Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 10: Top quarks: pair production and tagging

T 10.1: Talk

Monday, March 30, 2020, 16:30–16:45, H-HS XI

Measurement of the tt production cross-section in the lepton+jets channel at √s=13 TeV with the ATLAS experiment — Baida Achkar¹, Tomas Dado^1,2, Kevin Moor¹, •Marcel Niemeyer¹, Arnulf Quadt¹, and Elizaveta Shabalina¹ — ¹II. Physikalisches Institut, Georg-August-Universität Göttingen — ²Institute of Physics, Comenius University Bratislava

The top quark, as it is the heaviest of all quarks, plays a special role in the Standard Model (SM). Measuring its production cross-section provides an important test of QCD calculations and for SM predictions. A previous measurement of the tt production cross-section in the lepton+jets channel with ATLAS was based on a small dataset of 28 pb⁻¹. This talk will present the latest measurement of the tt production cross-section at √s=13 TeV in the lepton+jets channel with the ATLAS experiment based on the full Run II dataset corresponding to 139 fb⁻¹. A profile likelihood fit is used to determine the cross-section in three signal regions simultaneously and constrain the uncertainties significantly.