Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of emission angle anisotropy via long-range angular
  correlations with high $p_T$ hadrons in $d$$+$Au and $p$$+$$p$ collisions at
  $\sqrt{s_{_{NN}}}=200$ GeV   We present measurements of two-particle angular correlations between
high-transverse-momentum ($2<p_T<11$ GeV/$c$) $\pi^0$ observed at midrapidity
($|\eta|<0.35$) and particles produced either at forward ($3.1<\eta<3.9$) or
backward ($-3.7<\eta<-3.1$) rapidity in $d$$+$Au and $p$$+$$p$ collisions at
$\sqrt{s_{_{NN}}}=200$ GeV. The azimuthal angle correlations for particle pairs
with this large rapidity gap in the Au-going direction exhibit a ridge-like
structure that persists up to $p_T{\approx}6$ GeV/$c$ and which strongly
depends on collision centrality, which is a similar characteristic to the
hydrodynamical particle flow in A+A collisions. The ridge-like structure is
absent in the $d$-going direction as well as in $p$$+$$p$ collisions, in the
transverse-momentum range studied. The results indicate that the ridge-like
structure is shifted in the Au-going direction toward more central collisions,
similar to the charged-particle pseudorapidity distributions.

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The categories of this paper are: nlin
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The categories of this paper are: nucl-th
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The categories of this paper are: solv-int
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The categories of this paper are: hep-th
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The categories of this paper are: math
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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: astro-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: dg-ga
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The categories of this paper are: atom-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: eess
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The categories of this paper are: q-bio
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The categories of this paper are: chem-ph
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The categories of this paper are: comp-gas