Observation of Higgs boson production in association with a top quark pair at the LHC with the ATLAS detector
Last, but not least, this paper covers the observation of one of the rarest known Higgs production processes known, ttH associated production. This particular process allows to directly probe the interaction of the Higgs boson with the heaviest known particle, the top quark. As the non-standard top quarks often feature prominently in new physics theories, a study of this process is a very powerful probe for new physics. This highly elusive rare process was originally *not* foreseen to be measurable before the start of the high-luminosity LHC.
The fact that it was observed with more than 5 sigma nearly a decade ahead of its time is a testament to the collective ingenuity of the physicists involved. For this paper Nikhef made crucial contributions to the most abundant ttH(bb) channel where the Higgs decays to a pair of b-quarks, as well as to the combination effort.