Heidelberg 2022 – scientific programme

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T: Fachverband Teilchenphysik

T 76: Search for Dark Matter 3

T 76.2: Talk

Wednesday, March 23, 2022, 16:30–16:45, T-H35

Search for Dark Matter at the ATLAS detector with a W-boson and a top-quark in the final state — •Paul Moder¹, Alvaro Lopez Solis², Ben Brüers², and Claudia Seitz¹ — ¹DESY Hamburg — ²DESY Zeuthen

The Standard Model (SM) is one of the most robust models in particle physics containing all observed elementary particles and their interactions. Over the years, its predictions were tested and proven in a number of experiments. However, there are still observations that can not be explained by the SM with one of the most prominent ones being the existence of Dark Matter (DM). While the existence of DM was first theorised through astronomical observations, extensions of the SM allow for a search of DM at the Large Hadron Collider (LHC) as well. Since DM can not be detected directly, final states analysing its existence at the LHC are always designed around high missing transverse energy. This talk will present such a search at the ATLAS detector based on an extended two-Higgs-doublet model (2HDM+a) where the pseudo-scalar mediator allows the production of DM in the final state. In addition to the DM, a top-quark and a W-boson are produced in the final state, where the W-boson of this signal process can be expected to have high momentum. This allows for a unique technique by tagging these W-bosons through large-radius jets increasing the sensitivity of the signal process. This talk presents the cut-based definitions for an analysis with zero leptons in the final state as well as the most recent results.