Baryon stopping and strange baryon/antibaryon production at SPS energies

Abstract

The amount of proton stopping in central Pb+Pb collisions from 20-160 AGeV as well as hyperon and antihyperon rapidity distributions are calculated within the UrQMD model in comparison to experimental data at 40, 80 and 160 AGeV taken recently from the NA49 collaboration. Furthermore, the amount of baryon stopping at 160 AGeV for Pb+Pb collisions is studied as a function of centrality in comparison to the NA49 data. We find that the strange baryon yield is reasonably described for central collisions, however, the rapidity distributions are somewhat more narrow than the data. Moreover, the experimental antihyperon rapidity distributions at 40, 80 and 160 AGeV are underestimated by up to factors of 3 - depending on the annihilation cross section employed - which might be addressed to missing multi-meson fusion channels in the UrQMD model.

18 pages, including 7 eps figures, to be published in Phys. Rev. C

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• Centrality dependence of proton and antiproton spectra in Pb+Pb collisions at 40A GeV and 158A GeV measured at the CERN SPS
• Alternative Scenarios of Relativistic Heavy-Ion Collisions: I. Baryon Stopping
• Baryon Stopping as a Probe of Deconfinement Onset in Relativistic Heavy-Ion Collisions
• Baryon Stopping in Heavy-Ion Collisions at E_{lab}= 2--160 GeV/nucleon
• Event-by-event viscous hydrodynamics for Cu-Au collisions at 200GeV
• Exploring the potential of antihyperons in nuclei with antiprotons
• Baryon stopping as a signal of the mixed phase onset
• Rapidity losses in heavy-ion collisions from AGS to RHIC energies
• Recent results on strangeness production from NA49
• The yield ratio of anti-nuclei and nuclei of relativistic nuclear collisions in the central rapidity region
• Microscopic study of baryon stopping in low-energy heavy-ion collisions within UrQMD model