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T: Fachverband Teilchenphysik

T 130: Top II

T 130.2: Talk

Thursday, March 23, 2023, 17:45–18:00, HSZ/0401

Measurement of the inclusive production cross section of a top quark pair with a Z boson in the trileptonic channel — •Steffen Korn, Arnulf Quadt, Baptiste Ravina, and Elizaveta Shabalina — II. Physikalisches Institut - Georg-August-Universität Göttingen

The strength and structure of the coupling of the top quark and the Z boson can be measured through the associated production of a top quark pair and a Z boson. It provides sensitivity to the top quark’s weak isospin in the Standard Model (SM) framework. The measurement of this parameter also serves as a probe of the SM. The process was measured by ATLAS and CMS at √s=13 TeV with the full Run 2 dataset and a partial Run 2 dataset, respectively. In a new, refined analysis, multivariate techniques are used to improve the sensitivity of the measurement. The impact of using a multi-class deep neural network for event classification on the inclusive cross-section of ttZ final states with three charged leptons is presented.