TY  - THES
AB  - A search for flavour-changing neutral currents in the top-quark Higgs boson sector is presented, utilizing an integrated luminosity of Lint = 140 fb1 of proton-proton collisions recorded by the ATLAS experiment at a centre-of-mass energy of s = 13 TeV. As flavour-changing neutral currents are highly suppressed in the Standard Model of particle physics, these processes are sensitive to physics beyond the Standard Model. To differentiate between signal and background, advanced reconstruction methods are employed for creating kinematic distributions. Multivariate analysis techniques are utilised to optimize the differentiation between signal and background, leading to expected upper exclusion limits on the branching ratio B (t qH) in a binned profile likelihood fit including a full set of systematic uncertainties. The obtained expected exclusion limits amount to B (t uH) < 4.1 · 104 and B (t cH) < 5.0 · 104 for the branching ratio corresponding to the utH and ctH couplings respectively.
AU  - Thielmann, Oliver
CY  - Wuppertal
DA  - 2023
DO  - 10.25926/BUW/0-167
DP  - Bergische Universität Wuppertal
LA  - eng
N1  - Tag der Verteidigung: 14.12.2023
N1  - Im Titel ist das Wurzelzeichen vor s=13 TeV enthalten
N1  - Gesehen am 08.04.2024
N1  - Bergische Universität Wuppertal, Dissertation, 2023
PB  - Veröffentlichungen der Universität
PY  - Oktober 2023
SP  - 1 Online-Ressource (VII, 188 Seiten)
T2  - Physik
TI  - Search for flavour-changing neutral current interactions in the top-quark Higgs boson sector in multi-lepton final states with the ATLAS detector at the LHC at s = 13 TeV
UR  - https://nbn-resolving.org/urn:nbn:de:hbz:468-2-1690
Y2  - 2024-11-20T18:36:10
ER  -