1 Ocak 2015 Dergi makalesi Açık Erişim

CERN İşbirliği

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    "description": "<p>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 fb-1 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 tt\u00af \u00a0+\u00a0jets 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, \u03bc , relative to the standard model prediction for a Higgs boson mass of 125 GeV . The observed (expected) exclusion limit at a 95\u00a0% confidence level is \u03bc&lt;4.2 (3.3), corresponding to a best fit value \u03bc^=1.2-1.5+1.6 .</p>", 
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