Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Mass and Width of the Rho Meson in a Nuclear Medium from Brown-Rho
  Scaling and QCD Sum Rules   We explore the range of values of the in-medium width of a $\rho$-meson at
rest which is compatibale with the QCD sum rule approach in a nuclear medium
assuming vector meson dominance and a Brown-Rho scaling law of the $\rho$-meson
mass with the chiral condensate. The lower and upper bounds for the in-medium
width are found to be strongly increasing with the decreasing mass of the
$\rho$-meson (increasing nuclear density). We also study the bounds for the
in-medium width in models not satisfying the Brown-Rho scaling law. It is shown
that the in-medium width depends on how rapidly the mass decreases in
comparison to the change of the quark condensate. The bounds for the in-medium
width increase with density only if the relative change of the quark condensate
is stronger than the relative decrease in mass. This is important for
experimental tests of the Brown-Rho scaling paradigm and other dropping
$\rho$-mass scenarios.

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The categories of this paper are: solv-int
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The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
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The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
5
The categories of this paper are: gr-qc
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The categories of this paper are: nucl-ex
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The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: chem-ph
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The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga