Nucleus-nucleus collisions at high baryon densities

Details Nucleus-nucleus collisions at high baryon densities Nucleus-nucleus collisions at high baryon densities

2002-05-10

arxiv.org/abs/nucl-th/0205030v2

Phys.Lett. B545 (2002) 285-290

Physics

Nuclear Physics

Nuclear Theory

9 pages, including 3 eps figures, submitted to Phys. Lett. B

Scientific paper

10.1016/S0370-2693(02)02623-0

We study central collision of Pb+Pb at 20, 40, 80 and 160 AGeV within the UrQMD transport approach and compare rapidity distributions of pi-, K+, K- and Lambda with the recent measurements from the NA49 Collaboration at 40, 80 and 160 AGeV. It is found that the UrQMD model reasonably describes the data, however, systematically overpredicts the pi- yield by about 20%, whereas the K+ yield is underestimated by about 15%. The K- yields are in a good agreement with the experimental data, the Lambda yields are also in a reasonable correspondence with the data for all energies. We find that hadronic flavour exchange reactions largely distort the information about the initial strangeness production mechanism at all energies considered.

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