The effect of "pre-formed" hadron potentials on the dynamics of heavy ion collisions and the HBT puzzle

Details The effect of "pre-formed" hadron potentials on the dynamics of heavy ion collisions and the HBT puzzle The effect of "pre-formed" hadron potentials on the dynamics of heavy ion collisions and the HBT puzzle

2007-09-10

arxiv.org/abs/0709.1409v2

Phys.Lett.B659:525-530,2008

Physics

Nuclear Physics

Nuclear Theory

6 pages, 4 figures. Accepted for publication in Phys. Lett. B

Scientific paper

10.1016/j.physletb.2007.11.080

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.

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