Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 27: Suche nach Physik jenseits des Standardmodels II

T 27.2: Talk

Tuesday, March 20, 2018, 16:45–17:00, Philo-HS4

Search for invisible particles produced in association with a single hadronically decaying top quark at √s = 13 TeV with the ATLAS detector — •Tobias Kupfer, Johannes Erdmann, and Kevin Kröninger — TU Dortmund, Lehrstuhl für Experimentelle Physik IV, Otto-Hahn-Straße 4 a, 44227 Dortmund

The large center of mass energies available in proton-proton collisions at the LHC provide the opportunity to search for new physics phenomena beyond the Standard Model (SM). A vector-like top partner (VLT), which is predicted by many extensions to the SM, as well as resonant and non-resonant production of Dark Matter (DM) particles can lead to a final state including the top quark in addition to particles interacting scarcely or not at all with the detector. This specific signature, referred to as mono-top, is detected by the ATLAS experiment as a single reconstructed top quark in combination with large missing transverse momentum.
An analysis is presented designed to search for singly produced VLT resulting in a hadronically decaying top quark and a Z boson decaying into two neutrinos, which leads to the mono-top signature. The search is performed in a phase-space region optimized on the expected signal sensitivity and limits are set on the predicted mass and coupling of the VLT and of DM particles.