Resolving the Antibaryon-Production Puzzle in High-Energy Heavy-Ion Collisions

Details Resolving the Antibaryon-Production Puzzle in High-Energy Heavy-Ion Collisions Resolving the Antibaryon-Production Puzzle in High-Energy Heavy-Ion Collisions

2000-08-31

arxiv.org/abs/hep-ph/0008326v3

Phys.Rev.Lett. 86 (2001) 2980-2983

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages ReVTeX incl. 2 eps-figs, minor changes (two figs added, rate eq. written more explicitly), version accepted for public

Scientific paper

10.1103/PhysRevLett.86.2980

We argue that the observed antiproton production in heavy-ion collisions at CERN-SpS energies can be understood if (contrary to most sequential scattering approaches) the backward direction in the process $p\bar p \leftrightarrow \bar{n}\pi$ (with $\bar{n}$=5-6) is consistently accounted for within a thermal framework. Employing the standard picture of subsequent chemical and thermal freezeout, which induces an over-saturation of pion number with associated chemical potentials of $\mu_\pi\simeq$~60-80 MeV, enhances the backward reaction substantially. The resulting rates and corresponding cross sections turn out to be large enough to maintain the abundance of antiprotons at chemical freezeout until the decoupling temperature, in accord with the measured $\bar{p}/p$ ratio in Pb(158AGeV)+Pb collisions.

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