Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Regeneration of Anti-Protons in Ultrarelativistic Heavy-Ion Collisions   The production and annihilation of antiprotons in the hadronic phase of
heavy-ion collisions is evaluated within a thermal equilibrium approach. It is
shown that the inverse reaction of $p\bar p$ annihilation (i.e., multi-pion
annihilation $N_\pi \pi\to p\bar p$ with $N_\pi\simeq$~5-7) in connection with
oversaturation of pion phase space (i.e., finite pion chemical potentials)
plays an important role in understanding the observed antiproton yields at SpS
energies within the standard picture of subsequent chemical and thermal
freezeout. Implications for RHIC energies are also addressed.

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The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
4
The categories of this paper are: cond-mat
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio