Abstract: A search is presented for the associated production of a Higgs boson with a top quark pair in the all-jet ?nal state. Events containing seven or more jets are selected from a sample of proton-proton collisions at ?s = 13TeV collected with the CMS detector at the LHC in 2016, corresponding to an integrated luminosity of 35.9fb?1. To separate the t¯tH signal from the irreducible t¯t + b¯b background, the analysis assigns leading order matrix element signal and background probability densities to each event. A likelihoodratio statistic based on these probability densities is used to extract the signal. The results are provided in terms of an observed t¯tH signal strength relative to the standard model production cross section µ = ?/?SM, assuming a Higgs boson mass of 125GeV. The best ?t value is ? µ = 0.9±0.7(stat)±1.3(syst) = 0.9±1.5(tot), and the observed and expected upper limits are, respectively, µ < 3.8 and < 3.1 at 95% con?dence levels.

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