Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: $\phi$ meson in nuclear matter and nuclei   The mass and decay width of the $\phi$ meson in cold nuclear matter are
computed in an effective Lagrangian approach, with the medium dependence of
these properties obtained by evaluating kaon-antikaon loop contributions to the
$\phi$ self-energy. At normal nuclear matter density, we find a downward shift
of the $\phi$ mass by a few percent, while the decay width is enhanced by an
order of magnitude. We also present $\phi$--nucleus bound state energies and
absorption widths for some selected nuclei, using complex optical potentials
obtained in the local density approximation. Our results suggest that the
$\phi$ should form bound states with all the nuclei considered. However, the
identification of the signal for these predicted bound states will need careful
investigation because of their sizable absorption widths.

37
The categories of this paper are: supr-con
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The categories of this paper are: math
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: econ
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat