Heidelberg 2022 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 88: Top Quarks: Production (Exp.) 3
T 88.3: Vortrag
Donnerstag, 24. März 2022, 16:45–17:00, T-H19
Modelling tt + jets with the Sherpa fusing approach — •Lars Ferencz1, Judith Katzy1, Frank Siegert2, Stefan Höche3, Chris Pollard4, and Johannes Krause2 — 1DESY, Hamburg, Germany — 2IKTP, Dresden, Germany — 3Fermilab, Chicago, United States — 4University of Oxford, Oxford, United Kingdom
Analyses interested in measuring the production of a top quark pair in association with a Higgs boson decaying into a bb final state rely on the MC modelling or irreducible backgrounds like tt+bb, tt+cc and tt+light jets. Recently MCs with massive b-quarks in the ttbb ME@NLO (so called 4FS) predictions became available and are used for the ttbb related backgrounds. However, in order to predict the background for the analysis, they need to be combined with calculations of tt+cc and tt + light jets taken from a different calculation based on massless quarks (5FS). This talk will present a method for embedding a ttbb 4 FS prediction into a multi-leg tt+jets 5 FS prediction using the Sherpa MC generator. This method is called "Sherpa Fusing". This approach would make it possible to predict the various tt + jets components like tt + light jets, tt + c-jets and tt + b-jets in a single sample, while ensuring the coverage of the full phase space. This talk will introduce the fusing method and present results comparing the fused predictions to standalone tt+ jets and ttbb predictions.