Heidelberg 2022 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 10: Search for New Particles -1
T 10.4: Vortrag
Montag, 21. März 2022, 17:00–17:15, T-H23
Search for heavy resonances decaying to top quark pairs at CMS — •Ksenia de Leo1, Johannes Haller1, Roman Kogler2, Artur Lobanov1, and Matthias Schröder1 — 1Institut für Experimentalphysik, Universität Hamburg — 2DESY, Hamburg
A search for new heavy resonances decaying to top quark pairs is presented. The analysis uses pp-collision data with a center-of-mass energy of 13 TeV, collected with the CMS experiment during Run-2 of the LHC. The data correspond to an integrated luminosity of 137 fb−1.
The search is performed in final states with one lepton, missing transverse energy and jets, and exploits top-tagging techniques to identify the hadronic decay of top quarks. A multi-class neural network has been developed to categorise the events into the main backgrounds from known standard model processes. Exclusion limits on the production cross section of new particles are set for different benchmark models. While the main target of the analysis is the highest possible mass region, improvements have been implemented to increase the sensitivity for masses below 1 TeV, important for models where a scalar or pseudo-scalar particle decays to top quark pairs.