Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: NA60 results on the rho spectral function in In-In collisions   The NA60 experiment at the CERN SPS has studied low-mass muon pairs in 158
AGeV In-In collisions. A strong excess of pairs is observed above the yield
expected from neutral meson decays. After subtraction of the decay sources, the
shape of the resulting mass spectrum is largely consistent with a dominant
contribution from pi+pi- -> rho -> mu+mu- annihilation. The associated rho
spectral function exhibits considerable broadening, but essentially no shift in
mass. The acceptance-corrected pT spectra have a shape atypical for radial
flow. They also significantly depend on mass, pointing to different sources in
different mass regions. Both mass and pT spectra are compared to recent
theoretical predictions.

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The categories of this paper are: ao-sci
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-lat
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The categories of this paper are: physics
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The categories of this paper are: cmp-lg
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The categories of this paper are: nlin
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The categories of this paper are: chem-ph
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The categories of this paper are: cs
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The categories of this paper are: q-fin
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The categories of this paper are: solv-int
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-bio
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The categories of this paper are: q-alg
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The categories of this paper are: astro-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: gr-qc