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T: Fachverband Teilchenphysik

T 34: Top-Quarks: Eigenschaften I

T 34.5: Vortrag

Dienstag, 20. März 2018, 17:30–17:45, Z6 - SR 1.002

Studies of interference effects in processes with flavor-changing neutral currents including a tqγ coupling — •Salvatore La Cagnina, Gregor Gessner, Johannes Erdmann, and Kevin Kröninger — TU Dortmund, Experimentelle Physik IV

In the Standard Model, flavor-changing neutral currents (FCNC) are not present at tree level 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 vertex with q=u,c). The production mode, in which a single top quark is produced, is distinguished from the decay mode, in which one of the top quarks of a tt system decays through an FCNC interaction. In next-to-leading order, these both modes could interfere. Searches for processes with FCNCs, for example at the ATLAS experiment at the LHC, rely on several kinematic variables in order to define signal-pure search regions. The distributions of those variables, however, might be influenced by interference effects. Studies investigating these effects and their influence on analyses searching for FCNCs will be presented in this talk.