Speaker
Description
The search for associated production of Higgs bosons and top quark-antiquark pairs is reported, based on a dataset of 35.9 fb$^-1$ collected by the CMS experiment in 2016 in proton-proton collisions at a center-of-mass energy of $\sqrt(s)$ = 13 TeV at the CERN LHC. The search expoits statistically independent analysis targeting different Higgs boson and top quark-anitquark pair decay modes, employing final states with leptons, photons, jets and hadronically decaying $\tau$ leptons. The results from this search are combined with the dataset collected in 2011 and 2012 in proton-proton collisions at a center-of-mass energy of sqrt(s) = 7 and 8~TeV. An excess of events is observed, with a significance of 5.2 standard deviations over the background-only hypotesis, where the corresponding expected significace for a standard model Higgs boson of 125.09 GeV of mass is 4.2 standard deviations. The combined best fit signal strength normalized to the standard model prediction is 1.26$^{+0.31}_{-0.26}$.
