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T: Fachverband Teilchenphysik

T 61: Search for New Particles III

T 61.4: Vortrag

Mittwoch, 17. März 2021, 16:45–17:00, Tk

A search for pair production of excited top quarks t^* at CMS — •Finn Labe, Paolo Gunnellini, Johannes Haller, Anastasia Karavdina, Roman Kogler, Andrea Malara, and Matthias Schröder — Institut für Experimentalphysik, Universität Hamburg

A search for pair production of excited top quarks t^* in the decay channel t^* t^* → t g t g is presented. The search is performed in the boosted lepton + jets final state using data collected from proton-proton collisions at a center-of-mass energy of 13 TeV during Run-2 of the CMS experiment, corresponding to 137 fb⁻¹ of data. After a preselection, a deep neural network is used for discrimination of signal from background. The network inputs have been decorrelated from the sum of all jet momenta H_T, which is used to set expected exclusion limits. This approach is compared to the usage of the reconstructed t^* mass and yields promising results over the full mass range analyzed.