Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurements of differential cross sections of top quark pair production
  in association with jets in ${pp}$ collisions at $\sqrt{s}=13$ TeV using the
  ATLAS detector   Measurements of differential cross sections of top quark pair production in
association with jets by the ATLAS experiment at the LHC are presented. The
measurements are performed as functions of the top quark transverse momentum,
the transverse momentum of the top quark-antitop quark system and the
out-of-plane transverse momentum using data from $pp$ collisions at
$\sqrt{s}=13$ TeV collected by the ATLAS detector at the LHC in 2015 and
corresponding to an integrated luminosity of 3.2 fb$^{-1}$. The top quark pair
events are selected in the lepton (electron or muon) + jets channel. The
measured cross sections, which are compared to several predictions, allow a
detailed study of top quark production.

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The categories of this paper are: quant-ph
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The categories of this paper are: adap-org
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The categories of this paper are: cond-mat
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The categories of this paper are: dg-ga
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The categories of this paper are: math-ph
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The categories of this paper are: econ
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The categories of this paper are: astro-ph
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The categories of this paper are: eess
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The categories of this paper are: patt-sol
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The categories of this paper are: q-bio
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The categories of this paper are: cs
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The categories of this paper are: gr-qc
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
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The categories of this paper are: physics