  The top quark and the Higgs boson play a special role in the fundamental
interactions of the standard model. The observation of the top quark pair
production in association with the Higgs boson establishes the first direct
measurement of the tree-level coupling of the Higgs boson to the top quark. The
analysis of the data collected by the CMS detector results in the overall
observed significance of 5.2 standard deviations for this process.
