Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2002-02-19
Physics
Nuclear Physics
Nuclear Theory
10 pages LaTeX including 8 eps-figures, Invited talk by first author at International Workshop XXX on Gross Properties of Nucl
Scientific paper
The evolution of (non-strange) antibaryon abundances in the hadronic phase of central heavy-ion collisions is studied within a thermal equilibrium framework, based on the well-established picture of subsequent chemical and thermal freezeout. Due to large annihilation cross sections, antiprotons are, a priori, not expected to comply with this scheme. However, we show that a significant regeneration of their abundance occurs upon inclusion of the inverse reaction of multipion fusion, $n_\pi\pi \to p\bar p$ (with $n_\pi$=5-6), necessary to ensure detailed balance. Especially at SPS energies, the build-up of large pion-chemical potentials between chemical and thermal freezeout reinforces this mechanism, rendering the $\bar p/p$ ratio in reasonable agreement with the observed one (reflecting chemical freezeout). Explicit solutions of the pertinent rate equation, which account for chemical off-equilibrium effects, corroborate this explanation.
Rapp Ralf
Shuryak Edward V.
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