Speaker
Description
The Higgs boson production in association with a top quark-antiquark pair signal was firstly observed in 2018 with a significance of 5.2 standard deviations using proton-proton collisions recorded at center-of-mass energy of 13 TeV by the CMS experiment at the CERN LHC. In the final states containing electrons, muons or tau leptons decaying to hadrons and a neutrino the signal of 4.7 sigma significance is measured using the full LHC Run 2 data. No significant fractional CP-odd contributions, parameterized by the quantity |f^{Htt}{CP}| are observed; the parameter is determined to be |f^{Htt}{CP}| = 0.59 with an interval of (0.24, 0.81) at 68% confidence level. The further studies of differential signal distributions are ongoing.
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