Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Critical fluctuations of the proton density in A+A collisions at $158A$
  GeV   We look for fluctuations expected for the QCD critical point using an
intermittency analysis in the transverse momentum phase space of protons
produced around midrapidity in the 12.5\% most central C+C, Si+Si and Pb+Pb
collisions at the maximum SPS energy of 158$A$~GeV. We find evidence of
power-law fluctuations for the Si+Si data. The fitted power-law exponent
$\phi_{2} = 0.96^{+0.38}_{-0.25}\text{ (stat.)}$ $\pm 0.16\text{ (syst.)}$ is
consistent with the va\-lue expected for critical fluctuations. Power-law
fluctuations had previously also been observed in low-mass $\pi^+ \pi^-$ pairs
in the same Si+Si collisions.

23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
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The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs