Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Photon production from Pb+Pb collisions at {$\sqrt{s_{\rm {NN}}}$} =
  5.02 TeV at LHC and at {$\sqrt{s_{\rm {NN}}}$} = 39 TeV at FCC   We calculate the production of prompt and thermal photons from Pb+Pb
collisions at 5.02A TeV at the Large Hadron Collider (LHC) and at 39A TeV at
the proposed Future Circular Collider (FCC) facility. The photon spectra and
anisotropic flow at these energies are compared with the results obtained from
2.76A TeV Pb+Pb collisions at the LHC for three different centrality bins. The
prompt photons originating from initial hard scatterings are found to increase
by a factor of 1.5 to 2 at 5.02A TeV in the $p_T$ region 2 to 15 GeV and the
enhancement is found to be about 5 to 15 times at FCC energy compared to 2.76A
TeV in the same $p_T$ region. The evolution of the Quark-Gluon Plasma (QGP)
formed in Pb+Pb collisions at LHC and FCC energies are studied using a
hydrodynamical model and the $p_T$ spectra and elliptic flow of thermal photons
are calculated using state-of-the-art photon rates. The relative enhancement in
the production of thermal photons is found to be more compared to prompt
photons at FCC than at the LHC energies. Although the production of direct
(prompt+thermal) photons is found to enhance significantly with increase in
beam energy, the photon elliptic flow increases only marginally and does not
show strong sensitivity to the collision energy.

15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin