Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Long-range correlations in proton-lead collisions at sqrt{s_NN} = 5.02
  TeV from ATLAS   Two-particle correlations in relative azimuth $\Delta\phi$ and relative
pseudorapidity $\Delta\eta$ are studied in p+Pb collisions at sqrt{s_NN}=5.02
TeV with the ATLAS detector at LHC. The correlations are studied as a function
of charged particle pT and the collision E_T^fcal summed over 3.1 < eta < 4.9
in the direction of the Pb beam. After subtracting the known sources of
correlations such as dijets, resonances and momentum conservation, estimated
using events with low E_T^fcal, the resulting correlations exhibit a
$\Delta\phi$ modulation that is flat in $\Delta\eta$ out to $|\Delta\eta|=5$.
The modulation is comparable in magnitude to similar modulations observed in
heavy ion collisions, and can be described by a
$1+2c_2\cos2\Delta\phi+2c_3\cos3\Delta\phi$ function over 0.5<pT<7 GeV in broad
ranges of E_T^fcal. The correlation analysis is repeated for event classes
defined by the number of reconstructed charged particles N_ch^rec. This
analysis gives nearly the same result as the analysis based on E_T^fcal for the
long-range correlation at the near-side ($\Delta\phi~0$), but leads to biases
in the long-range correlations at the away-side ($\Delta\phi\sim\pi$). HIJING
simulation suggests that this bias is mainly associated with the contributions
from dijets which are correlated strongly with the N_ch^rec.

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The categories of this paper are: adap-org
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The categories of this paper are: dg-ga
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The categories of this paper are: eess
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The categories of this paper are: acc-phys
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The categories of this paper are: bayes-an
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The categories of this paper are: stat
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The categories of this paper are: cs
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The categories of this paper are: econ
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-fin
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The categories of this paper are: physics
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The categories of this paper are: q-alg
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: patt-sol