TY  - INPR
A1  - Zeeb, Gebhard
A1  - Bugaev, Kyrill A.
A1  - Reuter, Philipp Tim
A1  - Stöcker, Horst
T1  - Equation of state for the two component Van der Waals gas with relativistic excluded volumes
N2  - 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.
KW  - Two-component and Multi-component Hadron Gas
KW  - Equation of State
KW  - Van der Waals Excluded Volume Model
KW  - Relativistic Excluded Volumes
Y1  - 2002
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/3290
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30-21150
ER  -