arXiv:hep-ph/9902342·v1·High Energy Physics — Phenomenology
Universal pion freeze-out phase-space density
D. Ferenc🇩🇪 · U. Heinz🇩🇪 · B. Tomasik🇩🇪 · U.A. Wiedemann🇩🇪 · J.G. Cramer🇺🇸
Abstract
Results on the pion phase-space density at freeze-out in sulphur-nucleus, Pb-Pb and pi-p collisions at the CERN SPS are presented. All heavy-ion reactions are consistent with the thermal Bose-Einstein distribution f=1/[exp(E/T)-1] at T ~ 120 MeV, modified for radial expansion. pi-p data are also consistent with f, but at T ~ 180 MeV and without radial flow.
Comments: 15 pages LaTeX, including 6 postscript figures