Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Centrality Dependence of the Parton Bubble Model for high energy
  heavy ion collisions and fireball surface substructure at RHIC   In an earlier paper we developed a QCD inspired theoretical parton bubble
model (PBM) for RHIC/LHC. The PBM quantitatively agreed with the strong charged
particle pair correlations observed by the STAR collaboration at RHIC in the
highest energy Au + Au central collisions, and also agreed with the Hanbury
Brown and Twiss (HBT) observed small final state source size approximately 2f
radii in the transverse momentum range above 0.8 GeV/c. The model assumed a
substructure of a ring of localized adjoining 2f radius bubbles(gluonic hot
spots) perpendicular to the collider beam direction, centered on the beam, at
mid-rapidity and located on the expanding fireball surface of the Au + Au
collisions. In this paper we extend the model (PBME) to include the changing
development of bubbles with centrality from the most central region where
bubbles are very important to the most peripheral where the bubbles are gone.
Energy density is found to be related to bubble formation and as centrality
decreases the maximum energy density and bubbles shift from symmetry around the
beam axis to the reaction plane region causing a strong correlation of bubble
formation with elliptic flow. We obtained reasonably quantitative agreement
(within a few percent of the total correlations) with a new precision RHIC
experiment which extended the centrality region investigated to the range 0-80%
(most central to most peripheral). The characteristics and behavior of the
bubbles imply they represent a significant substructure formed on the surface
of the fireball at kinetic freezeout

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The categories of this paper are: eess
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
4
The categories of this paper are: cond-mat
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
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The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph