Orateur
Description
The associated production of a top-quark pair with the Higgs boson is one of the few processes allowing to probe the Higgs Yukawa coupling to the top quark in a direct way, providing an important test of EW symmetry breaking.
The ATLAS measurement of ttH in multilepton final states, which uses the full Run 2 dataset of proton-proton collisions at $\sqrt{s}=$13TeV by the ATLAS detector, will be presented. Besides the measurement of the inclusive ttH cross-section, a differential ttH cross-section measurement in bins of the Higgs transverse momentum in the simplified template cross-section framework and a simultaneous fit of tH and ttH are performed. Finally, the CP structure of the top quark-Higgs boson Yukawa coupling is probed through the analysis of ttH and tH events.