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v3.2.5
In the Standard Model (SM) of particle physics, the Higgs boson is deeply related to the mechanism that creates the masses of the elementary particles. A precise measurement of the Higgs boson properties and couplings thus offers a unique probe of this mechanism and plays a crucial role in testing the predictions of the SM or revealing potential new physics.
The coupling of the Higgs boson to the heaviest known quark, the top quark, is particularly exciting, because it is large and, therefore, has a strong impact on the SM or possible new physics. The best direct measurement of this top-Higgs coupling is achieved at the LHC in proton-proton collision events, where a top quark-antiquark pair is produced in association with a Higgs boson (ttH production).
In the presentation, the first observation of the ttH production by the CMS experiment in 2018, which was achieved by combining analyses in several decay channels of the Higgs boson, will be reviewed. Furthermore, an update of the result in the bb decay channel of the Higgs boson will be presented, which establishes evidence for ttH production in this channel alone, and the interplay with the challenging background due to tt+bb production will be discussed. The analysis benefits from a larger dataset, improvements of the CMS detector, as
well as refined analysis methods exploiting advanced machine-learning techniques. Finally, prospects for ttH measurements at the LHC and
beyond will be discussed.