Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Spectral Function of the Rho Meson in Nuclear Matter   We calculate the modification of a rho meson in nuclear matter through its
coupling to resonance-hole states. Starting from a recently proposed model, we
include all four star resonances up to 1.9 GeV. In contrast to previous works,
we include not only resonances that couple to the rho in a relative p-wave, but
also those that couple to an s-wave state. In addition, we solve the equation
for the rho spectral function self-consistently. We find that s-wave resonances
affect the in medium spectral function of the rho strongly. In the transverse
channel the rho meson is, especially at non zero momentum, completely washed
out and can in the presence of nuclear matter no longer be viewed as a resonant
excitation of the vacuum. Instead, our model shows a continuum of possible
excitations with the quantum numbers of a transversely polarized rho. In the
longitudinal channel, however, the rho retains its resonant character in our
calculation. As a consequence of the self-consistent treatment we also find a
strong enhancement of the widths of the included nucleon resonances in medium.

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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: supr-con
27
The categories of this paper are: comp-gas
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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: q-fin
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The categories of this paper are: patt-sol
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: acc-phys
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The categories of this paper are: stat
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The categories of this paper are: q-alg
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The categories of this paper are: hep-th
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The categories of this paper are: physics