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 ttH 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 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 ˆµ = 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.

Sirunyan, A., Tumasyan, A., Adam, W., Ambrogi, F., Asilar, E., Bergauer, T., et al. (2018). Search for tth production in the all-jet final state in proton-proton collisions at √s = 13 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2018(6), 1-45 [10.1007/JHEP06(2018)101].

Search for tth production in the all-jet final state in proton-proton collisions at √s = 13 TeV

Dinardo M. E.;Ghezzi A.;Govoni P.;Paganoni M.;Ragazzi S.;Tabarelli de Fatis T.;Lucchini M. T.;Gerosa R.;Massironi A.;De Guio F.;
2018

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 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 ttH 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 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 ˆµ = 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.
Articolo in rivista - Articolo scientifico
Hadron-Hadron scattering (experiments); Higgs physics; Top physics
English
2018
2018
6
1
45
101
open
Sirunyan, A., Tumasyan, A., Adam, W., Ambrogi, F., Asilar, E., Bergauer, T., et al. (2018). Search for tth production in the all-jet final state in proton-proton collisions at √s = 13 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2018(6), 1-45 [10.1007/JHEP06(2018)101].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/286498
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