Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

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

T 88.9: Vortrag

Donnerstag, 24. März 2022, 18:15–18:30, T-H19

Studies on tt+cc/tt+bb separation — •Max Erhart, Ulrich Husemann, Jan van der Linden, Emanuel Pfeffer, and Rufa Rafeek — Institute of Experimental Particle Physics (ETP), Karlsruhe Institute of Technology (KIT)

Bottom jets and charm jets have very similar signatures and their identification techniques (b-tagging, c-tagging) use similar approaches, thus misidentification between these jets is common. Therefore the production of a top quark pair (tt) in association with heavy flavor jets, i.e. charm and bottom (tt+cc, tt+bb), is an important, irreducible background to analyses targeting top quark pairs with additional bottom quark jets such as associated Higgs boson production with a subsequent Higgs boson decay into bottom quarks (tt+H(bb)). The modeling of the additional bottom or charm jets also suffers from large uncertainties in theroetical calculations due to the difference in mass scale for the large top quark mass and the relatively light bottom or charm quarks.

Due to the similarities of these processes a simultaneous measurement of the production cross section for heavy flavor jets in association with top quarks in the dileptonic final state of the top quarks is being conducted at the CMS experiment.

In this talk an overview of the ongoing analysis and the analysis strategies to separate the tt+bb, tt+H(bb), tt+Z(bb) and tt+cc processes from one another is given.