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Article
Report number	nucl-th/0208065 ; CERN-TH-2002-215 ; CERN-TH-2002-215
Title	The universal freeze-out criterion at SPS and RHIC
Related title	SUPER PROTON SYNCHROTRON RELATIVISTIC HEAVY ION COLLIDER FREEZE OUT
Author(s)	Tomasik, Boris (CERN) ; Wiedemann, Urs Achim (CERN)
Affiliation	(CERN)
Publication	2003
Imprint	29 Aug 2002
Number of pages	4
Note	proceedings of Quark Matter 2002, 4 pages, 2 figures Report-no: CERN-TH/2002-215 Journal-ref: Nucl.Phys.A715 (2003) 645c
In:	Nucl. Phys. A 715 (2003) 645c-648c
In:	16th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions, Nantes, France, 18 - 24 Jul 2002, pp.645c-648c
DOI	10.1016/S0375-9474(02)01552-X
Subject category	Nuclear Physics - Theory
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.
Copyright/License	Elsevier Science B.V.

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