Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two-particle correlations on transverse rapidity in Au+Au collisions at
  $\sqrt{s_{\rm NN}}=200$ GeV at STAR   Two-particle correlation measurements projected onto two-dimensional,
transverse rapidity coordinates ($y_{T1},y_{T2}$), allow access to dynamical
properties of the QCD medium produced in relativistic heavy-ion collisions that
angular correlation measurements are not sensitive to. We report non-identified
charged-particle correlations for Au + Au minimum-bias collisions at
$\sqrt{s_{\rm NN}}$ = 200 GeV taken by the STAR experiment at the Relativistic
Heavy-Ion Collider (RHIC). Correlations are presented as 2D functions of
transverse rapidity for like-sign, unlike-sign and all charged-particle pairs,
as well as for particle pairs whose relative azimuthal angles lie on the
near-side, the away-side, or at all relative azimuth. The correlations are
constructed using charged particles with transverse momentum $p_T \geq 0.15$
GeV/$c$, pseudorapidity from $-$1 to 1, and azimuthal angles from $-\pi$ to
$\pi$. The significant correlation structures that are observed evolve smoothly
with collision centrality. The major correlation features include a saddle
shape plus a broad peak with maximum near $y_T \approx 3$, corresponding to
$p_T \approx$ 1.5 GeV/$c$. The broad peak is observed in both like- and
unlike-sign charge combinations and in near- and away-side relative azimuthal
angles. The all-charge, all-azimuth correlation measurements are compared with
the theoretical predictions of {\sc hijing} and {\sc epos}. The results
indicate that the correlations for peripheral to mid-central collisions can be
approximately described as a superposition of nucleon + nucleon collisions with
minimal effects from the QCD medium. Strong medium effects are indicated in
mid- to most-central collisions.

12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
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The categories of this paper are: stat
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The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
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The categories of this paper are: chem-ph
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
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The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
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The categories of this paper are: nlin
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The categories of this paper are: quant-ph
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The categories of this paper are: econ
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The categories of this paper are: hep-th