Search for Higgs Boson Production in Association with a Top-Quark Pair and Decaying to Bottom Quarks or Tau Leptons - INSPIRE

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Search for Higgs Boson Production in Association with a Top-Quark Pair and Decaying to Bottom Quarks or Tau Leptons

CMS

Collaboration

2013

61 pages

Report number:

CMS-PAS-HIG-13-019

Experiments:

CERN-LHC-CMS

View in:

CERN Document Server

reference search66 citations

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Abstract:

A search for the standard model Higgs boson produced in association 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.

Note:

Preliminary results

Data
Higgs particle: branching ratio
Higgs particle: associated production
top: pair production
background
p p: interaction
Higgs particle: decay modes
bottom: pair production
tau: pair production
data analysis method

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