Search for a standard model Higgs boson produced in association with a top-quark pair and decaying to bottom quarks using a matrix element method

Abstract : A search for a standard model Higgs boson produced in association with a top-quark pair and decaying to bottom quarks is presented. Events with hadronic jets and one or two oppositely charged leptons are selected from a data sample corresponding to an integrated luminosity of 19.5 inverse femtobarns collected by the CMS experiment at the LHC in pp collisions at a centre-of-mass energy of 8 TeV. In order to separate the signal from the larger ttbar+jets background, this analysis uses a matrix element method that assigns a probability density value to each reconstructed event under signal or background hypotheses. The ratio between the two values is used in a maximum likelihood fit to extract the signal yield. The results are presented in terms of the measured signal strength modifier, mu, relative to the standard model prediction for a Higgs boson mass of 125 GeV. The observed (expected) exclusion limit at a 95% confidence level is mu < 4.2 (3.3), corresponding to a best fit value mu-hat = 1.2+1.6-1.5.
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European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2015, 75, pp.251. 〈10.1140/epjc/s10052-015-3454-1〉
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http://hal.in2p3.fr/in2p3-01142848
Contributeur : Sylvie Flores <>
Soumis le : jeudi 16 avril 2015 - 10:18:58
Dernière modification le : jeudi 10 mai 2018 - 02:00:34

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V. Khachatryan, M. Besançon, F. Couderc, M. Dejardin, D. Denegri, et al.. Search for a standard model Higgs boson produced in association with a top-quark pair and decaying to bottom quarks using a matrix element method. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2015, 75, pp.251. 〈10.1140/epjc/s10052-015-3454-1〉. 〈in2p3-01142848〉

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