Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A unified description of the reaction dynamics from pp to pA to AA
  collisions   There is little doubt that in heavy ion collisions at the LHC and RHIC, we
observe a hydrodynamically expanding system, providing strong evidence for the
formation of a Quark Gluon Plasma (QGP) in the early stage of such collisions.
These observations are mainly based on results on azimuthal anisotropies, but
also on particle spectra of identified particles, perfectly compatible with a
hydrodynamic evolution. Surprisingly, in p-Pb collisions one observes a very
similar behavior, and to some extent even in p-p. We take these experimental
observations as a strong support for a unified approach to describe
proton-proton (p-p), proton-nucleus (p-A), and nucleus-nucleus (A-A)
collisions, with a plasma formation even in tiny systems as in p-p scatterings.

22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
16
The categories of this paper are: stat