SMuK 2023 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 56: Searches EW I
T 56.4: Vortrag
Mittwoch, 22. März 2023, 16:35–16:50, HSZ/0403
Search for A→ ZH→ ℓℓ tt at √s = 13 TeV with the ATLAS detector — •Roman Kuesters, Tetiana Moskalets, and Spyros Argyropoulos for the ATLAS collaboration — University of Freiburg, Freiburg im Breisgau, Germany
The generation of the existing matter-antimatter asymmetry in the observable universe is one of the biggest open questions that cannot be explained with the standard model and therefore requires physics beyond the standard model.
Many models suggest that electroweak symmetry breaking can generate the matter-antimatter asymmetry, however an extended Higgs sector is needed to satisfy the conditions for baryogenesis.One of the simplest extensions are models with two Higgs doublets, which give rise to 5 Higgs bosons. In these models a large mass splitting between the heavy CP-odd boson A and the CP-even boson H is required for successful baryogenesis.
The analysis, which will be presented, searches for the decay of the A boson into a heavy H boson and a Z boson. The heavy H boson subsequently decays into two top quarks, while the Z boson decays leptonically. This final state will allow us to probe the the parameter space with mH > 350 GeV, which remains so far unexplored. In the presentation the analysis optimisation and the setup for the statistical analysis will be shown. Finally the expected exclusion limits will be presented.