SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 55: Flavor V, Top-BSM

T 55.5: Vortrag

Mittwoch, 22. März 2023, 16:50–17:05, HSZ/0401

Search for flavour-changing neutral current couplings between the top-quark and the Higgs boson in the H → WW / ZZ decay channel with the ATLAS detector at the LHC. — Marvin Geyik, •Oliver Thielmann, and Wolfgang Wagner — Bergische Universität Wuppertal, Germany

A search for flavour-changing neutral current (FCNC) couplings between the top-quark and the Higgs boson in the H → WW / ZZ decay channel in the tri-lepton final state is presented. The search for FCNC couplings in the top-quark-Higgs-boson sector is a promising search for a theory beyond the SM. Proton-proton collision data produced by the LHC at a centre-of-mass energy of √s = 13 TeV and collected by the ATLAS experiment during the years 2015 - 2018, and corresponding to an integrated luminosity of 139fb⁻¹, are used. Data is analysed in different final states, characterised by three isolated electrons or muons, missing transverse energy and the number of jets where exactly one of them is identified as a b-jets. A machine learning analysis based on neural networks is conducted to improve the discrimination between the signal and the backgrounds. Preliminary results, interpreted in the context of an effective field theory for FCNC, are presented, where additional exclusion limits on the qtH effective coupling are derived.