SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 107: Searches – Neutrino at accelerators

T 107.2: Vortrag

Donnerstag, 23. März 2023, 16:05–16:20, HSZ/0101

Search for new physics in tt+E_T^miss final states in pp collisions at 13 TeV with the ATLAS experiment — •Simran Gurdasani, Daniele Zanzi, and Christian Weiser for the ATLAS collaboration — Albert-Ludwigs-Universität Freiburg

This talk will present the recent 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). The search is performed on proton-proton collision data at √s = 13 TeV collected by the ATLAS experiment during the LHC Run 2, corresponding to a luminosity of 139 fb⁻¹. Targeted signatures include Dark Matter production via scalar or pseudo-scalar mediators and SUSY stop pair production. A machine learning approach via Neural Networks (NN) is used in two stages of the search (i) to reconstruct the hadronic decays of top quarks and (ii) to discriminate signal events from background events exploiting information on the full event kinematics. The presence of signal events is inferred via a template fit to the distributions of the NN output values in samples of events at different kinematic phase spaces. This talk will give an overview of the machine learning strategy developed, background modeling techniques and the expected sensitivity estimates.