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Search for a standard model Higgs boson produced in association with a top-quark pair and decaying to bottom quarks using a matrix element methodKhachatryan, V.Sirunyan, A.M.Tumasyan, A.Adam, W.Bergauer, T.Dragicevic, M.Erö, J.Friedl, M.Frühwirth, R.Ghete, V.M.Hartl, C.Hörmann, N.Hrubec, J.Jeitler, M.Kiesenhofer, W.Knünz, V.Krammer, M.Krätschmer, I.Liko, D.Mikulec, I.Rabady, D.Rahbaran, B.Rohringer, H.Schöfbeck, R.Strauss, J.Treberer-Treberspurg, W.Waltenberger, W.Wulz, C.-E.Mossolov, V.Shumeiko, N.Suarez Gonzalez, J.Alderweireldt, S.Bansal, S.Cornelis, T.De Wolf, E.A.Janssen, X.Knutsson, A.Lauwers, J.Luyckx, S.Ochesanu, S.Rougny, R.Van De Klundert, M.Van Haevermaet, H.Van Mechelen, P.Van Remortel, N.Van Spilbeeck, A.Blekman, F.Blyweert, S.D’hondt, J.Daci, N.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 19.5fb-1 collected by the CMS experiment at the LHC in pp collisions at a centre-of-mass energy of 8TeV. In order to separate the signal from the larger tt¯  + 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, μ, relative to the standard model prediction for a Higgs boson mass of 125GeV. The observed (expected) exclusion limit at a 95 % confidence level is μ<4.2 (3.3), corresponding to a best fit value (Formula presented.). © 2015, CERN for the benefit of the CMS collaboration.Institute for Ionics2015Articlehttps://rdlopen.rawdatalibrary.net/r/ebyu/15472https://doi.org/10.1140/epjc/s10052-015-3454-11434-6044enEuropean Physical Journal Cinfo:eu-repo/semantics/openAccessinfo:eu-repo/semantics/articlehttps://ebyu-rdlopen.rawdatalibrary.net/tr/items/ebyu/15472