The universal freeze-out criterion at SPS and RHIC
Nuclear Theory
2009-11-07 v1
Abstract
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.
Keywords
Cite
@article{arxiv.nucl-th/0208065,
title = {The universal freeze-out criterion at SPS and RHIC},
author = {Boris Tomasik and Urs Achim Wiedemann},
journal= {arXiv preprint arXiv:nucl-th/0208065},
year = {2009}
}
Comments
proceedings of Quark Matter 2002, 4 pages, 2 figures