Extracting the strangeness freeze-out temperature from net-Kaon data at RHIC

Rene Bellwied, Jacquelyn Noronha-Hostler, Paolo Parotto, Israel Portillo Vazquez, Claudia Ratti, Jamie Stafford

Research output: Contribution to journalConference articlepeer-review


Using the moments of the net-kaon distribution calculated within a state of-the-art hadron resonance gas model compared to experimental data from STAR’s Beam Energy Scan, we find that the extracted strange freeze-out temperature is incompatible with the light one extracted from net-proton and net-charge fluctuations. Additionally predictions for net-Lambda fluctuations are made that also appear to be consistent with a higher freeze-out temperature for strange particles. This strangeness freeze-out temperature is roughly 10 − 15 MeV higher than the corresponding light freeze-out temperature. We also discuss cross-susceptibilities using different identified particles, which may be a further test of this two freeze-out temperature picture. Finally, we lay out the necessary updates needed in relativistic hydrodynamic models to take into account for this two freeze-out temperature scenario and present preliminary results of Λ spectra at RHIC for AuAu √sNN = 200 GeV collisions that indicate a higher freeze-out temperature is preferred.

Original languageEnglish (US)
JournalProceedings of Science
StatePublished - Sep 19 2019
Externally publishedYes
Event2018 Corfu Summer Institute "School and Workshops on Elementary Particle Physics and Gravity", CORFU 2018 - Corfu, Greece
Duration: Aug 31 2018Sep 28 2018

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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