Search for t tbar H production in the all-jet final state in proton-proton collisions at sqrt(s) = 13 TeVстатья
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Дата последнего поиска статьи во внешних источниках: 28 сентября 2021 г.
Аннотация: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 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 tt¯H signal from the irreducible tt¯+bb¯¯¯ 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 tt¯H 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 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% confidence levels.