Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 52: Top quark decay and top properties II

T 52.7: Talk

Wednesday, March 17, 2021, 17:30–17:45, Tb

Search for FCNC-couplings between the top-quark and the Higgs-boson in multilepton final states — •Marvin Geyik, Oliver Thielmann, and Wolfgang Wagner — Bergische Universität Wuppertal

Flavor-changing neutral current interactions are strongly suppressed in the Standard Model. Still, some extensions of the Standard Model predict tree-level FCNC-couplings between the top quark, other up-type quarks and neutral bosons, including the Higgs boson. These anomalous couplings can be parameterised in the framework of effective field theories (EFT). The presented analysis searches for the production of a single top-quark in association with a Higgs boson and for top-quark-antiquark production with one of the top quarks decaying to an up quark or a charm quark and a Higgs boson. Higgs decays to WW*, ZZ* and two taus leading to leptonic final states are considered in the event selection. Two analysis channels are defined: one with two leptons (electrons or muons) of the same electric charge and a second channel with three leptons. The sensitivity of the analysis in setting limits to relevant coefficients of EFT operators will be presented.