Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Search for the Standard Model Higgs boson produced in association with
  top quarks and decaying into $b\bar{b}$ in pp collisions at $\sqrt{s}$ = 8
  TeV with the ATLAS detector   A search for the Standard Model Higgs boson produced in association with a
pair of top quarks, $t\bar{t}H$, is presented. The analysis uses 20.3 fb$^{-1}$
of pp collision data at $\sqrt{s}$ = 8 TeV, collected with the ATLAS detector
at the Large Hadron Collider during 2012. The search is designed for the H to
$b\bar{b}$ decay mode and uses events containing one or two electrons or muons.
In order to improve the sensitivity of the search, events are categorised
according to their jet and b-tagged jet multiplicities. A neural network is
used to discriminate between signal and background events, the latter being
dominated by $t\bar{t}$+jets production. In the single-lepton channel,
variables calculated using a matrix element method are included as inputs to
the neural network to improve discrimination of the irreducible
$t\bar{t}$+$b\bar{b}$ background. No significant excess of events above the
background expectation is found and an observed (expected) limit of 3.4 (2.2)
times the Standard Model cross section is obtained at 95% confidence level. The
ratio of the measured $t\bar{t}H$ signal cross section to the Standard Model
expectation is found to be $\mu$ = 1.5 $\pm$ 1.1 assuming a Higgs boson mass of
125 GeV.

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The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
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The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
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The categories of this paper are: patt-sol
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The categories of this paper are: math
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
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The categories of this paper are: stat
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The categories of this paper are: acc-phys
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The categories of this paper are: cmp-lg
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The categories of this paper are: plasm-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: q-alg
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The categories of this paper are: quant-ph