Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hard scattering at RHIC: Experimental review   The most significant results on hard scattering processes in Au+Au, p+p, and
d+Au collisions at sqrt(s_NN) = 200 GeV obtained after 3 years of operation at
the BNL Relativistic Heavy-Ion Collider (RHIC) are summarized. Hadron
production at high transverse momentum (p_T) in central Au+Au collisions shows
very different properties (production yields, flavor composition, azimuthal
correlations, ...) in comparison to p+p, d+Au, and peripheral Au+Au collisions,
and this fact constitutes arguably the most interesting outcome of the
experimental program so far. Four main topics are covered in this report: (i)
the depletion of high p_T inclusive hadron spectra, (ii) the ``anomalous''
baryon-meson composition at intermediate p_T's, (iii) the disappearance of
away-side azimuthal (jet) correlations, and (iv) the large value of collective
azimuthal (elliptic flow) correlations. Additionally, the observed high p_T
``Cronin enhancement'' in d+Au collisions will be discussed. A succinct
comparison of experimental data to theoretical models is also provided.

17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc