Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 47: Higgs 2 (ttH & tH production)

T 47.4: Talk

Tuesday, March 5, 2024, 16:45–17:00, Geb. 30.41: HS 2

Development of ATLAS Run-3 ttW samples — •Matthias Drescher, Arnulf Quadt, and Baptiste Ravina — II. Physikalisches Institut, Georg-August-Universität Göttingen, Germany

The top-quark pair production in association with a W boson (ttW) can be used to understand quark-induced tt production, since ttW does not allow gluons in the initial state at leading order. Furthermore, the ttW process is a major background to other important processes such as ttH and 4t production. To provide the theoretical predictions used to design the analyses of these processes, a set of event data is generated by Monte Carlo event generators.

To be able to analyse the LHC Run 3 data at √s = 13.6 TeV, the existing ttW samples used in the ATLAS collaboration need to be updated. This is done separately for the two existing samples generated with the Sherpa and MadGraph5_aMC@NLO + Pythia 8 generators. In order to better assess the modelling uncertainty in future analyses, auxiliary samples containing variations of the generator parameters are derived from the two nominal configurations as systematic variations. Using the Rivet analysis framework, comparisons are made between different generator versions and between the nominal and systematic samples.

Keywords: ttW; Modelling