Search for $t\overline tH$ production in the all-jet final state in proton-proton collisions at $\sqrt s$ = 13 TeV

Abstract

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

Abstract

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

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