Fluctuations of particle ratios as a freeze-out probe
| dc.creator | Torrieri, Giorgio | |
| dc.date | 2007-10-01 | |
| dc.date.accessioned | 2026-07-07T11:19:42Z | |
| dc.date.available | 2026-07-07T11:19:42Z | |
| dc.description | We explain how event-by-event fluctuations of particle ratios can constrain and falsify the statistical model of particle production in heavy ion collisions, using $K/π$ fluctuations as an example. We define an observable capable of determining which statistical model, if any, governs freeze-out in ultrarelativistic heavy ion collisions. We calculate this observable for $K/π$ fluctuations, and show that it should be the same for RHIC and LHC energies, as well as independent of centrality, if the Grand-Canonical statistical model is an appropriate description and chemical equilibrium applies. We describe what happens in case of deviations from this scenario, such as light quark chemical non-equilibrium, strange quark over-saturation and local conservation (canonical ensemble) for strange quarks. We also introduce a similar observable capable, together with the published $K^*/K$ measurement, of ascertaining if an interacting hadron gas phase governs the system between thermal and chemical freeze-out, and of ascertaining its duration and impact on hadronic chemistry | |
| dc.description | Proceedings for talk given at Strangeness 2007, Levoca, Slovakia | |
| dc.identifier | https://arxiv.org/abs/0710.0380 | |
| dc.identifier | http://arxiv.org/abs/0710.0380 | |
| dc.identifier | J.Phys.G35:044009,2008 | |
| dc.identifier | doi:10.1088/0954-3899/35/4/044009 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/193772 | |
| dc.subject | Nuclear Theory | |
| dc.title | Fluctuations of particle ratios as a freeze-out probe | |
| dc.type | text |