Strangeness from 20 AGeV to 158 AGeV

New results from the energy scan programme of NA49, in particular kaon production at 30 AGeV and phi production at 40 and 80 AGeV are presented. The K+/pi+ ratio shows a pronounced maximum at 30 AGeV; the kaon slope para
New results from the energy scan programme of NA49, in particular kaon production at 30 AGeV and phi production at 40 and 80 AGeV are presented. The K+/pi+ ratio shows a pronounced maximum at 30 AGeV; the kaon slope parameters are constant at SPS energies. Both findings support the scenario of a phase transition at about 30 AGeV beam energy. The phi/pi ratio increases smoothly with beam energy, showing an energy dependence similar to K-/pi-. The measured particle yields can be reproduced by a hadron gas model, with chemical freeze-out parameters on a smooth curve in the T-muB plane. The transverse spectra can be understood as resulting from a rapidly expanding, locally equilibrated source. No evidence for an earlier kinetic decoupling of heavy hyperons is found.
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Metadaten
Author:Volker Friese, NA49 Collaboration
URN:urn:nbn:de:hebis:30-16410
Document Type:Preprint
Language:English
Date of Publication (online):2005/09/27
Year of first Publication:2003
Publishing Institution:Univ.-Bibliothek Frankfurt am Main
Release Date:2005/09/27
Note:
Contribution to the proceedings of 'Strangeness in Quark Matter 2003' (March 2003, Atlantic Beach NC, USA)
Source:J.Phys. G30 (2004) , http://arxiv.org/abs/nucl-ex/0305017
HeBIS PPN:188842624
Institutes:Physik
Dewey Decimal Classification:530 Physik
Sammlungen:Universitätspublikationen
Licence (German):License Logo Veröffentlichungsvertrag für Publikationen

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