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T: Fachverband Teilchenphysik

T 103: Top physics 4 (tt+X)

T 103.5: Vortrag

Donnerstag, 7. März 2024, 17:00–17:15, Geb. 30.95: Audimax

joint ttZ and tZq measurement — Steffen Korn, •Sebastian Preuth, Arnulf Quadt, Baptiste Ravina, and Elizaveta Shabalina — II. Physikalisches Institut, Georg-August-Universität Göttingen, Göttingen, Germany

Single top (tZq) and top pair production (ttZ) in association with a Z boson are important channels for studying the electroweak sector and potential deviations from Standard Model predictions. The two signals are measured jointly in the reprocessed Run 2 dataset, using an analysis model compatible with a future Run 3 measurement. The dataset, corresponding to a centre-of-mass energy of 13 TeV and an integrated luminosity of 140 fb⁻¹, is used to extract the ttZ and tZq production cross sections and set constraints on the top-Z couplings. The analysis targets final states with three leptons and additional b-jets. To improve the background estimation, which is dominated by diboson production, neural networks are used.

Keywords: ATLAS; top quark; joint measurement; ttZ; tZq