Strangeness dynamics and transverse pressure in relativistic nucleus-nucleus collisions

We investigate hadron production as well as transverse hadron spectra from proton-proton, proton-nucleus and nucleus-nucleus collisions from 2 A·GeV to 21.3 A·TeV within two independent transport approaches (HSD and UrQM
We investigate hadron production as well as transverse hadron spectra from proton-proton, proton-nucleus and nucleus-nucleus collisions from 2 A·GeV to 21.3 A·TeV within two independent transport approaches (HSD and UrQMD) that are based on quark, diquark, string and hadronic degrees of freedom. The comparison to experimental data on transverse mass spectra from pp, pA and C+C (or Si+Si) reactions shows the reliability of the transport models for light systems. For central Au+Au (Pb+Pb) collisions at bombarding energies above ~5 A·GeV, furthermore, the measured K± transverse mass spectra have a larger inverse slope parameter than expected from the default calculations. We investigate various scenarios to explore their potential effects on the K± spectra. In particular the initial state Cronin effect is found to play a substantial role at top SPS and RHIC energies. However, the maximum in the K+/..+ ratio at 20 to 30 A·GeV is missed by 40% and the approximately constant slope of the K± spectra at SPS energies is not reproduced either. Our systematic analysis suggests that the additional pressure - as expected from lattice QCD calculations at finite quark chemical potential µq and temperature T- should be generated by strong interactions in the early pre-hadronic/partonic phase of central Au+Au (Pb+Pb) collisions.
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Metadaten
Author:Sven Soff, Elena L. Bratkovskaya, Marcus Bleicher, Manuel Reiter, Horst Stöcker, Marco van Leeuwen, Steffen A. Bass, Wolfgang Cassing
URN:urn:nbn:de:hebis:30-6723
DOI:http://dx.doi.org/10.1103/PhysRevC.69.054907
ISSN:2469-9993
ISSN:1089-490X
ISSN:2469-9985
ISSN:0556-2813
Parent Title (English):Physical review. C
Publisher:American Physical Society
Place of publication:Woodbury, NY
Document Type:Article
Language:English
Date of Publication (online):2005/04/13
Year of first Publication:2004
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2005/04/13
Volume:69
Issue:5, Art. 054907
Pagenumber:19
First Page:1
Last Page:19
Note:
©2004 The American Physical Society
Source:Arxiv nucl-th/0402026
HeBIS PPN:128748435
Institutes:Physik
Helmholtz International Center for FAIR
Frankfurt Institute for Advanced Studies (FIAS)
Dewey Decimal Classification:530 Physik
Sammlungen:Universitätspublikationen
Licence (German):License Logo Veröffentlichungsvertrag für Publikationen

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