A statistical model analysis of yields and fluctuations in 200 GeV Au-Au collisions

Giorgio Torrieri, Sangyoung Jeon, Johann Rafelski

Research output: Contribution to journalArticlepeer-review


We show that the simultaneous measurement of yields and fluctuations is capable of falsifying and constraining the statistical hadronization model. We show how such a measurement can test for chemical non-equilibrium, and distinguish between a high temperature chemically equilibrated freeze-out from a supercooled freeze-out with an oversaturated phase space. We perform a fit, and show that both yields and fluctuations measured at RHIC 200 GeV can be accounted for within the second scenario, with both the light and strange quark phase space saturated significantly above detailed balance. We point to the simultaneous fit of the K/π fluctuation and the K*/K- ratio as evidence that the effect of hadronic re-interactions after freeze-out is small.

Original languageEnglish (US)
Pages (from-to)S99-S103
Issue numberSUPPL. 3
StatePublished - 2006


  • Fluctuations
  • Heavy-ion collisions
  • Statistical models

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Instrumentation
  • Safety, Risk, Reliability and Quality
  • Condensed Matter Physics
  • Waste Management and Disposal


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