One of the important tests of the SM is the measurement of
the top quark Yukawa coupling, directly measured via the associated
production process pp→tt̄H. Both ATLAS and CMS have performed
searches of tt̄H targeting the most relevant Higgs decays modes in
final states with high lepton multiplicity, high b-jet multiplicity, or
containing two photons at √s=13 TeV. In this talk, the latest results on
the search for the tt̄H process in the multilepton final state with the
ATLAS experiment will be discussed, together with a detailed study of
one of the main background processes, tt̄W, and an outlook of these
measurements with higher statistics.