Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cluster properties from two-particle angular correlations in p+p
  collisions at $\sqrt{s}$ = 200 and 410 GeV   We present results on two-particle angular correlations in proton-proton
collisions at center of mass energies of 200 and 410 GeV. The PHOBOS experiment
at the Relativistic Heavy Ion Collider has a uniquely large coverage for
charged particles, giving the opportunity to explore the correlations at both
short- and long-range scales. At both energies, a complex two-dimensional
correlation structure in $\Delta \eta$ and $\Delta \phi$ is observed. In the
context of an independent cluster model of short-range correlations, the
cluster size and its decay width are extracted from the two-particle
pseudorapidity correlation function and compared with previous measurements in
proton-proton and proton-antiproton collisions, as well as PYTHIA and HIJING
predictions.

16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
2
The categories of this paper are: math