Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An energy independent scaling of transverse momentum spectra of direct
  (prompt) photons from two-body processes in high-energy proton-proton
  collisions   Transverse momentum spectra of direct (prompt) photons from two-body
processes in high-energy proton-proton (p+p) collisions are analyzed in this
paper. We collected the experimental invariant cross-sections at mid-rapidity
in p+p collisions measured by the UA6, CCOR, R806, R110, PHENIX, NA24, CMS,
ALICE, and ATLAS Collaborations over a center-of-mass energy range from 24.3
GeV to 13 TeV. In fitting the data, we used different kinds of functions which
include the revised Tsallis--Pareto-type function (the TP-like function) at the
particle level, the convolution of two TP-like functions at the quark level,
and the root-sum-of-squares of two revised Tsallis-like functions in which the
quark chemical potentials $\mu _i=\mu_B/3$ or $\mu_i=0$, where $\mu_B$ is the
baryon chemical potential. We have extracted the values of three main free
parameters: the effective temperature $T$, power index $n_0$ (or entropy index
$q$), and correction index $a_0$. After analyzing the changing trends of the
parameters, we found that $T$, $q$, and $a_0$ increase and $n_0$ decreases with
the increase of collision energy. Based on the analyses of transverse momentum
spectra, an energy independent scaling, i.e. the $x_T$ scaling, is obtained.

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The categories of this paper are: stat
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
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The categories of this paper are: acc-phys
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The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
30
The categories of this paper are: q-alg
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The categories of this paper are: alg-geom
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The categories of this paper are: q-fin
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The categories of this paper are: adap-org
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The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th