Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Subtracted Dispersion Relations for In-Medium Meson Correlators in QCD
  Sum Rules   We analyze subtracted dispersion relations for meson correlators at finite
baryon density and temperature. Such relations are needed for QCD sum rules. We
point out the importance of scattering terms, as well as finite, well-defined
subtraction constants. Both are necessary for consistency, in particular for
the equality of the longitudinal and transverse correlators in the limit of the
vanishing three-momentum of mesons relative to the medium. We present detailed
calculations in various mesonic channels for the case of the Fermi gas of
nucleons.

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The categories of this paper are: math
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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: q-fin
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The categories of this paper are: chao-dyn
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The categories of this paper are: stat
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The categories of this paper are: alg-geom
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The categories of this paper are: plasm-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: econ
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The categories of this paper are: funct-an
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The categories of this paper are: bayes-an
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The categories of this paper are: patt-sol
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The categories of this paper are: eess
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The categories of this paper are: nucl-ex
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The categories of this paper are: nlin