Abstract
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 13TeV, 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, τ 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 125.09GeV is 4.2 standard deviations. The combined best fit signal strength normalized to the standard model prediction is 1.26_{-0.26}^{+0.31}.
Highlights
The observation of Higgs boson production based on a combined analysis of proton-proton in association with a top quark-antiquark ppaiffirffi collision data at center-of-mass energies of s is 1⁄4
The combined best fit signal strength normalized to the standard model prediction is 1.26−þ00
The 13 TeV data collected so far by the ATLAS [4] and CMS [5] experiments have led to improved constraints on the couplings of the Higgs boson compared to those performed at the lower energies
Summary
The observation of Higgs boson production based on a combined analysis of proton-proton in association with a top quark-antiquark ppaiffirffi collision data at center-of-mass energies of s is 1⁄4. [35] for Higgs boson production cross sections and branching fractions are used to normalize the expected signal yields. Events with combinations of jets and tagged b jets and with two same-sign leptons, three leptons, or four leptons are used to search for ttH production in the H → τþτ−, WWÃ, or ZZÃ decay modes [10,14], where in this case “lepton” refers to an electron, muon, or τh candidate (the asterisk denotes an off-shell particle).
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