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Do chemically saturated antihyperon abundancies signal the quark gluon plasma?

Do chemically saturated antihyperon abundancies signal the quark gluon plasma? We first review the production and the possible chemical equilibration of strange particles at CERN-SPS energies within a microscopic hadronic transport calculation. It is shown in particular that the strange quarks are produced initially via string excitations in the primary, secondary and ternary interactions. We then further elaborate on a recent idea of antihyperon production by multi-mesonic reactions like $$n_1 \pi + n_2 K \to \bar Y + p$$ corresponding to the inverse of the strong binary baryon-antibaryon annihilation process. It is argued that by these reactions the (rare) antihyperons are driven towards local chemical equilibrium with pions, nucleons and kaons on a timescale of 1–3 fm/c in the still moderately baryon-dense initial hadronic environment after the termination of the prehadronic string phase. Accordingly this mechanism can provide a convenient explanation for the antihyperon yields at CERN-SPS energies without any need of a deconfined quark gluon plasma phase. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Acta Physica Hungarica Series A, Heavy Ion Physics Springer Journals

Do chemically saturated antihyperon abundancies signal the quark gluon plasma?

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Publisher
Springer Journals
Copyright
Copyright © 2001 by Akadémiai Kiadó
Subject
Physics; Nuclear Physics, Heavy Ions, Hadrons
ISSN
1219-7580
eISSN
1588-2675
DOI
10.1556/APH.14.2001.1-4.15
Publisher site
See Article on Publisher Site

Abstract

We first review the production and the possible chemical equilibration of strange particles at CERN-SPS energies within a microscopic hadronic transport calculation. It is shown in particular that the strange quarks are produced initially via string excitations in the primary, secondary and ternary interactions. We then further elaborate on a recent idea of antihyperon production by multi-mesonic reactions like $$n_1 \pi + n_2 K \to \bar Y + p$$ corresponding to the inverse of the strong binary baryon-antibaryon annihilation process. It is argued that by these reactions the (rare) antihyperons are driven towards local chemical equilibrium with pions, nucleons and kaons on a timescale of 1–3 fm/c in the still moderately baryon-dense initial hadronic environment after the termination of the prehadronic string phase. Accordingly this mechanism can provide a convenient explanation for the antihyperon yields at CERN-SPS energies without any need of a deconfined quark gluon plasma phase.

Journal

Acta Physica Hungarica Series A, Heavy Ion Physics – Springer Journals

Published: Aug 28, 2009

References