Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Conservation of particle multiplicities between chemical and thermal
  freeze-out   The evolution of a hadronic system after its chemical decomposition is
described through a model that conserves the hadronic multiplicities to their
values at chemical freeze-out. In the partition function describing the model
all known hadronic resonances with masses up to 2400 MeV have been included.
The state of the system is found as function of temperature and the
corresponding baryon density is evaluated. The baryon density at thermal
decoupling is also computed.

4
The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics