Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Jet Multiplicity in Top-Quark Pair Events at CMS   The normalised differential top quark-antiquark production cross section is
measured as a function of the jet multiplicity. Using a procedure to associate
jets to decay products of the top quarks, the differential cross section of the
ttbar production is determined as a function of the additional jet
multiplicity. The fraction of events with no additional jets is measured as a
function of the threshold required for the transverse momentum of the
additional jet. The measurements are compared with predictions from
perturbative quantum chromodynamics and no significant deviations are observed.

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The categories of this paper are: gr-qc
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-ex
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The categories of this paper are: astro-ph
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The categories of this paper are: stat
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The categories of this paper are: chao-dyn
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The categories of this paper are: comp-gas
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The categories of this paper are: math-ph
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The categories of this paper are: q-bio
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The categories of this paper are: physics
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The categories of this paper are: hep-ph
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The categories of this paper are: econ
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The categories of this paper are: patt-sol
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The categories of this paper are: q-fin
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The categories of this paper are: quant-ph
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The categories of this paper are: dg-ga