Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: What can we learn from a second phi meson peak in ultrarelativistic
  nuclear collisions?   The decay width of a phi meson is reduced from its vacuum value as its mass
decreases in hot hadronic matter as a result of the partial restoration of
chiral symmetry. This reduction is, however, cancelled by collisional
broadening through the reactions $\phi\pi\to KK^*$, $\phi K\to\phi K$,
$\phi\rho\to KK$, and $\phi\phi\to KK$. The resulting phi meson width in hot
hadronic matter is found to be less than about 10 MeV for temperatures below
200 MeV. If hadronic matter has a strong first-order phase transition, this
narrow phi meson with reduced mass will appear as a second peak in the dilepton
spectrum in ultrarelativistic heavy ion collisions. We discuss use of this
second phi peak to determine the transition temperature and the lifetime of the
two-phase coexistence region in the case of a strong first-order phase
transition. We also discuss using the peak to determine the range of
temperatures over which the transition occurs in the case of a smooth but fast
change in the entropy density.

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The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs