Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The gluon plasma at RHIC   Differential elliptic flow and particle spectra are calculated from covariant
Boltzmann transport theory taking into account the finite transport opacity of
the gluon plasma produced in Au+Au at $E_{cm}\sim 130$ $A$ GeV at RHIC. The
solutions are shown to depend mainly on the transport opacity, $\chi=\int dz
\sigma_t\rho_g$. The elliptic flow saturation pattern reported by STAR
indicates that $\chi_{b=0} \sim 25$, i.e., the gluon plasma is $\sim 80$ times
more opaque than the pQCD estimate based on HIJING. Such large opacities are
also consistent with the measured charged hadron spectra.

33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
19
The categories of this paper are: eess
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat
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The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
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The categories of this paper are: adap-org
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph