Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 51: Top Physics III (Cross Sections, Entanglement)

T 51.1: Vortrag

Mittwoch, 2. April 2025, 16:15–16:30, VG 1.103

Measurement of the tt cross-section in the lepton+jets channel using pp collision data at √s= 13.6 TeV with the ATLAS experiment — •Noah Scheugenpflug and Andrea Knue — TU Dortmund

In this contribution, the measurement of the top-quark pair production cross-section in the lepton+jets channel for proton-proton collision data at √s = 13.6 TeV is studied. The data was recorded with the ATLAS detector at the LHC in 2022 and corresponds to an integrated luminosity of 29 fb-1. The cross-section is extracted using a profile likelihood fit. The configuration of the fit is validated by performing an Asimov fit. Events with exactly one electron or muon, at least four jets, with one or two of the jets being b-tagged, and missing transverse momentum are selected and divided into three signal regions according to their jet and b-tagged jet multiplicities. For each region, the signal-to-background separation power of a multitude of kinematic variables is studied. A selection of these variables is analyzed with respect to systematic uncertainties. The uncertainty is dominated by the luminosity and the tt signal modelling uncertainty.

Keywords: Crosssection; Top; Run 3