Strangeness and thresholds of phase changes in relativistic heavy ion collisions

Johann Rafelski, Jean Letessier

Research output: Contribution to journalArticle

Abstract

We discuss how the dynamics of the evolving hot fireball of quark-gluon matter impacts phase transition between the deconfined and confined state of matter. The rapid expansion of the fireball of deconfined matter created in heavy ion collisions facilitates formation of an over-saturated strange quark phase space. The related excess abundance of strangeness is compensating the suppression of this semi-heavy quark yield by its quark mass. In addition, the dynamical expansion of colored quanta pushes against the vacuum structure, with a resulting supercooling of the transition temperature. We address the status of the search for the phase boundary as function of reaction energy and collision centrality and show evidence for a change in reaction mechanism at sufficiently low energies. The phase diagram derived from the study of hadron production conditions shows two boundaries, one corresponding to the expected transition between confined and deconfined matter, with a downward temperature shift, and the other a high quark density hadronization which appears to involve heavy effective quarks, at relatively large temperatures.

Original languageEnglish (US)
Pages (from-to)200-209
Number of pages10
JournalNuclear Physics B (Proceedings Supplements)
Volume161
Issue numberSPEC. ISS.
DOIs
StatePublished - Nov 2006

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strangeness
ionic collisions
quarks
thresholds
fireballs
expansion
supercooling
transition temperature
phase diagrams
retarding
vacuum
collisions
temperature
energy
shift

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Strangeness and thresholds of phase changes in relativistic heavy ion collisions. / Rafelski, Johann; Letessier, Jean.

In: Nuclear Physics B (Proceedings Supplements), Vol. 161, No. SPEC. ISS., 11.2006, p. 200-209.

Research output: Contribution to journalArticle

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