centre-of-mass energy of 13.6 TeV and targets events with a single isolated lepton and multiple jets. Candidate events are selected based on jet and b-tagged-jet multiplicities, and a neural network classifier is employed to enhance the separation between signal and SM backgrounds. Expected exclusion limits are presented as a function of the masses of X and Y for the signal production cross-section.

Keywords: 2HDM; Heavy Higgs; Single lepton final state; XtoYH