The reconstructed final state of Au + Au collisions from PHENIX and STAR data at √s = 130 AGeV - Indication for quark deconfinement at RHIC

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Abstract

The final state of Au + Au collisions at √s = 130 AGeV at RHIC has been reconstructed within the framework of the Buda-Lund hydrodynamical model, by performing a simultaneous fit to final data on two-particle Bose-Einstein correlations of the STAR and PHENIX Collaborations, and final identified single-particle spectra as measured by the PHENIX Collaboration. The results indicate a strongly three dimensional expansion, with a four-velocity field that is almost a spherically symmetric Hubble flow. We find large transverse geometrical source sizes, RG = 9.8 ± 1.2 fm, relatively short mean freeze-out time, τ0 = 6.1 ± 0.3 fm/c and a short duration of particle emission, Δτ = 0.02 ± 1.5 fm/c. Most strikingly, we find an indication for a hot central part of the hydrodynamically evolving core, characterized by a central temperature of T0 = 202 ± 13 MeV that is close to (or even above) the deconfinement temperature of the quark-hadron phase transition. The best fit indicates a cold surface temperature of Ts = 110 ± 16 MeV. When the possibility of the hot center is excluded, the confidence level of the fit decreases from 28.9% to 1.0%. Predictions are made for the rapidity dependence of the slope parameters and for the transverse mass dependence of the rapidity width of the single-particle spectra, and the transverse mass dependence of the non-identical particle correlations.

Original languageEnglish
Pages (from-to)295-312
Number of pages18
JournalActa Physica Hungarica New Series Heavy Ion Physics
Volume17
Issue number2-4
DOIs
Publication statusPublished - Sep 9 2003

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Keywords

  • Correlations
  • Flow
  • Heavy ion collisions
  • Quark-gluon plasma search

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy(all)

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