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Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 79: Top quark production III

T 79.5: Talk

Thursday, March 18, 2021, 17:00–17:15, Td

Z boson reconstruction in ttZ final states with four charged leptons using deep neural networks at 13 TeV with the ATLAS detectorSteffen Korn, Arnulf Quadt, •Tomke Schröer, Elizaveta Shabalina, and Knut Zoch — II. Physikalisches Institut, Georg-August-Universität Göttingen

The production of a top quark in association with a Z boson gives access to the electroweak coupling between the top quark and the Z boson, which provides sensitivity to the third component of the top-quark’s weak isospin. In the tetralepton channel, the Z boson and both top quarks decay leptonically. This channel is of major interest as it comes with a high signal purity. In this talk, the application of a deep neural network for the reconstruction of the Z boson is presented. The reconstruction includes the correct assignment of the leptons originating from the Z boson and the origin of the Z boson itself. This is an important aspect since it provides access to the tZ system. When the Z boson is emitted by one of the top quarks, the structure and strength of the coupling between the top quark and the Z boson can be probed within the framework of the Standard Model Effective Field Theory (SMEFT). Deviations from the Standard Model (SM) prediction would indicate physics beyond the SM.

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