ttH/tH production at CMS

After the discovery of a Higgs boson, one of the main focuses at the CERN LHC has been to measure its properties. The determination of the associated production of the Higgs boson with a top-antitop quark pair (ttH) is of special interest because it provides a tree-level access to measuring the Higgs--top quark Yukawa coupling. However, the production of a single top quark in association with the Higgs boson (tH) is also sensitive to its sign. This coupling is essential for the stability of the Higgs potential at high energy scales and can also be a probe for physics beyond the standard model (SM). The latest measurements of the ttH and tH associated production rate performed by the CMS Collaboration with proton-proton collision events at 13 TeV in the diphoton and multilepton channels are presented here. Events are categorized according to the lepton and jet multiplicities and multivariate classifiers to distinguish signal from background processes are exploited.The results are all consistent with the SM predictions and feature the first observation of ttH production in a single H decay channel along with the first tests of its CP structure.