Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: System Size and Centrality Dependence of the Balance Function in A + A
  Collisions at s(NN)^(1/2) = 17.2 GeV   Electric charge correlations were studied for p+p, C+C, Si+Si and centrality
selected Pb+Pb collisions at $\sqrt{s_{NN}} = 17.2$ GeV with the NA49 large
acceptance detector at the CERN-SPS. In particular, long range pseudo-rapidity
correlations of oppositely charged particles were measured using the Balance
Function method. The width of the Balance Function decreases with increasing
system size and centrality of the reactions. This decrease could be related to
an increasing delay of hadronization in central Pb+Pb collisions.

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The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat