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 $\sqrts =$ 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 $\mathrmt\overline\mathrmt$H signal from the irreducible $\mathrmt\overline\mathrmt+\mathrmb\overline\mathrmb$ 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 $\mathrmt\overline\mathrmt$H signal strength relative to the standard model production cross section $\mu=\sigma/\sigma_\mathrmSM$, assuming a Higgs boson mass of 125 GeV. The best fit value is $\hat\mu =$ 0.9 $\pm$ 0.7 (stat) $\pm$ 1.3 (syst) = 0.9 $\pm$ 1.5 (tot), and the observed and expected upper limits are, respectively, $\mu <$ 3.8 and $<$ 3.1 at 95% confidence levels.
Search for tt¯H production in the all-jet final state in proton-proton collisions at sqrt(s)= 13 TeV
Cavallo, N.;Fabozzi, F.;
2018-01-01
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 $\sqrts =$ 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 $\mathrmt\overline\mathrmt$H signal from the irreducible $\mathrmt\overline\mathrmt+\mathrmb\overline\mathrmb$ 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 $\mathrmt\overline\mathrmt$H signal strength relative to the standard model production cross section $\mu=\sigma/\sigma_\mathrmSM$, assuming a Higgs boson mass of 125 GeV. The best fit value is $\hat\mu =$ 0.9 $\pm$ 0.7 (stat) $\pm$ 1.3 (syst) = 0.9 $\pm$ 1.5 (tot), and the observed and expected upper limits are, respectively, $\mu <$ 3.8 and $<$ 3.1 at 95% confidence levels.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.