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T: Fachverband Teilchenphysik

T 76: Search for Dark Matter 3

T 76.5: Vortrag

Mittwoch, 23. März 2022, 17:15–17:30, T-H35

Search for new physics in tt+E_T^miss final states in pp collisions at 13 TeV with the ATLAS experiment. — •Simran Gurdasani — Albert-Ludwigs-Universität, Freiburg, Germany

This talk will present the developments of an ongoing search for Beyond Standard Model (BSM) signatures that can be probed using the tt+E_T^miss final state at the Large Hadron Collider (LHC). Neural Networks are used for the search which is performed on data collected with the ATLAS detector between 2015 and 2018, corresponding to 139 fb⁻¹ of pp data at 13 TeV. Models specifically targeted include DM production via scalar or pseudo-scalar mediators, SUSY stop pair production and Higgs decays to new invisible particles. A two-fold implementation of neural nets is designed, where the first step aims to efficiently reconstruct the hadronically decaying top quarks in a given event. This is designed to specifically target mid-pt range tops decaying to resolved jets. The second step aims to exploit full kinematic correlations of the tt+E_T^miss system and tag a given event to one of the targeted BSM processes while providing background rejection against both major (ttbar and Wjets) and non-major SM processes. The talk will give an overview of the strategy developed and the status of ongoing optimization studies.