Karlsruhe 2024 – scientific programme
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T: Fachverband Teilchenphysik
T 50: Top physics 2 (top pair cross section)
T 50.9: Talk
Tuesday, March 5, 2024, 18:00–18:15, Geb. 30.95: Audimax
Simulation of on- and off-shell t t production with the MC generator bb4l at CMS — Simone Amoroso1, Alexander Grohsjean2, •Laurids Jeppe1, and Christian Schwanenberger1,2 — 1Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany — 2Universität Hamburg, Hamburg, Germany
Top quark pair production processes at the LHC are important for precision measurements of observables such as the top quark mass or top quark pair spin correlations and as a background for BSM searches. As such, it is crucial that MC simulation of this process is available for experimental analyses at the highest level of precision possible.
Here, we show an investigation of the NLO MC generator bb4l interfaced to Pythia 8 for parton showering. This program not only models top quark pair production, but also single top quark production in association with a W boson, as well as their interference, and correctly takes into account effects from the finite top width. We compare it to simulations using the hvq and ST_wtch generators for different interference handling schemes, as well as the ttb_NLO_dec generator, with possible implications for future top mass measurements.
Keywords: Top; Monte Carlo; bb4l