Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dilepton to photon ratio, a viscometer of QGP   In the Israel-Stewart's 2nd order hydrodynamics, a viscous effect on dilepton
emission from a QGP medium is investigated. Dileptons are strongly affected by
QGP viscosity. Large invariant mass dileptons, due to their lower velocity, are
less affected by viscosity than the low invariant mass dileptons. We also show
that the ratio of photon to dilepton is sensitive to the viscosity and can
serve as a viscometer for QGP.

35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
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The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
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The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph
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The categories of this paper are: econ
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The categories of this paper are: comp-gas
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The categories of this paper are: atom-ph
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The categories of this paper are: nlin
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The categories of this paper are: cmp-lg
3
The categories of this paper are: physics