Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Photon radiation from heavy-ion collisions in the $\sqrt{s_{NN}}=19-200$
  GeV regime   We present calculations of prompt and thermal photon production in Au-Au
collisions at $\sqrt{s_{NN}}=19-200$~GeV. We discuss features of the spacetime
profile of the plasma relevant for electromagnetic emission. We highlight how
the suppression of prompt photon production at low $\sqrt{s_{NN}}$ can provide
a window to measure thermal photons in low collision energies.

22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
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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
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an