SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 142: Neutrinos, Dark Matter XI

T 142.3: Vortrag

Donnerstag, 23. März 2023, 18:00–18:15, HSZ/0003

UV-complete Dark-Matter models and the ATLAS missing-energy-plus-jets measurement — •Martin Habedank and Priscilla Pani — Deutsches Elektronensynchrotron (DESY) Zeuthen

In the Standard Model, the final state of missing energy and at least one jet (MET+jets) at colliders can be mostly attributed to the production of vector bosons in association with jets. Events with Dark Matter in the final state would however also contribute to this channel. It offers therefore a powerful handle in observing or constraining Dark-Matter models.

Traditionally, mostly simplified Dark-Matter models have been used to interpret the MET+jets final state at the LHC. UV-complete models like the two-Higgs-doublet-model with a pseudoscalar mediator to Dark Matter (2HDM+a) provide however a more complex phenomenology, offering many processes that can contribute to the MET+jets final state.

In this talk, insights into the ATLAS measurement of the MET+jets final state in 139 fb⁻¹ of proton–proton collision at 13 TeV are given. Unfolding the measurement allows for direct comparisons to predictions of Standard-Model and beyond without having to take into account detector effects. This is demonstrated in interpreting the measurement with respect to the 2HDM+a and setting stringent parameter constraints on the latter.