CERN Accelerating science

Article
Report number	hep-ex/0311010
Title	Strangeness Production in Heavy Ion Collisions at SPS Energies
Related title	super proton synchrotron
Author(s)	Mischke, Andre (Darmstadt, GSI)
Publication	2004
Imprint	5 Nov 2003
Number of pages	3
In:	Eur. Phys. J. C 33 (2004) s621-s623
In:	EPS International Europhysics Conference on High-Energy Physics, Aachen, Germany, 17 - 23 Jul 2003, pp.s621-s623
DOI	10.1140/epjcd/s2004-03-1721-1
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN SPS ; NA49
Abstract	The NA49 collaboration has taken data of central Pb-Pb collisions at beam energies from 20 to 158 GeV per nucleon. The large acceptance of the detector allows to study particle yields in full phase space. In this paper we present recent results on strangeness production (K, $\Lambda$ and $\phi$) in this energy range and compare to measurements at lower and higher energies. The K$^+/\pi^+$ and $\Lambda/\pi$ ratio shows a pronounced maximum around 30 A$\cdot$GeV, whereas the K$^-/\pi^-$ and $\bar{\Lambda}/\pi$ ratio exhibits a continuous rise. The $\phi/\pi$ ratio also increases monotonically with beam energy. First results on multi-strange hyperon production at lower SPS energies are presented.

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