TY - JOUR A1 - Soff, Sven A1 - Bratkovskaya, Elena L. A1 - Bleicher, Marcus A1 - Reiter, Manuel A1 - Stöcker, Horst A1 - Leeuwen, Marco van A1 - Bass, Steffen A. A1 - Cassing, Wolfgang T1 - Strangeness dynamics and transverse pressure in relativistic nucleus-nucleus collisions T2 - Physical review. C N2 - 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. Y1 - 2005 UR - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/4831 UR - https://nbn-resolving.org/urn:nbn:de:hebis:30-6723 SN - 2469-9993 SN - 1089-490X SN - 2469-9985 SN - 0556-2813 N1 - ©2004 The American Physical Society VL - 69 IS - 5, Art. 054907 SP - 1 EP - 19 PB - American Physical Society CY - Woodbury, NY ER -