Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of the top-quark mass in t t-bar events with lepton+jets
  final states in pp collisions at sqrt(s) = 7 TeV   The mass of the top quark is measured using a sample of t t-bar candidate
events with one electron or muon and at least four jets in the final state,
collected by CMS in pp collisions at sqrt(s) = 7 TeV at the LHC. A total of
5174 candidate events is selected from data corresponding to an integrated
luminosity of 5.0 inverse femtobarns. For each event the mass is reconstructed
from a kinematic fit of the decay products to a t t-bar hypothesis. The
top-quark mass is determined simultaneously with the jet energy scale (JES),
constrained by the known mass of the W boson in q anti-q decays, to be 173.49
+/- 0.43 (stat.+JES) +/- 0.98 (syst.) GeV.

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The categories of this paper are: dg-ga
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The categories of this paper are: cmp-lg
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The categories of this paper are: atom-ph
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The categories of this paper are: econ
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The categories of this paper are: hep-th
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The categories of this paper are: ao-sci
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The categories of this paper are: eess
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The categories of this paper are: math-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: physics
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The categories of this paper are: q-bio
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The categories of this paper are: bayes-an
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The categories of this paper are: plasm-ph
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The categories of this paper are: adap-org
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The categories of this paper are: hep-lat