Energy Dependence of $Λ$ and $\barΛ$ Production at CERN-SPS Energies

Details Energy Dependence of $Λ$ and $\barΛ$ Production at CERN-SPS Energies Energy Dependence of $Λ$ and $\barΛ$ Production at CERN-SPS Energies

2002-09-04

arxiv.org/abs/nucl-ex/0209002v1

Nucl.Phys. A715 (2003) 453-457

Physics

Nuclear Physics

Nuclear Experiment

6 pages, 9 figures, QM2002 proceedings, submitted to Nucl. Phys. A

Scientific paper

Rapidity distributions for $\Lambda$ and $\bar{\Lambda}$ hyperons in central Pb-Pb collisions at 40, 80 and 158 A$\cdot$GeV and for ${\rm K}_{s}^{0}$ mesons at 158 A$\cdot$GeV are presented. The lambda multiplicities are studied as a function of collision energy together with AGS and RHIC measurements and compared to model predictions. A different energy dependence of the $\Lambda/\pi$ and $\bar{\Lambda}/\pi$ is observed. The $\bar{\Lambda}/\Lambda$ ratio shows a steep increase with collision energy. Evidence for a $\bar{\Lambda}/\bar{\rm p}$ ratio greater than 1 is found at 40 A$\cdot$GeV.

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