Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two-pion interferometry for the granular sources in ultrarelativistic
  heavy ion collisions   We investigate the two-pion interferometry in ultrarelativistic heavy ion
collisions in the granular source model of quark-gluon plasma droplets. The
pion transverse momentum spectra and HBT radii of the granular sources agree
well with the experimental data of the $\sqrt{s_{NN}}=200$ GeV Au-Au and
$\sqrt{s_{NN}}=2.76$ TeV Pb-Pb most central collisions. In the granular source
model the larger initial system breakup time may lead to the larger HBT radii
$R_{\rm out}$, $R_{\rm side}$, and $R_{\rm long}$. However, the large droplet
transverse expansion and limited average relative emitting time of particles in
the granular source lead to small ratios of the transverse HBT radii $R_{\rm
out}/R_{\rm side}$.

15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin