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Observation of $\mathrm{t\overline{t}}$H production

The CMS collaboration
Phys.Rev.Lett. 120 (2018) 231801, 2018.

The observation of Higgs boson production in association with a top quark-antiquark pair is reported, based on a combined analysis of proton-proton collision data at center-of-mass energies of $\sqrt{s}=$ 7, 8, and 13 TeV, corresponding to integrated luminosities of up to 5.1, 19.7, and 35.9 fb$^{-1}$, respectively. The data were collected with the CMS detector at the CERN LHC. The results of statistically independent searches for Higgs bosons produced in conjunction with a top quark-antiquark pair and decaying to pairs of W bosons, Z bosons, photons, $\tau$ leptons, or bottom quark jets are combined to maximize sensitivity. An excess of events is observed, with a significance of 5.2 standard deviations, over the expectation from the background-only hypothesis. The corresponding expected significance from the standard model for a Higgs boson mass of 125.09 GeV is 4.2 standard deviations. The combined best fit signal strength normalized to the standard model prediction is 1.26 ${^{+0.31}_{-0.26}}$.

  • Table 1

    Figure 2 in the paper.


    Best fit value of the ttH signal strength modifier $\mu_{\mathrm{ttH}}$, with its 1 and 2 standard deviation confidence intervals ($\sigma$),...

  • Table 2

    Table 1 in the paper.


    Best fit value, with its uncertainty, of the ttH signal strength modifier $\mu_{\mathrm{ttH}}$, for the five individual decay channels considered,...

  • Table 3

    Figure 3 in the paper.


    Distribution of events as a function of the decimal logarithm of S/B, where S and B are the expected post-fit...

  • Table 4

    Figure 4 in the paper.


    The test statistic q as a function of $\mu_{\mathrm{ttH}}$ for all decay modes at 7+8 TeV and at 13 TeV,...

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