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T: Fachverband Teilchenphysik

T 46: Top Physics II

T 46.2: Vortrag

Mittwoch, 18. März 2026, 16:30–16:45, KH 00.011

Investigating systematic uncertainties in the search for single-top s-channel production — •Alfredo Manente and Andrea Knue — TU Dortmund, Otto-Hahn Str. 4a, 44227 Dortmund

An analysis of single top-quark production in the s-channel at a centre-of-mass energy of 13 TeV will be presented, using simulated proton--proton collision data corresponding to the Run 2 dataset recorded by the ATLAS detector at the Large Hadron Collider. The single top quark s-channel production mode is characterised by a relatively small production cross section and large backgrounds. To enhance the separation between signal and background processes, a Deep Neural Network (DNN) classifier is employed and used as the discriminant in a binned profile likelihood fit. The analysis focuses on the leptonic decay mode of the top quark, resulting in a final state consisting of one charged lepton, missing transverse momentum and two b-tagged jets. The signal strength of the single top-quark s-channel process is measured using an Asimov dataset and a detailed investigation of the statistical and systematic uncertainties will be shown.

Keywords: Top; cross-section; single top; systematic uncertainties