Aachen 2019 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
T: Fachverband Teilchenphysik
T 35: Top-Physik I
T 35.6: Vortrag
Dienstag, 26. März 2019, 17:15–17:30, S10
Studies on interference effects in processes with flavor-changing neutral currents and tqγ coupling — •Salvatore La Cagnina1, Maura Barros2, Gregor Gessner1, Ana Peixoto2, Johannes Erdmann1, Nuno Castro2, and Kevin Kröninger1 — 1TU Dortmund, Lehrstuhl für Experimentelle Physik IV — 2Universidade do Minho, Laboratório de Instrumentação e Física Experimental de Partículas
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. Beyond Standard Model theories, however, can allow FCNCs at tree level. One possible process containing an FCNC includes a top quark that interacts with an up-type quark and a photon (tqγ coupling with q=u,c). 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, are distinguished. In next-to-leading order, both modes interfere. This interference might lead to changes of kinematic properties. The effect of scale variation on the kinematic variables is studied at leading order and is used to determine an estimation of the systematic uncertainty on their distributions. It is shown that the influence of interference effects is negligible compared to the uncertainty caused by such scale variations. This conclusion equally applies for distributions of kinematic variations after detector simulation.