Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Chiral symmetry breaking and chemical equilibrium in a heavy-ion
  collisions   We examine the thermalization of an ensemble of the octet of pseudoscalar
mesons, in the isospin symmetric limit, whose interactions are constrained
through chiral symmetry, unitarity, and measurements. The reaction amplitudes
generate all resonances up to masses of about 2 GeV, with twelve input
parameters, namely f_pi, three masses, and eight low energy constants (LECs) of
chiral perturbation theory. In linear response theory, we find that matter
takes an extremely long time to thermalize. These long relaxation times are
directly related to the fact that these mesons are pseudo-Goldstone bosons of
chiral symmetry breaking. This result indicates that fireballs created with
zero baryon number in heavy-ion collisions will drop out of chemical
equilibrium once they enter the chiral symmetry broken phase.

21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
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The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
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The categories of this paper are: funct-an
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The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs