Equation of state for the two component Van der Waals gas with relativistic excluded volumes
- A canonical partition function for the two-component excluded volume model is derived, leading to two di erent van der Waals approximations. The one is known as the Lorentz-Berthelot mixture and the other has been proposed recently. Both models are analysed in the canonical and grand canonical ensemble. In comparison with the one-component van der Waals excluded volume model the suppression of particle densities is reduced in these two-component formulations, but in two essentially di erent ways. Presently used multi-component models have no such reduction. They are shown to be not correct when used for components with di erent hard-core radii. For high temperatures the excluded volume interaction is refined by accounting for the Lorentz contraction of the spherical excluded volumes, which leads to a distinct enhancement of lighter particles. The resulting e ects on pion yield ratios are studied for AGS and SPS data.
Author: | Gebhard ZeebGND, Kyrill A. BugaevORCiD, Philipp Tim ReuterGND, Horst StöckerORCiDGND |
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URN: | urn:nbn:de:hebis:30-21150 |
Document Type: | Preprint |
Language: | English |
Date of Publication (online): | 2005/11/15 |
Year of first Publication: | 2002 |
Publishing Institution: | Universitätsbibliothek Johann Christian Senckenberg |
Release Date: | 2005/11/15 |
Tag: | Equation of State; Relativistic Excluded Volumes; Two-component and Multi-component Hadron Gas; Van der Waals Excluded Volume Model |
HeBIS-PPN: | [nucl-th/0209011] |
HeBIS-PPN: | 18574611X |
Institutes: | Physik / Physik |
Dewey Decimal Classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
Licence (German): | Deutsches Urheberrecht |