Non-equilibrated post-freeze-out distributions

We discuss freeze-out on the hypersurface with time-like normal vector, trying to answer how realistic it is to assume thermal post-freeze-out distributions for measured hadrons. Using simple kinetic models for gradual freeze-out we are able to generate a thermal post-FO distribution, but only in a...

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Bibliographic Details
Published in:The European physical journal. C, Particles and fields Particles and fields, 2003-09, Vol.30 (2), p.255-261
Main Authors: Magas, V. K., Anderlik, A., Anderlik, Cs, Csernai, L. P.
Format: Article
Language:English
Subjects:
Distribution functions
Hadrons
Hyperspaces
Pions
Qualitative analysis
Thermalization (energy absorption)
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Summary:We discuss freeze-out on the hypersurface with time-like normal vector, trying to answer how realistic it is to assume thermal post-freeze-out distributions for measured hadrons. Using simple kinetic models for gradual freeze-out we are able to generate a thermal post-FO distribution, but only in a highly simplified situation. In a more advanced model, taking into account rescattering and re-thermalization, the post-FO distribution gets more complicated. The resulting particle distributions are in qualitative agreement with the experimentally measured pion spectra. Our study also shows that the obtained post-FO distribution functions, although analytically very different from the Jüttner distribution, do look pretty much like thermal distributions in some range of the parameters.
ISSN:1434-6044
1434-6052
DOI:10.1140/epjc/s2003-01266-5