TY  - INPR
A1  - Bratkovskaya, Elena L.
A1  - Bleicher, Marcus
A1  - Dumitru, Adrian Bogdan
A1  - Paech, Kerstin
A1  - Reiter, Manuel
A1  - Soff, Sven
A1  - Stöcker, Horst
A1  - Weber, Henning
A1  - Leeuwen, Marco van
A1  - Cassing, Wolfgang
T1  - Review of QGP signatures - ideas versus observables
T2  - Invited talk presented by H. Stöcker at the International Conference of the NATO Advanced Study Institute 'Structure and Dynamics of Elementary Matter', Kemer, Turkey, 22 Sep.-20 Okt. 2003 (references corrected in the new version)
N2  - We investigate hadron production and transverse hadron spectra in nucleus-nucleus collisions from 2 A·GeV to 21.3 A·TeV within two independent transport approaches (UrQMD and HSD) based on quark, diquark, string and hadronic degrees of freedom. The enhancement of pion production in central Au+Au (Pb+Pb) collisions relative to scaled pp collisions (the ’kink’) is described well by both approaches without involving a phase transition. However, the maximum in the K+ p+ ratio at 20 to 30 A·GeV (the ’horn’) is missed by ~ 40%. Also, at energies above ~5 A·GeV, the measured K± mT-spectra have a larger inverse slope than expected from the models. Thus the pressure generated by hadronic interactions in the transport models at high energies is too low. This finding suggests that the additional pressure - as expected from lattice QCD at finite quark chemical potential and temperature - might be generated by strong interactions in the early pre-hadronic/partonic phase of central heavy-ion collisions. Finally, we discuss the emergence of density perturbations in a first-order phase transition and why they might affect relative hadron multiplicities, collective flow, and hadron mean-free paths at decoupling. A minimum in the collective flow v2 excitation function was discovered experimentally at 40 A·GeV - such a behavior has been predicted long ago as signature for a first order phase transition.
Y1  - 2004
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/4832
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30-6708
ER  -