Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Azimuthal harmonics in small and large collision systems at RHIC top
  energies   The first ($v_1^{\text{even}}$), second ($v_2$) and third ($v_3$) harmonic
coefficients of the azimuthal particle distribution at mid-rapidity, are
extracted for charged hadrons and studied as a function of transverse momentum
($p_T$) and mean charged particle multiplicity density $\langle \mathrm{N_{ch}}
\rangle$ in U+U ($\roots =193$~GeV), Au+Au, Cu+Au, Cu+Cu, $d$+Au and $p$+Au
collisions at $\roots = 200$~GeV with the STAR Detector. For the same $\langle
\mathrm{N_{ch}} \rangle$, the $v_1^{\text{even}}$ and $v_3$ coefficients are
observed to be independent of collision system, while $v_2$ exhibits such a
scaling only when normalized by the initial-state eccentricity
($\varepsilon_2$). The data also show that $\ln(v_2/\varepsilon_2)$ scales
linearly with $\langle \mathrm{N_{ch}} \rangle^{-1/3}$. These measurements
provide insight into initial-geometry fluctuations and the role of viscous
hydrodynamic attenuation on $v_n$ from small to large collision systems.

10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci