Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Divergence-Free Method to Extract Observables from Meson Correlation
  Functions   Correlation functions provide information on the properties of mesons in
vacuum and of hot nuclear matter. In this Letter, we present a new method to
derive a well-defined spectral representation for correlation functions.
Combining this method with the quark gap equation and the inhomogeneous
Bethe-Salpeter equation in the rainbow-ladder approximation, we calculate
in-vacuum masses of light mesons and the electrical conductivity of the
quark-gluon plasma. The analysis can be extended to other observables of
strong-interaction systems.

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The categories of this paper are: alg-geom
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The categories of this paper are: astro-ph
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The categories of this paper are: cs
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The categories of this paper are: atom-ph
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The categories of this paper are: funct-an
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The categories of this paper are: comp-gas
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The categories of this paper are: cmp-lg
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The categories of this paper are: supr-con
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The categories of this paper are: hep-ex
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The categories of this paper are: stat
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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
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The categories of this paper are: quant-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: eess