SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 55: Flavor V, Top-BSM

T 55.6: Vortrag

Mittwoch, 22. März 2023, 17:05–17:20, HSZ/0401

Search for FCNC couplings between the top quark and the Higgs boson in dilepton same-charge final states — •Marvin Geyik, Oliver Thielmann, and Wolfgang Wagner — University of Wuppertal, Germany

Flavour-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 parametrised 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. This talk focuses on advancements in the dilepton final state and the combination with the trilepton channel. The sensitivity of the analysis in setting limits to relevant coefficients of EFT operators will be presented.