Universal pion freeze-out phase-space density

D. Ferenc , U. Heinz , B. Tomasik , U.A. Wiedemann , J.G. Cramer

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classification ✦ hep-ph nucl-th

keywords consistentdensityfreeze-outphase-spacepi-ppionradialbose-einstein

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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.

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Universal pion freeze-out phase-space density

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