Karlsruhe 2024 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 103: Top physics 4 (tt+X)

T 103.1: Vortrag

Donnerstag, 7. März 2024, 16:00–16:15, Geb. 30.95: Audimax

Separation of events with three top quarks from events with four top quarks — Steffen Korn, •Sophia Pennuttis, Arnulf Quadt, and Sreelakshmi Sindhu — Georg-August-Universität Göttingen

The production of three top quarks in the Standard Model is only possible in association with a W boson or a quark, making it challenging to separate the process from the four top production process. Both of these processes are sensitive to the top-Higgs Yukawa coupling, the precise measurement of which is important to identify evidence for physics beyond the Standard model (BSM). Furthermore, their cross-sections could be enhanced by various BSM effects, like flavour-changing neutral currents. While the production process of four top quarks has already been observed by ATLAS and CMS, the measurement of the much rarer three top production has not been possible yet. The ability to separate the two processes is a prerequisite to the observation of three top production in a combined measurement. To achieve this, neural networks are trained on various kinematic variables considering final states with two same sign leptons and those with at least three leptons, using the LHC Run2 and Run3 datasets.

Keywords: ATLAS; machine-learning; 4 top quarks; 3 top quarks