Hadronic observables from SIS to SPS energies: anything strange with strangeness?

  • 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.

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Author:H. Weber, Elena L. BratkovskayaORCiDGND, Wolfgang CassingGND, Horst StöckerORCiDGND
Document Type:Preprint
Date of Publication (online):2005/11/15
Year of first Publication:2002
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2005/11/15
Tag:Chiral symmetries; Kernreaktion Modell und Methoden; Meson production; Relativistische Kollisionen des schwere Ions
Chiral symmetries; Meson production; Nuclear-reaction models and methods; Relativistic heavy-ion collisions
Source:Phys.Rev.C67:014904,2003. [nucl-th/0209079]
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):License LogoDeutsches Urheberrecht