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Search for the standard model Higgs boson produced in association with a top-quark pair in pp collisions at the LHC

Abstract: A search for the standard model Higgs boson produced in association with a top-quark pair is presented using data samples corresponding to an integrated luminosity of 5.0 fb?1 (5.1 fb?1 ) collected in pp collisions at the center-of-mass energy of 7 TeV (8 TeV). Events are considered where the top-quark pair decays to either one lepton+jets (tt ? `?qq 0bb) or dileptons (tt ? ` +?`??bb), ` being an electron or a muon. The search is optimized for the decay mode H ? bb. The largest background to the ttH signal is top-quark pair production with additional jets. Artificial neural networks are used to discriminate between signal and background events. Combining the results from the 7 TeV and 8 TeV samples, the observed (expected) limit on the cross section for Higgs boson production in association with top-quark pairs for a Higgs boson mass of 125 GeV is 5.8 (5.2) times the standard model expectation.

Authorship: Chatrchyan S., Khachatryan V., Sirunyan A.M., Tumasyan A., Adam W., Bergauer T., Dragicevic M., Erö J., Fabjan C., Friedl M., Frühwirth R., Ghete V.M., Hörmann N., Hrubec J., Jeitler M., Kiesenhofer W., Knünz V., Krammer M., Krätschmer I., Liko D., Mikulec I., Rabady D., Rahbaran B., Rohringer C., Rohringer H., Schöfbeck R., Strauss J., Taurok A., Treberer-Treberspurg W., Waltenberger W., Wulz C.E., Mossolov V., Shumeiko N., Suare

Fuente: Journal of High Energy Physics, 2013, 5,145

Publisher: Springer Verlag

Publication date: 28/05/2013

No. of pages: 47

Publication type: Article

DOI: 10.1007/JHEP05(2013)145

ISSN: 1126-6708,1029-8479

Publication Url: https://doi.org/10.1007/JHEP05(2013)145

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