Baryon stopping and strange baryon/antibaryon production at SPS energies

  • The amount of proton stopping in central Pb+Pb collisions from 20 160 A·GeV as well as hyperon and antihyperon rapidity distributions are calcu- lated within the UrQMD model in comparison to experimental data at 40, 80 and 160 A·GeV taken recently from the NA49 collaboration. Further- more, the amount of baryon stopping at 160 A·GeV 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 colli- sions, however, the rapidity distributions are somewhat more narrow than the data. Moreover, the experimental antihyperon rapidity distributions at 40, 80 and 160 A·GeV 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. PACS 25.75.+r

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Author:Henning WeberGND, Elena L. BratkovskayaORCiDGND, Horst StöckerORCiDGND
Document Type:Preprint
Date of Publication (online):2005/11/16
Year of first Publication:2002
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2005/11/16
Tag:Relativistic heavy-ion collisions
Version 1 ersch. u.d.T.: Baryon stopping as a probe for highly excited nuclear matter
Source:[nucl-th/0205032v2] (May 2002, last revised 4 Nov 2002) 18 p. Version 2
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):License LogoDeutsches Urheberrecht