TY  - INPR
A1  - Weber, H.
A1  - Bratkovskaya, Elena L.
A1  - Cassing, Wolfgang
A1  - Stöcker, Horst
T1  - Hadronic observables from SIS to SPS energies: anything strange with strangeness?
N2  - We calculate p, ±,K± and (+ 0) rapidity distributions and compare to experimental data from SIS to SPS energies within the UrQMD and HSD transport approaches that are both based on string, quark, diquark (q, ¯q, qq, ¯q ¯q) and hadronic degrees of freedom. The two transport models do not include any explicit phase transition to a quark-gluon plasma (QGP). It is found that both approaches agree rather well with each other and with the experimental rapidity distributions for protons, s, ± and K±. In- spite of this apparent agreement both transport models fail to reproduce the maximum in the excitation function for the ratio K+/ + found experimen- tally between 11 and 40 A·GeV. A comparison to the various experimental data shows that this failure is dominantly due to an insu cient description of pion rapidity distributions rather than missing strangeness . The modest di erences in the transport model results on the other hand can be attributed to di erent implementations of string formation and frag- mentation, that are not su ciently controlled by experimental data for the elementary reactions in vacuum.
KW  - Kernreaktion Modell und Methoden
KW  - Relativistische Kollisionen des schwere Ions
KW  - Chiral symmetries
KW  - Meson production
KW  - Nuclear-reaction models and methods
KW  - Relativistic heavy-ion collisions
KW  - Chiral symmetries
KW  - Meson production
Y1  - 2002
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/3289
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30-21176
ER  -