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T: Fachverband Teilchenphysik
T 106: Top quarks: Single top production
T 106.6: Vortrag
Freitag, 3. April 2020, 12:15–12:30, L-4.001
Search for flavour-changing neutral currents in single-top quark processes in association with a photon at √s = 13 TeV with the ATLAS experiment — Johannes Erdmann, Gregor Gessner, •Benedikt Gocke, and Olaf Nackenhorst — TU Dortmund, Lehrstuhl für Experimentelle Physik IV
In the Standard Model, flavor-changing neutral currents (FCNC) at tree level are forbidden and are highly suppressed by the GIM mechanism at higher orders. However, extensions to the Standard Model predict higher cross sections for processes including FCNCs.
One possible process with an FCNC includes a top quark that interacts with an up-type quark and a photon (tqγ coupling with q=u,c). A distinction is made between the production mode, in which a single top quark is produced, and the decay mode, in which one of the top quarks of a tt system decays through an FCNC interaction.
A search with focus on the production process, which used 81 fb−1 of proton-proton collision data, was recently published (Phys. Lett. B 800 (2019) 135082). Now, first studies of the search for both processes, decay and production mode, using the full LHC Run-2 data are presented.