NUKLEONIKA 2006, 51(Suppl. 3):s99-s103
Giorgio Torrieri1, Sangyoung Jeon1,2, Johann Rafelski3
1 Department of Physics, McGill University, Montréal, QC H3A-2T8, Canada
2 RIKEN-BNL Research Center, Upton NY, 11973, USA
3 Department of Physics, University of Arizona, Tucson AZ 85721, USA
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 over-saturated 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/p fluctuation and the
K*/K-
ratio as evidence that the effect of hadronic re-interactions after freeze-out is small.