Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Long-range angular correlations of $\rm \pi$, K and p in p-Pb collisions
  at $\sqrt{s_{\rm NN}}$ = 5.02 TeV   Angular correlations between unidentified charged trigger particles and
various species of charged associated particles (unidentified particles, pions,
kaons, protons and antiprotons) are measured by the ALICE detector in p-Pb
collisions at a nucleon-nucleon centre-of-mass energy of 5.02 TeV in the
transverse-momentum range $0.3 < p_{\rm T} < 4$ GeV/$c$. The correlations
expressed as associated yield per trigger particle are obtained in the
pseudorapidity range $|\eta_{\rm lab}|<0.8$. Fourier coefficients are extracted
from the long-range correlations projected onto the azimuthal angle difference
and studied as a function of $p_{\rm T}$ and in intervals of event
multiplicity. In high-multiplicity events, the second-order coefficient for
protons, $v_2^p$, is observed to be smaller than that for pions, $v_2^\pi$, up
to about $p_{\rm T} = 2$ GeV/$c$. To reduce correlations due to jets, the
per-trigger yield measured in low-multiplicity events is subtracted from that
in high-multiplicity events. A two-ridge structure is obtained for all particle
species. The Fourier decomposition of this structure shows that the
second-order coefficients for pions and kaons are similar. The $v_2^p$ is found
to be smaller at low $p_{\rm T}$ and larger at higher $p_{\rm T}$ than
$v_2^pi$, with a crossing occurring at about 2 GeV. This is qualitatively
similar to the elliptic-flow pattern observed in heavy-ion collisions. A mass
ordering effect at low transverse momenta is consistent with expectations from
hydrodynamic model calculations assuming a collectively expanding system.

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The categories of this paper are: adap-org
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The categories of this paper are: atom-ph
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The categories of this paper are: math-ph
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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: plasm-ph
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The categories of this paper are: supr-con
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The categories of this paper are: dg-ga
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The categories of this paper are: chem-ph
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The categories of this paper are: stat
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The categories of this paper are: hep-th
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The categories of this paper are: quant-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: acc-phys
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The categories of this paper are: alg-geom
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The categories of this paper are: chao-dyn