Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 88: Top Quarks: Production (Exp.) 3

T 88.1: Vortrag

Donnerstag, 24. März 2022, 16:15–16:30, T-H19

Studies of modern generators for top-quark pair-production — •Dominic Hirschbühl, Jens Roggel, and Wolfgang Wagner — Bergische Universität Wuppertal, Deutschland

The precise simulation of tt processes is crucial for precision tests of the Standard Model and in the search for new physics at the Large Hadron Collider. Several important new event generators for the simulation of tt production have been released in the last years. The “bb4ℓ” generator is a NLO matrix-element generator for pp → bbℓ⁺ℓ^−′νν′ final states implemented in the POWHEG-BOX. It includes theoretical improvements in the simulation of tt processes, which allows the production of tt and tW events including interference, off-shell effects, and top-quark decays at NLO. In this talk comparisons of these predictions with unfolded ATLAS data as well as with predictions for different DR and DS models implemented in MG5_aMC@NLO are shown. A second major improvement is the MINNLOPS implementation of the tt process in the POWHEG-BOX, which can be used to generate the tt production at NNLO. Studies of several parameter variations and an optimised setup for the NNLO generator matched with Pythia8 are presented.