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T: Fachverband Teilchenphysik

T 10: Top quarks: pair production and tagging

T 10.1: Vortrag

Montag, 30. März 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 experimentBaida Achkar1, Tomas Dado1,2, Kevin Moor1, •Marcel Niemeyer1, Arnulf Quadt1, and Elizaveta Shabalina11II. 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.

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DPG-Physik > DPG-Verhandlungen > 2020 > Bonn