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A search for a standard model Higgs boson produced in association with atop-quark pair and decaying to bottom quarks is presented. Events with hadronicjets and one or two oppositely charged leptons are selected from a data samplecorresponding to an integrated luminosity of 19.5 inverse femtobarns collectedby the CMS experiment at the LHC in pp collisions at a centre-of-mass energy of8 TeV. In order to separate the signal from the larger t t-bar + jetsbackground, this analysis uses a matrix element method that assigns aprobability density value to each reconstructed event under signal orbackground hypotheses. The ratio between the two values is used in a maximumlikelihood fit to extract the signal yield. The results are presented in termsof the measured signal strength modifier, mu, relative to the standard modelprediction for a Higgs boson mass of 125 GeV. The observed (expected) exclusionlimit at a 95% confidence level is mu < 4.2 (3.3), corresponding to a best fitvalue mu-hat = 1.2 +1.6 -1.5.

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