SMuK 2023 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 132: Searches VI
T 132.3: Vortrag
Donnerstag, 23. März 2023, 18:00–18:15, HSZ/0101
Search for new particles decaying to top quark-antiquark pairs at CMS — •Henrik Jabusch1, Ksenia de Leo2, Johannes Haller1, and Roman Kogler3 — 1Institut für Experimentalphysik, Universität Hamburg — 2Università di Trieste & INFN — 3DESY, Hamburg
We present a model-independent search for new particles decaying to top quark-antiquark pairs (tt) using 138 fb−1 of pp collision data at √s=13 TeV recorded with the CMS detector during LHC Run 2. The search targets both resonant and non-resonant signatures in the spectrum of the invariant mass mtt.
Focusing on lepton+jets final states, we use novel top-tagging techniques to identify the hadronic decay of highly Lorentz-boosted top quarks. We further employ a deep neural network for event classification. Reconstructed mtt-distributions are used to derive constraints on various physics models predicting new particles decaying to tt, such as heavy resonances, Kaluza-Klein gluons, heavy Higgs bosons (including interference with the SM process), as well as non-resonant axion-like particles, extending the reach of earlier searches significantly.