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T: Fachverband Teilchenphysik

T 62: Higgs Boson: Extended Models 2

T 62.5: Vortrag

Mittwoch, 23. März 2022, 17:15–17:30, T-H21

Search for A→ ZH→ ℓℓ tt at √s = 13 TeV with the ATLAS detector — •Roman Kuesters, Tetiana Moskalets, and Spyros Argyropoulos — University of Freiburg, Freiburg im Breisgau, Germany

The generation of the matter-antimatter asymmetry in the universe is one of the biggest open questions that require physics beyond the Standard Model. An attractive explanation is provided by the electroweak baryogenesis models, which require the addition of a second Higgs doublet, giving rise to five Higgs bosons: a light (heavy) CP-even Higgs h(H), a CP-odd one (A) and two charged ones (H^±). A necessary requirement for baryogenesis is a large mass splitting between the heavy CP-odd and CP-even Higgs bosons, which makes the A→ ZH decay dominant.

This talk presents a search for the A→ ZH→ ℓℓ tt process, targeting the phase space with m_H > 350 GeV, which has not been explored so far. The talk will discuss the optimisation of the event selection and the sensitivity expected to be achieved with the full Run 2 ATLAS data.