Heidelberg 2022 – scientific programme

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T: Fachverband Teilchenphysik

T 76: Search for Dark Matter 3

T 76.3: Talk

Wednesday, March 23, 2022, 16:45–17:00, T-H35

Search for Dark Matter in a tW+MET signature with the ATLAS experiment — •Ben Brüers — Deutsches Elektronen Synchrotron DESY, Zeuthen, Germany

Dark Matter (DM) remains one of the unrevealed mysteries of the universe. Even though it constitutes ∼ 80 % of the matter, considerably little is known about DM, despite it significantly influences the dynamics of galaxies and the expansion of the universe. The search for DM at colliders, probing mainly a particle nature of the unknown matter, marks an important pillar in exploring all possible realisations of DM. This talk will present a search for DM with the ATLAS experiment, where the DM is coupled to the Standard Model (SM) via a pseudo-scalar mediator within an extended two-Higgs-doublet model (2HDM+a). The associated production of DM with a W-boson and a top-quark is considered. As the DM deposits no energy in the detector, the experimental signature includes high missing transverse energy (E_T^miss). To reconstruct highly energetic W-bosons, expected for signals with a heavy H⁺, large-radius jets are employed. The talk will give an introduction to the analysis and present the most recent results.