Heidelberg 2022 – scientific programme
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T: Fachverband Teilchenphysik
T 60: Top Quarks: Decay and CP Violation and Mixing Angles
T 60.3: Talk
Wednesday, March 23, 2022, 16:45–17:00, T-H19
Search for FCNC-couplings between the top-quark and the Higgs-boson in dilepton final states — •Marvin Geyik1, Wolfgang Wagner1, Oliver Thielmann1, Abhishek Sharma2, Frederic Deliot3, Charles Grant4, Paul Jackson4, Peter Onyisi5, Kyungeon Choi5, and Marc Tost5 — 1Bergische Universität Wuppertal — 2Columbia University — 3Universite Paris-Saclay — 4University of Adelaide — 5University of Texas at Austin
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. This talk focuses on advancements in the dilepton final state. The sensitivity of the analysis in setting limits to relevant coefficients of EFT operators will be presented.