Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 101: BSM Higgs 4

T 101.7: Talk

Thursday, March 7, 2024, 17:30–17:45, Geb. 30.41: HS 3

Search for flavour-changing neutral current couplings between the top quark and the Higgs boson in multilepton final states — •Marvin Emin Geyik and Wolfgang Wagner — University of Wuppertal

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. The results obtained by the analysis will be presented in the form of upper exclusion limits on the relevant coefficients of EFT operators and the ensuing branching ratios.

Keywords: FCNC; Top quark; Higgs boson; Multilepton; EFT