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Hyperon resonances are becoming an extremely useful tool allowing the studyof the properties of hadronic fireballs made in heavy ion collisions. Theiryield, compared to stable particles with the same quark composition, depends onhadronization conditions. The resonance's short lifetime makes them idealprobes of the fireball chemical freeze-out mechanisms. An analysis of resonanceabundance in heavy ion collisions should be capable of distinguishing betweenpossible hadronization scenarios, in particular between sudden and gradualhadronization. In this paper, we review the existing SPS and RHIC experimentaldata on resonance production in heavy ion collisions, and discuss in terms ofboth thermal and microscopic models the yields of the two observed resonances,K* and Lambda(1520). We show how freeze-out properties, namely chemicalfreeze-out temperature and the lifetime of the interacting hadron phase whichfollows, can be related to resonance yields. Finally, we apply these methods toSPS and RHIC measurements, discuss the significance and interpretations of ourfindings, and suggest further measurements which may help in clarifyingexisting ambiguities.Comment: To appear in the proceedings of Pan American Advanced Studies  Institute on New States of Matter in Hadronic Interactions (PASI 2002),  Campos do Jordao, Brazil, 7-18 Jan 2002; American Institute of Physics 2002.  v2: reference and language correctio

Strange Hadron Resonances: Freeze-Out Probes in Heavy-Ion Collisions