Non-equilibrated post freeze out distributions

Details Non-equilibrated post freeze out distributions Non-equilibrated post freeze out distributions

2003-07-03

arxiv.org/abs/nucl-th/0307017v1

Eur.Phys.J.C30:255-261,2003

Physics

Nuclear Physics

Nuclear Theory

14 pages, 2 figures, EPJ style, submitted to EPJ C

Scientific paper

10.1140/epjc/s2003-01266-5

We discuss freeze out on the hypersurface with time-like normal vector, trying to answer how realistic is to assume thermal post freeze out distributions for measured hadrons. Using simple kinetic models for gradual freeze out we are able to generate thermal post FO distribution, but only in 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 Juttner distribution, do look pretty much like thermal distributions in some range of parameters.

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