Search for the associated production of the Higgs boson with a top- quark pair

Khachatryan, V. and Sirunyan, A. M. and Tumasyan, A. and Adam, W. and Bergauer, T. and Dragicevic, M. and Erö, J. and Fabjan, C. and Friedl, M. and Frühwirth, R. and Ghete, V. M. and Hartl, C. and Hörmann, N. and Hrubec, J. and Jeitler, M. and Kiesenhofer, W. and Knünz, V. and Krammer, M. and Krätschmer, I. and Liko, D. and Mikulec, I. and Rabady, D. and Rahbaran, B. and Rohringer, H. and Schöfbeck, R. and Strauss, J. and Taurok, A. and Treberer-Treberspurg, W. and Waltenberger, W. and Wulz, C.-E. and Filipovic, Nicolas and Bencze, György and Hajdu, Csaba and Hidas, Pál and Horváth, Dezső and Siklér, Ferenc and Veszprémi, Viktor and Vesztergombi, György and Zsigmond, Anna Júlia and Karancsi, János and Molnár, József and Pálinkás, József and Ujvári, Balázs and Veres, Gábor (2014) Search for the associated production of the Higgs boson with a top- quark pair. JOURNAL OF HIGH ENERGY PHYSICS (9). ISSN 1126-6708

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Abstract

A search for the standard model Higgs boson produced in association with a top- quark pair (ttH) is presented, using data samples corresponding to integrated lumi- nosities of up to 5.1 fb−1 and 19.7 fb−1 collected in pp collisions at center-of-mass en- ergies of 7 TeV and 8 TeV respectively. The search is based on the following signatures of the Higgs boson decay: H → hadrons, H → photons, and H → leptons. The results are characterized by an observed ttH signal strength relative to the standard model cross section, μ = σ/σSM, under the assumption that the Higgs boson decays as ex- pected in the standard model. The best fit value is μ = 2.8 ± 1.0 for a Higgs boson mass of 125.6 GeV.

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