What can we learn from fluctuations of particle ratios?
- We explain how fluctuations of ratios can constrain and falsify the statistical model of particle production in heavy ion collisions, using K/p 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/p 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 variations of this scaling for 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.
Author: | Giorgio TorrieriORCiD |
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URN: | urn:nbn:de:hebis:30-66450 |
ArXiv Id: | http://arxiv.org/abs/http://arxiv.org/abs/0709.0587v1 |
Parent Title (German): | Proceedings of Science, Talk, Critical Point and the Onset of Deconfinement 2007 |
Document Type: | Article |
Language: | English |
Date of Publication (online): | 2009/05/18 |
Year of first Publication: | 2007 |
Publishing Institution: | Universitätsbibliothek Johann Christian Senckenberg |
Release Date: | 2009/05/18 |
Note: | Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence. |
Source: | http://arxiv.org/abs/0709.0587v1 ; Talk, Critical Point and the Onset of Deconfinement 2007 |
HeBIS-PPN: | 214153789 |
Institutes: | Physik / Physik |
Dewey Decimal Classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
Licence (German): | Creative Commons - Namensnennung-Keine kommerzielle Nutzung-Weitergabe unter gleichen Bedingungen |