Journal article

Publication year: 2003

Journal: Physical Review C

Volume number: 67

Issue number: 1

ISSN: 0556-2813

eISSN: 1089-490X

DOI Link: https://doi.org/10.1103/PhysRevC.67.014904

Publisher: American Physical Society

Abstract: 
We calculate p, pi(+/-), K+/-, and Lambda(+Sigma(0)) rapidity distributions and compare to experimental data from SIS to SPS energies within the Ultrarelativistic-Quantum-Molecular Dynamics and Hadron-String Dynamics transport approaches that are both based on string, quark, diquark (q, (q) over bar, qq, (q) over bar(q) over bar), and hadronic degrees of freedom. The two transport models do not include any explicit phase transition to a quark-gluon plasma. It is found that both approaches agree rather well with each other and with the experimental rapidity distributions for protons, Lambda's, pi(+/-), and K+/-. In spite of this apparent agreement both transport models fail to reproduce the maximum in the excitation function for the ratio K+/pi(+) found experimentally between 11 and 40 A GeV. A comparison to the various experimental data shows that this "failure" is dominantly due to an insufficient description of pion rapidity distributions rather than missing "strangeness." The modest differences in the transport model results-on the other hand-can be attributed to different implementations of string formation and fragmentation that are not sufficiently controlled by experimental data for the "elementary" reactions in vacuum.

Harvard Citation style: Weber, H., Bratkovskaya, E., Cassing, W. and Stöcker, H. (2003) Hadronic observables at relativistic energies:: Anything strange with strangeness? -: art. no. 014904, PHYSICAL REVIEW C, 67(1), Article 014904. https://doi.org/10.1103/PhysRevC.67.014904

APA Citation style: Weber, H., Bratkovskaya, E., Cassing, W., & Stöcker, H. (2003). Hadronic observables at relativistic energies:: Anything strange with strangeness? -: art. no. 014904. PHYSICAL REVIEW C. 67(1), Article 014904. https://doi.org/10.1103/PhysRevC.67.014904