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T: Fachverband Teilchenphysik
T 83: Search for new particles IV
T 83.4: Vortrag
Donnerstag, 2. April 2020, 17:15–17:30, L-2.017
Search for new particles in events with 4 top quarks at the ATLAS detector — •Alicia Wongel for the ATLAS collaboration — DESY, Hamburg
A novel search for anomalous production of four-top-quark events is presented. It offers a unique way to probe top-philic resonances (Z′) which can only be produced in association with top quarks (ttZ′ → tttt) and thus cannot be accessed in current searches. Full Run 2 data is used in this analysis. It focuses on one-lepton events, that ensure a high signal acceptance while suppressing multijet process events. Furthermore, the particular configuration where the resonance decays fully hadronically is investigated. A potential signal would manifest itself as a bump over the steeply falling mass spectrum of the two hadronically decaying top quarks (mtt). In this talk, an overview of the analysis strategy is given, including the background estimation techniques and measures taken to improve the mass resolution of the reconstructed resonance.