Baryon stopping and charged particle distributions in central Pb+Pb collisions at 158 GeV per nucleon

  • Net proton and negative hadron spectra for central \PbPb collisions at 158 GeV per nucleon at the CERN SPS were measured and compared to spectra from lighter systems. Net baryon distributions were derived from those of net protons, utilizing model calculations of isospin contributions as well as data and model calculations of strange baryon distributions. Stopping (rapidity shift with respect to the beam) and mean transverse momentum \meanpt of net baryons increase with system size. The rapidity density of negative hadrons scales with the number of participant nucleons for nuclear collisions, whereas their \meanpt is independent of system size. The \meanpt dependence upon particle mass and system size is consistent with larger transverse flow velocity at midrapidity for \PbPb compared to \SS central collisions.

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Author:Harald AppelshäuserGND, NA49 Collaboration
ArXiv Id:
Document Type:Preprint
Date of Publication (online):2005/09/29
Year of first Publication:1999
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2005/09/29
Source:Phys.Rev.Lett. 82 (1999),
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
PACS-Classification:20.00.00 NUCLEAR PHYSICS / 25.00.00 Nuclear reactions: specific reactions / 25.75.-q Relativistic heavy-ion collisions (collisions induced by light ions studied to calibrate relativistic heavy-ion collisions should be classified under both 25.75.-q and sections 13 or 25 appropriate to the light ions) / 25.75.Dw Particle and resonance production
Licence (German):License LogoDeutsches Urheberrecht