Anti-Baryon Puzzle in Ultra-Relativistic Heavy-Ion Collisions

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dc.creatorRapp, R.
dc.creatorShuryak, E. V.
dc.date2002-02-19
dc.date.accessioned2026-07-07T05:38:58Z
dc.date.available2026-07-07T05:38:58Z
dc.descriptionThe 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, $n_ππ\to p\bar p$ (with $n_π$=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.
dc.description10 pages LaTeX including 8 eps-figures, Invited talk by first author at International Workshop XXX on Gross Properties of Nuclei and Nuclear Excitations, Hirschegg (Austria), 13.-19.01.02
dc.identifierhttps://arxiv.org/abs/nucl-th/0202059
dc.identifierhttp://arxiv.org/abs/nucl-th/0202059
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/81805
dc.subjectNuclear Theory
dc.subjectHigh Energy Physics - Phenomenology
dc.titleAnti-Baryon Puzzle in Ultra-Relativistic Heavy-Ion Collisions
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