The universal freeze-out criterion at SPS and RHIC

Details The universal freeze-out criterion at SPS and RHIC The universal freeze-out criterion at SPS and RHIC

2002-08-29

arxiv.org/abs/nucl-th/0208065v1

Nucl.Phys. A715 (2003) 645-648

Physics

Nuclear Physics

Nuclear Theory

proceedings of Quark Matter 2002, 4 pages, 2 figures

Scientific paper

10.1016/S0375-9474(02)01552-X

We formulate a freeze-out criterion for ultra-relativistic heavy ion collisions in terms of the pion escape probability from the collision region. We find that the increase in pion phase-space density from SPS to RHIC reported at this conference has a small influence on particle freeze-out because of the small pi-pi cross-section. Our treatment takes into account dynamical expansion, chemical composition and momentum of the escaping particle for particle freeze-out. It supports a freeze-out at rather low temperature - below 100 MeV - and earlier decoupling of high p_t particles.

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