CMS-PAS-HIG-13-019

CMS-PAS-HIG-13-019
Search for Higgs Boson Production in Association with a Top-Quark Pair and Decaying to Bottom Quarks or Tau Leptons
CMS Collaboration
2013

Abstract: A search for the standard model Higgs boson produced inassociation with a top-quark pair in 19.5 $\mathrm{fb}^{-1}$ of 8 TeV pp collision data is presented. The analysis is optimized for $\mathrm{t}\overline{\mathrm{t}}\mathrm{H}$ events which are categorized into three channels based on the different final states: lepton + jets channel ( $\mathrm{t}\overline{\mathrm{t}} \to \ell\nu \mathrm{q} \overline{\mathrm{q}}^{\prime} \mathrm{b}\overline{\mathrm{b}}$ , $\mathrm{H} \to \mathrm{b}\overline{\mathrm{b}}$ ), dilepton channel ( $\mathrm{t}\overline{\mathrm{t}} \to \ell^{+} \nu \ell^{-} \overline{\nu} \mathrm{b}\overline{\mathrm{b}}$ , $\mathrm{H} \to \mathrm{b}\overline{\mathrm{b}}$ ) and tau channel ( $\mathrm{t}\overline{\mathrm{t}} \to \ell\nu \mathrm{q} \overline{\mathrm{q}}^{\prime}\mathrm{b}\overline{\mathrm{b}}$ , $\mathrm{H} \to \tau^{+}\tau^{-}$ ). The major background to the signal is top-quark pair production with additional jets. Multivariate analysis (MVA) techniques are used to discriminate between background and signal events. A simultaneous fit for signal and background is performed using the MVA output distributions. Assuming standard model Higgs boson branching fractions, a 95 $\%$ C.L. upper limit on the $\mathrm{t}\overline{\mathrm{t}}\mathrm{H}$ production cross section is presented. In addition, the results from this analysis are combined with two earlier $\mathrm{t}\overline{\mathrm{t}}\mathrm{H}$ analyses that use independent datasets.
Links: CDS record (PDF) ; inSPIRE record ; Public twiki page ; CADI line (restricted) ;

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