Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The effect of "pre-formed" hadron potentials on the dynamics of heavy
  ion collisions and the HBT puzzle   The nuclear stopping, the elliptic flow, and the HBT interferometry are
calculated by the UrQMD transport model, in which potentials for "pre-formed"
particles (string fragments) from color fluxtube fragmentation as well as for
confined particles are considered. This description provides stronger pressure
at the early stage and describes these observables better than the default
cascade mode (where the "pre-formed" particles from string fragmentation are
treated to be free-streaming). It should be stressed that the inclusion of
potential interactions pushes down the calculated HBT radius $R_O$ and pulls up
the $R_S$ so that the HBT time-related puzzle disappears throughout the
energies from AGS, SPS, to RHIC.

37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio