Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 106: Top quarks: Single top production

T 106.3: Talk

Friday, April 3, 2020, 11:30–11:45, L-4.001

Measurement of the Single-Top production cross section in the s-channel at √s=13 TeV with the ATLAS detector — •Ken Kreul for the ATLAS collaboration — Humboldt-Universität zu Berlin

The production of single top-quarks in electroweak processes (Single-Top) is an important part for the study of the Standard Model and possible extensions. Single-Top production is possible in three channels: t-channel, s-channel and via associated production of a W-boson. In proton-proton collisions at the Large Hadron Collider (LHC), the s-channel has the lowest production cross section and is dominated by many background processes. During the LHC run at 8 TeV, the s-channel was already observed with a significance of 3.2σ using the Matrix Element Method. In this method, the matrix elements for the most important signal and background processes are integrated over the available phase space to compute process likelihoods, which can then be combined to a discriminant. The method is now applied to current ATLAS data at √s=13 TeV to improve the previous result using the higher luminosity of up to 140 fb⁻¹.